The Official ASE Study Guide

ASE School Bus Tests

ASE School BuS TESTS

Overview ................................................................................................ 38

School Bus Tests ................................................................................... 943 BodySystemsandSpecialEquipment(TestS1) ............................9 DieselEngines(TestS2) ...............................................................13 DriveTrain(TestS3) .....................................................................20 Brakes(TestS4) ............................................................................25 SuspensionandSteering(TestS5) ................................................30 Electrical/ElectronicSystems(TestS6) ........................................35 AirConditioningSystemsandControls(TestS7) ........................40

Industry Training ............................................................................... 4447

Table of Contents

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IntroductionTheOfficial ASE Study Guide for the School Bus Testsisintendedtohelptechni-ciansstudyfortheASEcertificationtests.Thespecificmaterialabouteachtest,includedinthebookletisausefultoolforreviewingthetechnicalknowledgethatiscoveredintheSchool Bus tests.Afterperformingathoroughreview,itshouldbeeasiertoselectadditionalreferencematerialthatwillassistyouwiththetestpreparationneeds. ASEvoluntarycertificationisameansbywhichtechnicianscanprovetheirabilitiestothemselves,totheiremployers,andtotheircustomers.BypassingASEtestsyouwillearnthemostvaluablecredentialavailabletoschoolbustechnicians.Becausethetestsaretough,youllhavethesatisfactionofprovingtoyourselfthatyouareamongtheeliteinyourprofession.Whatsmore,thesecredentialsarerecognizedthroughoutthenation. Certifiedtechnicianspromotecustomertrustandimprovetheimageoftheindustry.Andtrustandprofessionalismarethefirststepstoabetter,morepros-perousbusiness. ASEencouragesyoutotakethetestsandtojointheprovenproswhoweartheASEBlueSealofExcellence.

How Do I Become Certified?TherearecurrentlyseventestsintheSchoolBusTechniciancertificationseries.Ifyoupassoneormoretests,andhaveatleasttwoyearsofhands-onworkingexperienceinschoolbusrepair,thenyouwillbecomecertifiedasanASESchoolBusTechnician.(Appropriatevocationaltrainingmaybesubstitutedforuptooneyearofworkexperience.) IfyoupasstestsS1throughS6,andmeettheexperiencerequirement,youwillearnthecertificateofMasterSchoolBusTechnician. IfyouarecurrentlycertifiedinDieselEngines(A9,H2,S2,orT2) andElectrical/ElectronicSystems(A6,H6,S6,orT6),youareeligibletotaketheL2ElectronicDieselEngineDiagnosisSpecialisttest. Ifyoufailatest,youmaytakeitagainduringanyscheduledtestadmin-istrationinwhichitisoffered.Andremember,youaretheonlyonewhowillreceiveyourtestsscores;resultswillnotbegivenoverthephonenorwilltheybereleasedtoanyonewithoutyourwrittenpermission.

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School Bus TestsASEtestsandcertifiestechniciansinthefollowingSchoolBusareas: Body Systems and Special Equipment (Test S1) DieselEngines(TestS2) DriveTrain(TestS3) Brakes(TestS4) SuspensionandSteering(TestS5) Electrical/ElectronicSystems(TestS6) AirConditioningSystemsandControls(TestS7)

ASEalsoofferscertificationinAutomobile,Medium/HeavyTruck, TruckEquipment,CollisionRepair/Refinish,TransitBus,Parts SpecialistandAdvancedLevelspecialties.SeparateStudy Guidesareavailableforeachtestseries. ForfullinformationonASEtestingaswellasdownloadableStudy Guides,Registration Booklets,andmore,visitwww.ase.com.YoumayalsorequestRegistration BookletsbymailingthecouponlocatedonthebackcoverofthisbookletorbycallingASEat703-669-6600,ext.400.

Who Writes the Questions?Thequestions,writtenbyserviceindustryexpertsfamiliarwithallaspectsofschoolbusrepair,areentirelyjob-related.Theyaredesignedtotestknowledgeoftheskillsthatyouneedinservicingschoolbuses;theoreticalknowledgeisnotcovered. EachquestionhasitsrootsinanASEitem-writingworkshopwhereservicerepresentativesfromschoolbusmanufacturers,aftermarketpartsandequipmentmanufacturers,workingtechniciansandtechnicaleducatorsmeetinaworkshopsettingtoshareideasandtranslatethemintotestquestions.Eachtestquestionwrittenbytheseexpertsmustsurvivereviewbyallmembersofthegroup.Thequestionsarewrittentodealwithpracticalproblemsofdiagnosisandrepairexperiencedbytechniciansintheirday-to-daywork. Fromthere,allquestionsarepre-testedandquality-checkedonanationalsampleoftechnicians.ThosequestionsthatmeetASEstandardsofqualityandaccuracyareincludedinthescoredsectionsofthetests;therejectsaresentbacktothedrawingboardordiscardedaltogether. Eachcertificationtestismadeupofbetween45and55multiple-choicequestions.Thetestingsessionsare4hoursand15minutes,allowingplenty oftimetocompleteseveraltests.

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Note: Eachtestcouldcontainuptofifteenadditionalquestionsthatareincludedforstatisticalresearchpurposesonly.Youranswerstothesequestionswillnotaffectyourscore,butsinceyoudonotknowwhichonestheyare,youshouldanswerallquestionsinthetest.

How Do I Prepare for the ASE Tests?Becomefamiliarwithtestcontentandquestionformat:TheTestSpecificationsinthisbookletcontainasummarydescriptionofthecontentcoveredbyeachtest.TheTaskListsdescribetheactualworkperformedbytechniciansineachspecialtyarea.Together,theseformablueprintforwritingandassemblingtheASEtests.Pleasenotethateachquestiononthetestiskeyed,orlinked,toaparticulartaskorsetoftasksinthetasklist.Therefore,areviewofthetasklists,withaneyetojudgingwhetheryouknowhowtoperformeachtasklisted,willprovideyouvaluableinformationasyouprepareforthetests. Therearefivetypesofmultiple-choicequestionsonthetests,eachofwhichisincludedinthesamplequestionsinthisbooklet.Notethedifferentinstructionsforsomequestions. Besuretoreadeachquestioncarefully,(twice,ifnecessary)sothatyouunderstandexactlywhatisbeingasked.Each question tests a specific diagnostic or repair problem and has only one correct answer. Tosummarize,wesuggestthefollowingstepsbetakentoprepareforthetests: Step 1. Studythecontentlistforeachtestyouwillattempt. Step2. Carefullyreadthetasklistforeacharea. Step3. Gooverthesamplequestionstobecomefamiliarwitheach questiontype.Thisisveryimportant. Step4. Reviewsteps1through3andidentifytheskillarea(s)where youneedadditionalstudy.

Types of Knowledge Measured By the TestsThetypesofknowledgeandskillsyouwillneedtoknowtopassthetestsareasfollows: Basictechnicalknowledge:Testsyourknowledgeofwhatisinasystemand

howthesystemworks,andwhataretheproperproceduresandprecautionstobefollowedinmakingrepairsandadjustments.

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Serviceorrepairknowledgeandskill:Testsyourunderstandingandabilitytoapplygenerallyacceptedrepairproceduresandprecautionsinassembly,disassembly,andreconditioningoperations;andinmakinginspectionsandadjustments.Alsotestsabilitytouseshopmanualsandprecisiontoolsofthetrade.

Testinganddiagnosticknowledgeandskill:Testsyourabilitytorecognizeproblemsandtousegenerallyavailablemeasurementandtestingequipmenttomakeadiagnosis.Alsotestsyourabilitytotracetheeffectsofaparticularconditionandfindthecauseofaparticularsetofsymptoms.

Ifyouareanexperiencedandcompetenttechnician,acarefulreviewofthisbooklet,andadditionalbrush-uponthoseareasinwhichyouareweakest,isallyoushouldneedtopasstheASEtests.

Before The TestsTrytobewell-restedforthetestsoyouwillbealertandefficient.Ifyouaretak-ingthewrittenversions,pleasebringseveralsharpenedsoft-lead(#2)pencilsandaneraserwithyou;pencilswillnotbefurnishedatthetestcenter.Ifyouwishtopaceyourself,bringawatch;sometestingroomsmaynothaveclocks.Finally,besuretobringalongyourtestcenteradmissionticketandacurrentphotoI.D.

At the Test CenterSome TipsArriveearlyenoughtofindthebuildingandtestingroom.Whenyoureachthelocation,waitintheassignedareauntiltheproctorbeginsthetestadministration.Heorshewillinstructyouinfillingouttheanswerbooklet(iftakingwrittentests)orloggingontothecomputer(iftakingcomputer-basedtests). Oncetestinghasbegun,keeptrackoftime.Donotspendtoolongonanysinglequestion.Besuretoreadeachquestioncarefullysothatyouunderstandexactlywhatisbeingasked.Donotmarkanswersinthetestbooklet;theymustbemarkedontheanswerbooklet.Yourtestwillnotbescoredifyouranswersarenotonyouranswerbooklet. Ifaquestionisdifficult,marktheanswerthatyouthinkiscorrectandputacheckbyitinthetestbook.(Computer-basedtestsallowyoutodothisonscreen.)Thengoontothenextquestion.Ifyoufinishbeforetimeisup,youmaygobacktothequestionsthatyouchecked. Itistoyouradvantagetoanswereveryquestion.Donotleaveany answersblank.Yourscorewillbebasedonlyonthenumberofcorrect answersthatyougive.

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Test Content and Sample QuestionsThefollowingmaterialisdesignedtohelptechnicianspreparefortheASE certificationtests. EachsectionbeginswiththeTestSpecifications,whichwilllistthemaincategoriescoveredonthatparticulartestandthenumberoftestquestionsandpercentageofthetestdevotedtoeachtopic. TheTaskListdescribestheworkactivitiesatechnicianshouldbeabletoperformineachtechnicalareacoveredonthattest.Thislistwasdevelopedbyworkingtechniciansandtechnicalexpertsfromacrossthecountryandwillpro-videavaluablechecklistofwhattostudyforthetest. Thesetaskdescriptionsofferdetailedinformationtotechnicianspreparingforthetestandtopersonswhomaybeinstructingtechnicians.Thetasklistsmayalsoserveasguidelinesforquestionwriters,reviewers,andtestassemblers. Itshouldalsobenotedthatthenumberofquestionsineachcontentareamaynotequalthenumberoftaskslisted.Someofthetasksarecomplexandbroadinscopeandmaybecoveredbyseveralquestions.Othertasksaresimpleandnarrowinscopeandonequestionmaycoverseveraltasks.Themainobjectiveinlistingthetasksistodescribeaccuratelywhatisdoneonthejob,nottomakeeachtaskcorrespondtoaparticulartestquestion. Samplequestionsfollow.Althoughthesesamequestionswillnotappearonactualtests,theyareinthesameformatasactualtestquestions.Allfivetypesofmultiple-choicequestionsusedontheASEtestsarerepresentedhere.Notethedifferentinstructionsforsomequestions.

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School Bus Types Found on ASE Certification TestsTheTypeAschoolbusisaconversionorbodyconstructeduponavan-type orcutawayfront-sectionvehiclewithaleft-sidedriversdoor,designedforcarryingmorethan10personswithagrossvehicleweightrating(GVWR)of10,000poundsorless.The Type Bschoolbusisaconversionorbodyconstructedandinstalleduponafront-sectionvehiclechassis,orstrippedchassis,withagrossvehicleweightrating(GVWR)ofmorethan10,000pounds,designedforcarryingmorethan10persons.Partoftheengineisbeneathand/orbehindthewindshieldandbesidethedriversseat.Theentrancedoorisbehindthefrontwheels.TheTypeCschoolbusisabodyinstalleduponaflat-backcowlchassiswithagrossvehicleweightrating(GVWR)ofmorethan10,000pounds,designedforcarryingmorethan10persons.Theentireengineisinfrontofthewindshieldandtheentrancedoorisbehindthefrontwheels.TheTypeDschoolbusisabodyinstalleduponachassis,withtheenginemountedinthefront,midship,orrearwithagrossvehicleweightrating(GVWR)ofmorethan10,000pounds,anddesignedforcarryingmorethan 10persons.Theenginemaybebehindthewindshieldandbesidethedriversseat;itmaybeattherearofthebus,behindtherearwheels.Theentrancedoor isaheadofthefrontwheels.

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TEST SpEcificATionS And TASk liSTBody SySTEmS And SpEciAl EquipmEnT (TEST S1)

Content Questions Percentage Area in Test of Test A. Safety and Emergency Equipment Systems Diagnosis and Repair 10 20% B. Body and Interior Maintenance 14 28% C. Installed Special Equipment Diagnosis and Repair 10 20% D. Heating Systems Diagnosis and Repair 16 32%

Total 50 100%

A. Safety and Emergency Equipment Systems Diagnosis and Repair (10 questions) 1. Inspectsafetyequipmentconditionandsecurity;serviceorreplaceasrequired

(fireextinguisher,firstaidkit,bodyfluidcleanupkit,reflectivetriangles,seatbeltcutter,etc.).

2. Checkconditionandoperationofseatbelts/tetherbelts,retractor,latchanddriver/passengerrestraintsystems;repairorreplaceasrequired.

3. Inspect,adjust,lubricate,repairorreplaceemergencyexits,doors,hatches,hold-opendevices,latches,hinges,handles,decals,andseals.

4. Checkoperationofstoparm(s)andcrossinggate(air-operated,vacuum,orelectric)warningdevices;serviceorreplaceasneeded.

5. Inspect,test,adjust,repairorreplaceelectricalcomponentsintheemergencyexitwarningsystems(roofhatches,push-outwindows,doors,etc.).

6. Inspect,test,andreplacereflectors,reflectivematerials,andlettering.

B. Body and Interior Maintenance (14 questions) 1. Inspectupholstery,foam,seatframe,andmountinghardwareofpassengerseats

(includingtrack,flip,childseats,etc.);repairorreplaceasrequired. 2. Inspect,diagnose,test,adjust,repairorreplaceupholstery,foam,seatframe(airand

manual,etc.)andmountinghardwarefordriversseat. 3. Inspectfloor,floorcovering,stepwell,wheelhouse,andmoldings;repairorreplace

asneeded. 4. Inspect,adjust,repairorreplaceentrydoors,liftdoors,andhandrails. 5. Checkmirrorsforclarity,mountingsecurity,andcondition;repairorreplaceas

required. 6. Inspect,adjust,repairorreplacebodymountingbolts,clips(tiedowns),outriggers,

shearbolts,crossmembers(floorsills),cowlmounts,andaccessorycompartments(battery,luggage)inaccordancewithmanufacturersrecommendedprocedures.

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7. Inspectchassisframeforcracks,breaks,distortion,looseness,anddamage;determineneededrepairs.

8. Checkalignmentandsecurityofenginecoverandseals;adjust,service,repairorreplaceasrequired.

9. Inspect,test,adjust,repairorreplacemanual,electric,orair-operatedentrydoorcontrolsincludingtheemergencyreleasesystems.

10. Inspectwindshield,windowglass,frame,sashandlatches;repairorreplaceas necessary.

C. Installed Special Equipment Diagnosis and Repair (10 questions) 1. Checkoperationofwheelchairliftsystemscontrols(electrical,hydraulic,ormechan-

ical)andbackupsystems;adjust,repairorreplaceasneeded. 2. Inspectstructuralintegrityofwheelchairliftplatform,mountingdevices,handrails,

andsafetybarriers;repairorreplaceaccordingtomanufacturersrecommendations. 3. Inspectconditionandsecurityofwheelchairtrackandtiedowns,andwheelchair

passengerseatbelt(restraint)systems.

D. Heating Systems Diagnosis and Repair (16 questions) 1. Diagnosethecauseoftemperaturecontrolproblemsintheheating/ventilating/

defrostingsystem;determineneededrepairs. 2. Diagnosewindowfoggingproblems;determineneededrepairs. 3. Performcoolingsystemtests,includingfreezeprotection;determineneededrepairs. 4. Inspect,test,andreplaceheatercoolantcontrolvalve(manual,vacuum,and

electricaltypes). 5. Inspect,flush,andreplaceheatercore,hoses,clamps,andcovers;bleedthesystem. 6. Performheatingsystemteststoincludecorrectflow,boosterpumpoperation,and

restrictors. 7. Checkconditionofheaterfiltersandexteriorofheatercore;cleanorreplace

accordingtomanufacturersrecommendations. 8. Inspect,diagnose,test,repair,andreplaceheater/defrosterblowersanddefogger

fans,resistors,switches,relay/modules,sensors,wiring,connectors,andprotectiondevices.

9. Inspect,diagnose,test,service,orreplaceheating,ventilating,anddefrostingcontrolpanelassemblies,cables,andlinkages.

10. Inspect,diagnose,test,andreplaceheating,ventilating,anddefrostingsystemvacuumcontrolswitchesandhoses,diaphragms,vacuumpumps,vacuumreservoir,checkvalves,anddrivebelts.

11. Inspect,test,adjust,repair,orreplaceheating/ventilating/defrostingducts,doors,hoses,andoutlets.

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quESTionS:

1. Anair-operatedstoparmwillnotfullyextend.Whichoftheseisthemostlikelycause?

*(A)Lowairpressure (B)Bindinghingepivots (C)Astickingsolenoidvalve (D)Abrokenreturnspringpivot

2. Areplacementstudentwindowsideglassshould: (A)betempered. *(B)meetFMVSSrequirements. (C)belaminated. (D)bereplacedbyaglasscompany.

3. Whichoftheseisthebestlocationforaschoolbusfirstaidkit? (A)Thefloorbythestepwell (B)Ontherearemergencydoor (C)Inthetoolbox *(D)Inthedriversarea

4. TechnicianAsaysthatthepHlevelshouldbecheckedduringacoolanttest.TechnicianBsaysthatthefreezepointshouldbecheckedduringacoolanttest.Whoisright?

(A)Aonly *(C)BothAandB (B)Bonly (D)NeitherAnorB

5. Afterabrokenheaterhoseisrepaired,therightsideofthewindshieldwillnotdefrost.Themostlikelycauseis:

(A)thesystemwasoverfilled. *(B)airistrappedinthesystem. (C)thereplacementcoolantwasimproperlymixed. (D)theheaterfilterwasinstalledbackwards.

SAmplE quESTionSBody SySTEmS And SpEciAl EquipmEnT (TEST S1)

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6. OnatypeCschoolbus,thedefrosterblowerworksonlowandmediumspeed,butnotonthehighspeed.Themostlikelycauseisa:

(A)badcircuitbreaker. *(B)badcontrolswitch. (C)looseground. (D)cloggedheaterfilter. Question 7 is not like the ones above. IthasthewordEXCEPT.Forthisquestion,lookforthechoicethatcould

NOTcausethedescribedsituation.Readtheentirequestioncarefullybeforechoosingyouranswer.

7. Awheelchairlifthasadrifting/leakdownproblem.AllofthesecouldbethecauseEXCEPT:

(A)anopenmanualvalve. *(B)lowfluidlevel. (C)abadseal. (D)abadhydraulicpump.

S1 SAmplE quESTionS (conTinuEd)

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TEST SpEcificATionS And TASk liSTdiESEl EnginES (TEST S2)

Content Questions Percentage Area in Test of Test A. General Engine Diagnosis 15 27% B. In-Chassis Engine Inspection and Repair 6 11% C. Lubrication and Cooling Systems Diagnosis and Repair 7 13% D. Air Induction and Exhaust Systems Diagnosis and Repair 9 16% E. Fuel System Diagnosis and Repair 15 27% F. Starting System Diagnosis and Repair 3 6%

Total 55 100%

A. General Engine Diagnosis (15 questions) 1. Verifythecomplaint,androadtestvehicle;reviewpastmaintenancedocuments

(ifavailable);checkfortechnicalservicebulletins(TSBs),determinefurther diagnosis.

2. Inspectengineassemblyandcompartmentforfuel,oil,coolant,andotherleaks;determineneededrepairs.

3. Isolateanddiagnoseenginenoises;determineneededrepairs. 4. Checkengineexhaustodor,smokecolor,density(opacity)andquantity;determine

neededrepairs. 5. Performfuelsystemtests(fuelpressure,volume,fuellevel,quality,contamination);

determineneededrepairs. 6. Performairintakesystemrestrictionandleakagetest;determineneededrepairs. 7. Performintakemanifoldboostpressuretest;determineneededrepairs. 8. Performexhaustbackpressuretests;determineneededrepairs. 9. Performcrankcasepressuretest;determineneededrepairs.10. Diagnosenocranking,cranksbutfailstostart,hardstarting,andstartsbutdoesnot

continuetorunproblems;determineneededrepairs.11. Diagnosesurging,roughoperation,misfiring,lowpower,slowdeceleration,slow

acceleration,andengineshutoffproblems;determineneededrepairs.12. Isolateanddiagnoseenginerelatedvibrationproblems;determineneededrepairs.13. Checkcoolingsystemforcoolanttype,freezepoint,boilingpoint,contamination,

coolantlevel,temperature,pressure,conditionerconcentration(supplementalcoolantadditive),filtration,andfanoperation;determineneededrepairs.

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14. Checklubricationsystemforcontamination,oillevel,temperature,pressure, filtration,andoilconsumption;determineneededrepairs.Changeoilandfilters.

15. Connectdiagnostictooltovehicle/engineandverifysoftwaretocheck,record,andclearactiveandinactivediagnostictroublecodes(DTCs);monitorelectronicenginedata.

B. In-Chassis Engine Inspection and Repair (6 questions) 1. Remove,clean,inspect,andreinstallcylinderhead(s)assembly. 2. Inspectcylinderheadthreadedholes,studs,andboltsforservice-ability;service/

replaceasneeded. 3. Measurecylinderheaddeck-to-deckthicknessandmatingsurfaceareasforwarpage;

inspectforcracks/damage;checkconditionofpassages;inspectcoreandgalleryplugs;serviceasneeded.

4. Inspectandreplaceinjectorsleevesandseals/0-ringswherespecifiedby manufacturer.

5. Inspectvalvesprings,retainers,and/orrotaters,locksandseals,determineneededrepairs.

6. Inspectpushrods,rockerarms,rockerarmshafts,andbracketsforwear,bending,cracks,looseness,andblockedoilpassages;repair/replaceasneeded.

7. Inspect,replacecamfollowers. 8. Inspect,measureandreplacecamshaft;measure/adjustendplay;measurelobeforlift. 9. Inspect,replace,andtimetheenginegeartrain(includescheckinggearwearand

backlashofcamshaft,auxiliary,andidlergears).10. Adjustvalveclearanceandinjectorsettings.11. Inspect,service,andinstallpans,covers,vents,enginedrivenaccessories,mounts

andsupports,gaskets,seals,andwearrings.12. Cleanandinspectengineblockassemblyforcracks,andmatingsurfaceareasfor

damageorwarpage;checkconditionofpassages,core,andgalleryplugs;inspectthreadedholes,studs,dowelpinsandboltsforserviceability;service/replaceasneeded.

13. Measurelinerheight(protrusion)andcounterboredepth;determineneededrepairs.14. Inspect,measure,service/replacecrankshaftvibrationdamperandflywheel.15. Inspectcylinderwallsorliners,pistonsandringsforwearanddamage;determine

neededservice.

C. Lubrication and Cooling Systems Diagnosis and Repair (7 questions) 1. Verifyengineoilpressureandcheckpressuregauge,sendingunit,andwarning

devices. 2. Inspect,measure,repair/replaceoilpump,drives,inletpipes,andscreens. 3. Inspect,repair/replaceoilpressureregulatorvalve(s),bypassvalve(s),andfilters. 4. Inspect,clean,test,reinstall/replace,oilcooler;test,reinstall/replacebypassvalve

andoilthermostatvalve;inspectandrepair/replacelinesandhoses. 5. Inspectandcleanturbochargerlubricationsystem;replaceasneeded. 6. Inspect,reinstall/replace,drivebelts,pulleys,idlerpulleys,andautomatictensioners;

checkalignmentandadjustdrivebelts. 7. Verifycoolanttemperatureandchecktemperaturegauge,sendingunit,andwarning

devices.

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8. Inspectandreplacecoolantthermostat(s),bypasses,housing(s),andseals. 9. Flushandrefillcoolingsystemwithcorrectcoolanttype;bleedairfromsystem.10. Inspect,repair/replacecoolantconditioner(supplementalcoolantadditive)filter,

checkvalves,lines,andfittings.11. Inspect,repair/replacewaterpumpandhoses.12. Inspectandcleanradiator,pressurecap,andtank(s);determineneededservice.13. Inspect,repair/replacefanhub,fan,fanclutch,fancontrols,fanthermostat,andfan

shroud.14. Inspect,repair/replaceradiatorcoverings,(includingshutterassembly,controls,

andwinterfronts).15. Inspect,test,repair/replacecomponentsofengineblockheatersystems.

D. Air Induction and Exhaust Systems Diagnosis and Repair (9 questions) 1. Inspect,service/replaceairinductionpiping,aircleaner,andelement;checkforair

restriction;checkoperationofairrestrictionindicatorandhousingdrainvalve. 2. Inspect,test,andrepair/replaceturbocharger(s)(includingvariableratio/geometry

VGT),pneumatic,hydraulic,electroniccontrols,andactuators;inspect,test,andreplacewastegateandwastegatecontrols.

3. Inspect,repair/replaceintakemanifold,gaskets,temperatureandpressuresensors,andconnections.

4. Inspect,test,clean,replacechargeaircoolerandpipingsystem. 5. Inspect,repair/replaceexhaustmanifold,gaskets,piping,mufflers,exhaustaftertreat-

mentdevices,(includingthree-wayandoxidationcatalystanddieselparticulatefiltersDPF)andmountinghardware.

6. Inspect,test,andrepair/replacepreheater/inletairheater,orglowplugsystemandcontrols.

7. Inspect,test,andreplaceexhaustaftertreatmentregenerationsystemandcontrols. 8. Inspect,test,service,andreplaceEGRsystemcomponents;includingEGRvalve,

cooler,piping,filter,sensors,controls,andwiring.

E. Fuel System Diagnosis and Repair (15 questions) 1. Inspect,repair/replacefueltank,vent,cap,mounts,tankprotection(cages),valves,

screen,supplylines,returnlines,fittings,andseals. 2. Inspect,clean,test,repair/replacefueltransfer(lift)pump,pumpdrives,screens,

fuel/waterseparators/indicators,filters,heaters,andassociatedmountinghardware. 3. Checkfuelsystemforair;determineneededrepairs. 4. Primeandbleedfuelsystem;check,repair/replaceprimerhandpump. 5. Inspect,adjust,repair/replacethrottlecontrollinkage. 6. Performon-engineinspections,tests,adjustments,andtime,orreplacerotary-type

andinlineinjectionpumps. 7. Performon-engineinspections,tests,andadjustments,orreplacefuelinjectors. 8. Inspectandtestair/fuelratiocontrolsandtimingadvancemechanisms;determine

neededrepairs. 9. Inspect,reinstall/replacehigh-pressureinjectionlines,fittings,andseals.10. Inspect,test,adjust,repair/replaceenginefuelshutoffdevicesandcontrols.11. Useascantool,digitalmultimeter(DMM),and/orPC-baseddiagnostictoolto

inspectortestelectronicenginecontrolsystemsensors,actuators,circuits,harnesses,andelectroniccontrolmodule(ECM);determineneededrepairs.

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12. Inspect,adjust,repair/replaceelectronicthrottlecontrols.13. Performon-engineinspectionsandtestsonhydraulicelectronicunitinjectors

(HEUI)andsystemcontrols(commonrailorrailpressurecontrol)andelectronic unitinjectionsystemcontrols.

14. Diagnoseenginelowpowerproblemscausedbyrelatedelectronictransmission andtractioncontrolsystems.

15. Inspect,test,andreplaceelectricalconnectorterminals,pins,harnesses,deals, andlocks.

F. Starting System Diagnosis and Repair (3 questions) 1. Performbatterystate-of-chargetest,chargebattery(s)asneeded,loadtest;determine

neededservice. 2. Startvehicleusingjumpercables,boosterbattery,orauxiliarypowersupply. 3. Inspect,cleanbatterycablesandterminals;performbatterycablevoltagedroptest. 4. Inspect,test,andreinstall/replacestarterrelays,safetyswitch(s),vandallocksystem,

andsolenoids. 5. Performstartercurrentdrawtest;determineneededrepairs. 6. Performstartercircuitvoltagedroptests;determineneededrepairs. 7. Removeandreplacestarter.

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quESTionS:

1. AdrivercomplainsthataTypeCschoolbushasexcessiveblacksmokewhenstartedinthemorning.Whichofthesecouldbethecause?

*(A)Abadfuelinjectionnozzle (B)Arestrictedfuelfilter (C)Ablockedfueltankvent (D)Aleakingfuelreturnline 2. Thedrivercomplainsthattheschoolbuswillnotcrank.Themostlikely

causeis: (A)Loosestarterbolts *(B)Anopenvandallockcircuit (C)Ashortedstartergroundcable (D)Thegearselectorleftinneutral 3. Aschoolbusenginerepeatedlythrowsofftheengineaccessorydrivebelts.

Whichoftheseisthemostlikelycause? (A)Wornpulleygroves (B)Anover-tighteneddrivebelt (C)Loosedrivelineyokes *(D)Anout-of-balancecrankshaftvibrationdamper 4. Anin-linesixcylinderdieselenginehasablownheadgasket.

TechnicianAsaysthatthecylinderheadshouldbecheckedforcracks. TechnicianBsaysthatcylinderlinerprotrusionshouldbechecked. Whoisright?

(A)Aonly (B)Bonly *(C)BothAandB (D)NeitherAnorB

SAmplE quESTionSdiESEl EnginES (TEST S2)

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5. Duringacoldweatherstart-up,theoilfilterruptures,causinganoilleak. Thiscouldbecausedby:

*(A)Astuck-closedoilfilterbypassvalve (B)Astuck-openoilpressureregulatorvalve (C)Useofahigh-viscositymotoroil (D)Excessiveenginerpmsatstart-up

6. Whatisthetechniciancheckingintheillustrationshownabove? (A)Valveprotrusion (B)Valverecession (C)Coolantnozzlerecession *(D)Cylinderheadwarpage 7. Duringadieselengineoverhaul,thecylinderlinersarefoundtohaveexcessive

externalcavitationerosion. TechnicianAsaysthatimproperlytreatedcoolantcouldbethecause. TechnicianBsaysthatanimproperantifreezetowatermix(ratio)couldbethecause. Whoisright?

(A)Aonly *(C)BothAandB (B)Bonly (D)NeitherAnorB

8. AHEUIenginerunspoorlyandmisfires.Whileperforminganenginerunninginjectortest,afaultcodeissetforpoor#3cylindercontribution.TechnicianAsaysthatabadinjectoroncylinder#3couldbethecause.TechnicianBsaysthatabentpushrodoncylinder#3couldbethecause.Whoisright?

(A)Aonly *(C)BothAandB (B)Bonly (D)NeitherAnorB

S2 SAmplE quESTionS (conTinuEd)

ASE School BuS Study GuidE PAGE 19

9. Thecauseofaloggedfaultcodeinanelectronicdieselenginehasjustbeen repaired. TechnicianAsaysthatthecodesshouldbeclearedbeforereleasingthevehicle.TechnicianBsaysthatthecustomerspasswordshouldberesetbefore releasingthevehicle. Whoisright?

*(A)Aonly (C)BothAandB (B)Bonly (D)NeitherAnorBQuestion 10 is not like the ones above. IthasthewordEXCEPT.Forthisquestion,lookforthechoicethatcould

NOT causethedescribedsituation.Readtheentirequestioncarefullybeforechoosingyouranswer.

10. ATypeDschoolbushasexcessiveengineoilconsumptionandanoilfilmonthebackofthebus.AllofthesecouldbethecauseEXCEPT:

(A)badturbochargerseals. *(B)acrackedcylinderliner. (C)wornpistonrings. (D)wornvalveguideseals.

S2 SAmplE quESTionS (conTinuEd)

PAGE 20 ASE School BuS Study GuidE

TEST SpEcificATionS And TASk liSTdrivE TrAin TEST (TEST S3)

Content Questions Percentage Area in Test of Test A. Clutch Diagnosis and Repair 4 9% B. Manual Transmission Diagnosis and Repair 4 9% C. Automatic Transmission Diagnosis 25 55% and Repair D. Drive Shaft and Universal Joint Diagnosis and Repair 5 11% E. Drive Axle Diagnosis and Repair 7 16%

Total 45 100%

A. Clutch Diagnosis and Repair (4 questions) 1. Diagnoseclutchnoise,binding,slippage,pulsation,grabbing,hardshifting,and

chatterproblems;determineneededrepairs. 2. Inspect,adjust,repair,orreplaceclutchlinkage,cables,levers,brackets,bushings,

pivots,andsprings(includespushandpull-typeassemblies). 3. Inspect,adjust,repair,orreplacehydraulicclutchslaveandmastercylinders,lines,

andhoses;bleedsystem. 4. Inspectrelease(throw-out)bearingclearance,sleeve,bushing,springs,levers,shafts,

andseals;determineneededrepairs. 5. Inspect,orreplaceclutchpressureplateanddiscassembly. 6. Inspectandreplacepilotbearing;checkpilotbearingboreforcondition. 7. Inspectflywheelmountingareaoncrankshaft;determineneededrepairs. 8. Inspect,service,orreplaceflywheelandstarterringgear. 9. Measureflywheelfacerunout;determineneededrepairs.10. Inspectengineblock,flywheelhousing,andtransmissionhousingmatingsurfaces;

determineneededrepairs.11. Measureflywheelhousingborerunoutandflywheelhousingfacerunout;repair

asnecessary.

B. Manual Transmission Diagnosis and Repair (4 questions) 1. Diagnosetransmissionnoise,hardshifting,lockup,jumping-out-of-gear,overheat-

ing,andvibrationproblems;determineneededrepairs. 2. Removeandreplacetransmission;inspectandreplacetransmissionmounts,

insulators,andmountingbolts. 3. Inspectforleakage;replacetransmissioncoverplates,gaskets,capbolts,andseals;

inspectsealsurfaces.

ASE School BuS Study GuidE PAGE 21

S3 TASk liST (conTinuEd)

4. Checktransmissionfluidlevel,type,andcondition;determineneededserviceand addpropertypeoflubricant.

5. Inspect,adjust,andreplacetransmissionshiftlever,cover,rails,forks,levers, bushings,sleeves,detents,interlocks,springs,andlockbolts.

6. Inspectandreplacespeedometerdrivegearratioadapters,drivengear,cable,andretainers.

7. Inspect,test,orreplacespeedometerspeedsensor. 8. Inspectandtestbackuplightandwarningdevicecircuitswitches.

C. Automatic Transmission Diagnosis and Repair (25 questions) 1. Diagnosenoise,vibration,andshiftingproblems;determineneededrepairs. 2. Checktransmissionfluidlevel;diagnosefluidusageandcondition;determineneeded

serviceandaddpropertypeoflubricant. 3. Performpressuretests;determineneededrepairs. 4. Performstalltests;determineneededrepairs. 5. Performlock-upconvertersystemtests;determineneededrepairs. 6. Diagnosemechanicalandvacuumcontrolsystems;determineneededrepairs. 7. Inspect,adjust,andreplacemanualvalveshiftlinkageandcables. 8. Inspect,adjust,andreplacecables,linkagesorlinesforthrottlevalve(modulator),

kickdown,andacceleratorpedal. 9. Replacefluidandfilter(s).10. Checkdipstickcalibration.11. Inspect,testand/orreplacegovernor,governorcover,andgasket.12. Inspectandreplaceexternalsealsandgaskets.13. Inspect,test,flush,andreplacecooler,lines,filtersandfittings.14. Inspectandreplacespeedometercabledrivegear,drivengear,ratioadapters,

andretainers.15. Inspect,test,orreplacespeedometerspeedsensor(pulsegenerator).16. Inspectandtesttransmissiontemperaturegaugecircuitforaccuracy;determine

neededrepairs.17. Inspect,testoperation,adjust,repair,orreplaceelectronicshiftcontrols,indicators,

speedsensors,electronic/transmissioncontrolunits(ECU/TCU),neutral/ingearandreverseswitches,warningdevices,andwiringharnesses.

18. Inspect,testoperation,repair,orreplaceelectronicshiftselectors(drivercontrols),switches,displays,indicators,andwiringharnesses.

19. Useappropriatediagnostictoolsandsoftware,procedures,andserviceinformation/flowchartstodiagnoseautomatictransmissionproblems;checkandrecord diagnosticcodes,clearcodes,interpretdigitalmultimeter(DMM)readings, determineneededrepairs.

20. Diagnoseautomatictransmissionproblemscausedbydatalink/businterfaceswithrelatedelectroniccontrolsystems.

21. Inspect,replace,andaligntransmissionmounts.22. Removeandreplacetransmission;inspectflexplate.23. Remove,inspect,andreplacetorqueconverter.24. Inspectengineblock,flywheelhousing,transmissionmatingsurfaces,andengine-

to-transmissionmountingadapters;determineneededrepairs.25. Diagnosetransmissionbrakeproblems;determineneededrepairs.

PAGE 22 ASE School BuS Study GuidE

S3 TASk liST (conTinuEd)

D. Drive Shaft and Universal Joint Diagnosis and Repair (5 questions) 1. Diagnosedriveshaftanduniversaljointnoiseandvibrationproblems;determine

neededrepairs. 2. Inspect,service,orreplacedriveshaft,slipjoints,yokes,driveflanges,universal

joints,vibrationdampers;determinedriveshaftphasing. 3. Inspect,repair,andreplacedriveshaftcentersupportbearingsandmounts. 4. Measureloadedandunloadeddrivelineangles;determineneededrepairs. 5. Inspect,adjust,repair,orreplacedrivelineparkingbrakesystemcomponents. 6. Diagnosedrivelineretarderproblems;determineneededrepairs.

E. Drive Axle Diagnosis and Repair (7 questions) 1. Diagnoserearaxledriveunitnoiseandoverheatingproblems;determineneeded

repairs. 2. Checkandrepairfluidleaks;inspectandreplacerearaxledriveunitcoverplates,

gaskets,vents,magneticplugs,andpinionseals. 3. Checkrearaxledriveunitfluidlevelandcondition;determineneededserviceand

addpropertypeoflubricant. 4. Remove,inspect,andreplacedifferentialcarrierassembly. 5. Inspectrearaxlehousingmatingsurfaces;determineneededrepairs. 6. Remove,inspect,andreplaceaxleshafts. 7. Remove,inspect,andreplacerearwheelhubassembly;determineneededrepairs. 8. Diagnosewheelbearingnoisesanddamage;determineneededrepairs. 9. Clean,inspect,lubricate,andreplacewheelbearingconesandraces;cleanand

inspectlockingplatesandnuts,replaceseals,wearrings,andaxleflangegasket;adjustrearwheelbearings.

10. Inspectorreplaceextendedservice(sealed,close-tolerance,andunitized)bearingassemblies;performinitialinstallationadjustmentprocedures.

11. Check,adjust,andreplacewheelspeedsensor(s).

ASE School BuS Study GuidE PAGE 23

SAmplE quESTionSdrivE TrAin (TEST S3)

quESTionS:

1. ATypeAschoolbuswithanoverdrivetransmissionandacomputer-controlledlock-upconverterhasshiftsthatareearlyandverysoft.Themostlikely causeis:

*(A)Animproperlyadjustedthrottlevalve(TV)cable. (B)Aslippingconverterclutch. (C)Aworngovernorgear. (D)Ashortedconverterclutchsolenoid. 2. TechnicianAsaysthatavibrationinthedrivelinecouldbecausedbyexcessive

universaljointmovement. TechnicianBsaysthatavibrationinthedrivelinecouldbecausedbyan incorrectuniversaljointoperatingangle. Whoisright?

(A)Aonly (B)Bonly *(C)BothAandB (D)NeitherAnorB 3. Theautomatictransmissionfluidofaschoolbusisdiscoloredandhasan

unusualodor.Themostlikelycauseis: (A)Overrunningtheenginegovernor. *(B)Overheatingthetransmission. (C)Adraggingspring(parking)brake. (D)Impropergearselection. 4. Thefluidlevelinaschoolbusautomatictransmissionshouldbechecked

withthe: (A)Engineshutoffatnormaloperatingtemperatures. (B)EngineshutoffandthetransmissioninNEUTRAL. (C)EnginerunningandthetransmissioninDRIVE,atnormaloperating

temperatures. *(D)EnginerunningandthetransmissioninPARK,atnormaloperating

temperatures.

PAGE 24 ASE School BuS Study GuidE

5. Whichoftheseisbeingcheckedinthesetupshownabove? *(A)Clutchhousingrunout (B)Clutchdiscrunout (C)Pilotbearingwear (D)Clutchdiscsplinewear 6. TherearaxleinaTypeCschoolbusisnoisyondeceleration.Whichofthese

isthemostlikelycause? (A)Awornringandpinion (B)Aworncarrierbearing *(C)Abadfrontpinionbearing (D)Abadrearpinionbearing 7. Acomputer-controlledtransmissionstartsoffinhighgear.Whichofthese

couldbethecause? *(A)Abadtransmissioncontrolmodule (B)Abadcoolanttemperaturesensor (C)Alowtransmissionfluidlevel (D)Astuckone-wayclutch Question 8 is not like the ones above. IthasthewordEXCEPT.Forthisquestion,lookforthechoicethatcould

NOT causethedescribedsituation.Readtheentirequestioncarefullybeforechoosingyouranswer.

8. Aschoolbusdriverreportsthattheclutchslipswhenthebusisaccelerated.AllofthesecouldbethecauseEXCEPT:

(A)Noclutchpedalfreeplay. (C)Wornpressureplatesprings. (B)Awornclutchdisc. *(D)Excessiveflywheelrunout.

S3 SAmplE quESTionS (conTinuEd)

ASE School BuS Study GuidE PAGE 25

Content Questions Percentage Area in Test of Test A. Air Brakes Diagnosis and Repair 28 56% 1. Air Supply and Service Systems (15) 2. Mechanical/Foundation (9) 3. Parking Brakes (4) B. Hydraulic Brakes Diagnosis and Repair 18 36% 1. Hydraulic System (9) 2. Mechanical System (6) 3. Power Assist Units and Misc. (3) C. Wheel Bearings Diagnosis and Repair 4 8%

Total 50 100%

TEST SpEcificATionS And TASk liSTBrAkES (TEST S4)

A. Air Brakes Diagnosis and Repair (28 questions)

1. Air Supply and Service Systems (15 questions) 1. Diagnosepoorstopping,airleaks,pulling,grabbing,ordraggingcomplaintscaused

bysupplyandservicesystemproblems;determineneededrepairs. 2. Checkairsystembuild-upandrecoverytime;determineneededrepairs. 3. Drainairreservoirtanks;checkforoil,water,andforeignmaterial;determineneeded

repairs. 4. Inspect,adjust,align,orreplaceaircompressordrivebelts,pulleys,tensioners,drive

gears,andcouplings. 5. Inspect,repair,orreplaceaircompressor,aircleaner,oilandwaterlinesandfittings. 6. Inspect,test,adjust,orreplacesystempressurecontrols(governor/reliefvalve),

unloaderassemblyvalves,pressureprotectionvalves,andfilters. 7. Inspect,repair,orreplaceairsystemlines,hoses,fittings,andcouplings. 8. Inspect,test,clean,orreplaceairtankrelief(pop-off)valves,one-waycheckvalves,

draincocks,automaticdrain(spitter)valves,heaters,wiring,andconnectors. 9. Inspect,clean,repair,orreplaceairdriersystems,filters,valves,heaters,wiring,

andconnectors.10. Inspect,test,adjust,repair,orreplacebrakeapplication(foot/treadle)valve,fittings,

andmounts;checkandadjustbrakepedalfreeplay.11. Inspect,test,clean,orreplacetwo-way(double)checkvalvesandanti-compounding

valves.12. Inspect,test,repair,orreplacestopandparkingbrakelightcircuitswitches,wiring,

andconnectors.13. Inspect,test,repair,orreplacebrakerelayvalve,quick-releasevalves,andlimiting

quick-releasevalves.

PAGE 26 ASE School BuS Study GuidE

S4 TASk liST (conTinuEd)

14. Inspect,test,andreplaceinversionandemergency(spring)brakecontrolvalve(s).15. Inspect,test,repair,orreplacelowpressurewarningdevices.16. Inspect,test,andreplaceairpressuregauges,lines,andfittings.17. Performantilockbrakesystem(ABS)warninglampstart-uptest;determineneeded

repairs;diagnosehardfaultcodes/diagnostictroublecodes(DTCs)usingscantool,PCcomputer,orLEDs;determineneededrepairs.

18. Diagnosepoorstoppingandlockupproblemsonantilockbrakesystems(ABS);determineneededrepairs.

19. Test,adjust,orreplaceantilockbrakesystem(ABS)wheelspeedsensorsandtone/exciterrings.

20. Testandreplaceantilockbrakesystem(ABS)electroniccontrolunits(ECU)andmodulatorvalves;test,repair,andreplacewiringandconnectors.

2. Mechanical/Foundation (9 questions) 1. Diagnosepoorstopping,brakenoise,pulling,grabbing,ordraggingproblemscaused

byfoundationbrake,slackadjuster,andbrakechamberproblems;determineneededrepairs.

2. Inspect,test,adjust,repair,orreplaceservicebrakechambers,diaphragm,clamp,spring,pushrod,clevis/pins,andmountingbrackets.

3. Inspect,test,adjust,repair,orreplacemanualandautomaticslackadjusters. 4. InspectorreplaceS-camsbrakerollers,camshafts,bushings,seals,spacers,retainers,

brakespiders,shields,anchorsprings,andsprings. 5. Inspect,clean,rebuildorreplace,andadjustairdiscbrakecaliperassemblies. 6. Inspectandreplacebrakeshoes,orpads. 7. Inspect,resurface,orreplacebrakedrumsorrotors.

3. Parking Brakes (4 questions) 1. Inspectandtestparking(spring)brakechamberoperation;replaceparking(spring)

brakechamber;disposeofremovedchambersinaccordancewithlocalregulations. 2. Inspect,test,orreplaceparking(spring)brakevalves,lines,hoses,andfittings. 3. Manuallyreleaseand(cage)reset(uncage)parking(spring)brakes. 4. Inspect,test,orreplaceparkingbrakeinterlockvalve,module,wiring,and

connectors.

B. Hydraulic Brakes Diagnosis and Repair (18 questions)

1. Hydraulic System (9 questions) 1. Diagnosepoorstopping,pulling,dragging,orbrakefeelcomplaintscausedby

hydraulicsystemproblems;determineneededrepairs. 2. Inspecthydraulicsystemforleaks. 3. Checkandadjustbrakepedalfreeplay. 4. Inspect,test,orreplacemastercylinder. 5. Inspect,test,orreplacebrakelines,flexiblehoses,andfittings. 6. Inspect,test,andreplacemetering(hold-off),proportioning,andcombinationvalves. 7. Inspect,test,orreplacebrakepressuredifferentialvalveandwarninglightcircuit

switch,bulbs,wiring,andconnectors. 8. Inspect,andreplacewheelcylinders.

ASE School BuS Study GuidE PAGE 27

S4 TASk liST (conTinuEd)

9. Remove,inspect,clean,andreplacediscbrakecaliperassemblies.10. Inspect/testbrakefluid;bleedand/orflushhydraulicsystem.11. Performantilockbrakesystem(ABS)warninglampstart-uptest;determineneeded

repairs;diagnosehardfaultcodes/diagnostictroublecodes(DTCs)usingscantool,PCcomputer,orLEDs;determineneededrepairs.

12. Diagnosepoorstoppingandlockupproblemsonantilockbrakesystems(ABS);determineneededrepairs.

13. Test,adjust,orreplaceantilockbrakesystem(ABS)wheelspeedsensorsandtone/exciterrings.

14. Testandreplaceantilockbrakesystem(ABS),electroniccontrolunits(ECU)andmodulatorvalves;test,repair,andreplacewiringandconnectors.

15. Inspect,test,andreplaceparkingbakeinterlockvalves,modules,wiring,and connectors.

2. Mechanical System (6 questions) 1. Diagnosepoorstopping,noise,pulling,grabbing,dragging,orpedalpulsation

complaintscausedbydrumanddiscbrakemechanicalassemblyproblems;determineneededrepairs.

2. Inspect,resurface,orreplacebrakedrumsorrotors. 3. Inspect,adjust,orreplacedrumbrakeshoes,mountinghardware,adjustermecha-

nisms,andbackingplates. 4. Inspect,orreplacediscbrakepadsandmountinghardware;inspectorreplaceanchor

plateandmountinghardware. 5. Inspect,adjust,andrepairorreplacein-wheelmechanicalandhydraulicparking

brakesystems. 6. Inspect,adjust,orreplacedrivelineparkingbrakedrums,rotors,bands,shoes,mount-

inghardwareandadjusters. 7. Inspect,adjust,orreplacedrivelineparkingbrakeapplicationsystempedal,actuators,

cables,linkage,levers,pivots,springs,bearings,andseals.

3. Power Assist Units and Miscellaneous (3 questions) 1. Diagnosepoorstoppingcomplaintscausedbypowerbrakeboosterproblems;

determineneededrepairs. 2. Inspect,test,repair,orreplacepowerbrakeboosterhosesandcontrolvalves. 3. Test,adjust,andreplacebrakestoplightswitch,bulbs,wiring,connectors,and

warningdevices.

C. Wheel Bearings Diagnosis and Repair (4 questions) 1. Removeandreplaceaxlehubandwheelassembly. 2. Clean,inspect,lubricate,orreplacewheelbearingassemblies;replacesealsand

wearrings(ifapplicable). 3. Adjustaxlewheelbearingsinaccordancewithmanufacturersproceduresand

specifications(includesstandardandunitized).

PAGE 28 ASE School BuS Study GuidE

SAmplE quESTionSBrAkES (TEST S4)

quESTionS:

1. Theparkingbrakesfailtoapplyonaschoolbuswithairbrakes. TechnicianAsaysthatlowairpressureinthespringbrakechambercouldbethecause. TechnicianBsaysthatarupturedspringbrakediaphragmcouldbethecause. Whoisright?

(A)Aonly (C)BothAandB (B)Bonly *(D)NeitherAnorB 2. Aschoolbushasanunevenbrakingproblem.Whichofthesecouldbe

thecause? (A)Abindingtreadle(foot)valve *(C)Abadbrakedrum (B)Lowbrakelineairpressure (D)Abadgovernor 3. Theslackadjustershownisbeingadjusted.

TechnicianAsaysthattravelXshouldbeasshortaspossiblewithoutcausingthebrakestodrag. TechnicianBsaysthatangleYshouldbelessthan90whenthebrakes areapplied. Whoisright?

*(A)Aonly (B)Bonly (C)BothAandB (D)NeitherAnorB

Y

X

ASE School BuS Study GuidE PAGE 29

S4 SAmplE quESTionS (conTinuEd)

4. Allthebrakesdragonaschoolbuswithhydraulicbrakes.Thisismostlikelycausedby:

(A)Airinthehydraulicsystem. (B)Excessivevacuumsupplytothepowerbrakebooster. (C)Aleakingsecondarycupinthemastercylinder. *(D)Nobrakepedalfreetravel. 5. TechnicianAsaysthatthelowairpressurewarningsystemmustprovide

asignalthatthedrivercanhear. TechnicianBsaysthatthelowairpressurewarningsystemmustprovide asignalthatthedrivercansee. Whoisright?

(A)Aonly *(C)BothAandB (B)Bonly (D)NeitherAnorB 6. Themostlikelycausefornoairpressureinthesecondaryairreservoirtankis: (A)Animproperlyadjustedairgovernor. *(B)Apluggedone-waycheckvalve. (C)Aweakpressurereliefvalve. (D)Arestrictedcompressormaindischargeline.

Questions 7 and 8 are not like the ones above. EachofthesehasthewordEXCEPT.Foreachquestion,lookforthechoice

thatcouldNOTcausethedescribedsituation.Readtheentirequestion carefullybeforechoosingyouranswer

7. Thedriverofaschoolbuswithairbrakessaysthatithaspoorstoppingpower.AllofthesecouldbethecauseEXCEPT:

*(A)Thequick-releasevalveexhaustportisplugged. (B)Theairpressureistoolow. (C)Theapplicationlineisrestricted. (D)Thebrakesareadjustedwrong.

8. Thelowairpressureindicatorstaysonwhentheairpressuregaugeshows 100psi.AllofthesecouldbethecauseEXCEPT:

(A)Burnedcontactpointsinthepressureswitch. *(B)Lowbatteryvoltageatthepressureswitch. (C)Apluggedairinlettothepressureswitch. (D)Ablowndiaphragminthepressureswitch.

PAGE 30 ASE School BuS Study GuidE

Content Questions Percentage Area in Test of Test A. Steering System Diagnosis and Repair 18 36% B. Suspension Systems Diagnosis and Repair 18 36% 1. Independent Front Suspensions (5) 2. Straight/I-Beam Axle Diagnosis and Repair (6) 3. Rear Suspensions (7) C. Wheel Alignment Diagnosis, Adjustment, and Repair 8 16% D. Wheels and Tires Diagnosis and Repair 6 12%

Total 50 100%

TEST SpEcificATionS And TASk liSTSuSpEnSion And STEEring (TEST S5)

A. Steering System Diagnosis and Repair (18 questions)1. Diagnosesteeringcolumn(tiltandfixed)shaftnoise,looseness,andbinding

problems;determineneededrepairs.2. InspectandreplacesteeringshaftU-joint(s),slipjoints,bearings,bushings,andseals;

phaseshaftU-joints.3. Diagnosepowersteeringsystemnoises,steeringbinding,uneventurningeffort,

looseness,hardsteering,overheating,fluidleakage,andfluidaerationproblems;determineneededrepairs.

4. Inspectpowersteeringfluidlevelandcondition;determineneededserviceandfluidtype.

5. Purgeairfromthepowersteeringsystem.6. Performpowersteeringsystempressureandflowtests;determineneededrepairs.7. Inspect,service,orreplacepowersteeringreservoirincludinghoses,filter,seals,

andgaskets.8. Inspect,adjust,align,orreplacepowersteeringpumpbelt(s),pulley(s),andtension-

ers.9. Inspectpowersteeringpumpdrivegearandcoupling;replaceasrequired.10. Inspect,adjust,repair,orreplacepowersteeringpump,mountings,andbrackets.11. Inspect,test,orreplacepowersteeringpumpinternal/externalpressureregulator

valve(s).12. Inspectandreplacepowersteeringsystemlines,hoses,cooler,andfittings.13. Inspect,adjust,orreplaceintegral-typepowersteeringgear.14. Inspectandreplacepitmanarm.

ASE School BuS Study GuidE PAGE 31

S5 TASk liST (conTinuEd)

15. Inspect,adjust,orreplacedraglink/centerlink,tierods,andends;positionadjustingsleeves,clamps,andretainers.

16. Inspectand/orreplaceidlerarm(s).17. InspectandreplacesteeringandAckerman(tierod)arms.18. Checkandadjuststeeringlinkageorwheelstops(axlestops).19. Checkandadjuststeeringgearpoppets/reliefvalves.

B. Suspension Systems Diagnosis and Repair (18 questions)

1. Independent Front Suspensions (5 questions)1. Diagnosefrontsuspensionsystemnoises,looseness,bodysway,androughride;

determineneededrepairs.2. Inspectandreplaceupperandlowercontrolarms,strutrods/radiusarms,bushings,

shafts,andrebound/jouncebumpersonshortandlongarm(SLA)suspension systems.

3. Inspectandreplaceupperandlowerballjointsand/orkingpins.4. Inspectandreplacesteeringknuckle/spindleassemblies.5. Measureandcorrectrideheightasrequired.6. Inspectandreplacefrontsuspensionsystemcoilspringsandspringinsulators

(silencers);measurerideheight.7. Inspectandreplacestabilizerbar(swaybar)bushings,brackets,andlinks.8. Inspectandreplaceshockabsorbers,bushings,brackets,andmounts.

2. Straight/I-Beam Axle Diagnosis and Repair (6 questions)1. Diagnosefrontsuspensionsystemnoises,looseness,bodysway,androughride;

determineneededrepairs.2. Inspectandreplacefrontaxle,U-bolts,andnuts.3. Inspect,serviceorreplacekingpin,steeringknucklebushings,locks,bearings,shims,

seals,andcovers.4. Inspectandreplaceshockabsorbers,bushings,brackets,andmounts.5. Inspect,repair,orreplaceleafsprings,shims/wedges,centerbolts,clips,fasteners,

bushings,shackles,pins,insulators,brackets,andmounts.6. Measurevehiclerideheight;determineneededadjustmentsorrepairs.

3. Rear Suspensions (7 questions)1. Diagnosesuspensionsystemnoises,looseness,roughride,andbodyswayproblems;

determineneededrepairs.2. Inspectandreplacerearaxlehousing,U-bolts,andnuts.3. Inspectandreplaceshockabsorbers,bushings,brackets,andmounts.4. Measurevehiclerideheight;determineneededadjustmentsorrepairs.5. Inspectandreplaceleafsprings,centerbolts,clips,fasteners,bushings,shackles,

pins,insulators,brackets,shims/wedges,andmounts(padsandsaddles).6. Inspectandreplacetorquearms(rods),pins,bolts,bushings,andmounts.7. Inspect,test,adjust,repair,orreplaceairsuspensionpressureregulator,pressure

protectionvalve(s),heightcontrolvalve(s),links,lines,hoses,andfittings.8. Inspect,test,repair,orreplaceairbags,springs,shims,mountingplates,suspension

arms,bushings,pinsandbolts.

PAGE 32 ASE School BuS Study GuidE

S5 TASk liST (conTinuEd)

C. Wheel Alignment Diagnosis, Adjustment, and Repair (8 questions)1. Diagnosevehiclewandering,pulling,shimmy,darting,andsteeringeffortproblems;

determineneededadjustmentsorrepairs.2. Checkandadjustcamberandcaster;determineneededrepairs.3. CheckSAI(steeringaxisinclination)/KPI(kingpininclination)andincludedangle;

determineneededrepairs.4. Checkandadjusttoe.5. Diagnosetoe-out-on-turn(Ackermanangle)problems;determineneededrepairs.6. Checkrearaxlealignment(thrustline/centerline)andtracking;adjustordetermine

neededrepairs.7. Checkandadjuststeeringand/ordriveaxlewheelbearings.

D. Wheels and Tires Diagnosis and Repair (6 questions)1. Diagnosetirewearpatterns;determineneededrepairs.2. Inspect,repair,orreplacetires;checkairpressure;valvestems,andcaps.3. Diagnosewheel/tirevibration,wheelhop,andshimmyproblems;determineneeded

repairs.4. Inspectandreplacewheels/rims,wheelspacers,clamps,studs,andnuts.5. Measurewheelandtireradialandlateralrunout;determineneededrepairs.6. Balancewheelandtireassembly.7. Measuretirediameterand/orcircumference;matchtiresandrims.

ASE School BuS Study GuidE PAGE 33

SAmplE quESTionSSuSpEnSion And STEEring (TEST S5)

quESTionS:

1. Whichofthesecouldcausethefronttiresofaschoolbustoshowafeatherededgewearpattern?

*(A)Awrongtoesetting (C)Awrongcastersetting (B)Awrongcambersetting (D)Wrongtirepressures 2. Excessivesteeringwheelfreeplaymaybeanindicationof: (A)Aloosepowersteeringpumpdrivebelt. (B)Improperlyadjustedaxlestops. (C)Contaminatedpowersteeringfluid. *(D)Loosesteeringsector-to-framemountingbolts. 3. Aschoolbushasahistoryofspringsbreakingatthecenterboltholes.

TechnicianAsaysthatlooseu-boltscouldbethecause. TechnicianBsaysthatloosespringshacklescouldbethecause. Whoisright?

*(A)Aonly (C)BothAandB (B)Bonly (D)NeitherAnorB 4. Aschoolbushasagreaterturningradiusinonedirectionthanintheother.

Thiscouldbecausedby: (A)Over-tightenedwheelbearingadjustment. (B)Airinthehydraulicsystem. (C)Incorrectpowersteeringfluid. *(D)Incorrectaxlestopadjustment. 5. Atechnicianfindslowpumppressureduringapowersteeringpressuretest.

Whichofthesecouldbethecause? (A)Excessivehoseback-pressure (B)Awornsteeringgear (C)Ahighfluidlevel *(D)Awornpowersteeringpump

PAGE 34 ASE School BuS Study GuidE

6. Aschoolbusdriverreportsthatthefrontendstartstoshimmyat40mph(64kph)andstopsat45mph(72kph).Thiscouldbecausedbya:

*(A)missingwheelweight. (B)wornswaybarbushing. (C)brokenspringleaf. (D)drykingpinbushing. 7. Aschoolbusleanstooneside.Themostlikelycauseis: (A)AloosespringU-bolt. *(B)Abrokenleafspring. (C)Badshockabsorbers (D)Loosespringshackles. Question 8 is not like the ones above. IthasthewordEXCEPT.Forthisquestion,lookforthechoicethatcould

NOT causethedescribedsituation.Readthequestioncarefullybefore choosingyouranswer.

8. AllofthesemustbecheckedbeforealigningthefrontwheelsonaschoolbusEXCEPT:

(A)tirepressure. (B)trimheight. (C)wheelbearingadjustment. *(D)tirebalance.

S5 SAmplE quESTionS (conTinuEd)

ASE School BuS Study GuidE PAGE 35

TEST SpEcificATionS And TASk liSTSElEcTricAl/ElEcTronic SySTEmS (TEST S6)

Content Questions Percentage Area in Test of Test A. General Electrical Diagnosis 4 9% B. Battery Diagnosis and Service 3 6% C. Starting System Diagnosis and Repair 7 16% D. Charging System Diagnosis and Repair 7 16% E. Lighting Systems Diagnosis and Repair 15 33% 1. Headlights, Daytime Running Lights, Fog Lights, Parking, Clearance, Tail Lights, Dome, Stepwell, Strobe, and Dash Lights (7) 2. Stoplights, Turn Signals, Hazard Lights, Back-up Lights/Alarms, and 4-Lamp and 8-Lamp Warning Systems (8) F. Gauges and Instrument Warning Device Diagnosis and Repair 4 9% G. Miscellaneous 5 11%

Total 45 100%

A. General Electrical System Diagnosis (4 questions) 1. Checkcontinuityinelectrical/electroniccircuitsusingappropriate

testequipment. 2. Checkappliedvoltages,circuitvoltages,andvoltagedropsinelectrical/electronic

circuitsusingadigitalmultimeter(DMM). 3. Checkcurrentflowinelectrical/electroniccircuitsandcomponentsusinganammeter. 4. Checkresistanceinelectrical/electroniccircuitsandcomponentsusinganohmmeter. 5. Locateopen,shorted,andgroundedcircuitsinelectrical/electronicsystems. 6. Diagnosekey-offbatterydrainproblems. 7. Inspect,test,andreplacefusiblelinks,circuitbreakers,andfuses. 8. Inspect,test,andreplacespikesuppressioncapacitors,resistorsanddiodes.

B. Battery Diagnosis and Service (3 questions) 1. Performbatterycapacity(load,highratedischarge)test;determineneededservice. 2. Determinebatterystate-of-chargebymeasuringterminalpostvoltageusingadigital

multimeter(DMM). 3. Inspect,clean,service,orreplacebatteries.

PAGE 36 ASE School BuS Study GuidE

S6 TASk liST (conTinuEd)

4. Inspect,clean,repair,andreplacebatteryboxes,mounts,andholddowns. 5. Chargebatteryusingsloworfastchargemethodasappropriate. 6. Inspect,clean,repair,andreplacebatterycablesandconnectors. 7. Jumpstartavehicleusingjumpercablesandaboosterbatteryorauxiliarypower

supply.

C. Starting System Diagnosis and Repair (7 questions) 1. Performstartercurrentdrawtest;determineneededrepairs. 2. Performstartercircuitvoltagedroptests;determineneededrepairs. 3. Inspect,test,andreplacecomponentsandwiringinthestartercontrol/interrupt

circuit. 4. Inspect,remove,andreplacestarter. 5. Inspect,test,andreplacestarterrelaysandsolenoids/switches.

D. Charging System Diagnosis and Repair (7 questions) 1. Diagnosedash-mountedchargemetersand/orindicatorlightsthatshowanocharge,

lowcharge,oroverchargecondition;determineneededrepair. 2. Diagnosethecauseofanocharge,lowcharge,oroverchargecondition;determine

neededrepair. 3. Inspect,adjust,andreplacealternatordrivebelts,pulleys,fans,andmounting

brackets. 4. Performchargingsystemoutputtest;determineneededrepairs. 5. Performchargingcircuitvoltagedroptests;determineneededrepairs. 6. Inspect,removeandreplacealternator. 7. Inspect,repair,orreplaceconnectorsandwiringinthechargingcircuit.

E. Lighting Systems Diagnosis and Repair (15 questions)

1. Headlights, Daytime Running Lights, Fog Lights, Parking, Clearance, Tail Lights, Dome, Stepwell, Strobe, and Dash Lights (7 questions) 1. Diagnosethecauseofbrighter-than-normal,intermittent,dim,ornoheadlight

operation. 2. Inspect,test,aim,andreplaceheadlights. 3. Inspect,test,repair,orreplaceheadlightanddimmerswitches,relays,control

modules,solenoids,wiring,connectors,andsockets. 4. Inspect,test,repair,orreplaceswitches,relays,solenoids,bulbs,LEDs,sockets,con-

nectors,andwiringoffoglight,parking,clearance,stepwell,strobelight, andtaillightcircuits.

5. Inspect,test,repair,orreplacedashlightcircuitswitches,bulbs,LEDs,sockets, connectors,wiring,printedcircuits,andinstrumentpanelwarninglights.

6. Inspect,test,repair,orreplacedomelightcircuitswitches,relays,bulbs,LEDs, sockets,connectors,andwiring.

2. Stoplights, Turn Signals, Hazard Lights, Back-up Lights/Alarms, and 4-Lamp and 8-Lamp Warning Systems (8 questions) 1. Inspect,test,adjust,repair,orreplacestoplightcircuitswitches,relays,bulbs,LEDs,

sockets,connectors,andwiring.

ASE School BuS Study GuidE PAGE 37

S6 TASk liST (conTinuEd)

2. Diagnosethecauseofnoturnsignalandhazardflasherlightsandindicators,orlightswithnoflashononeorbothsides.

3. Inspect,test,repair,orreplaceturnsignalandhazardcircuitflasher,switches,bulbs,LEDs,sockets,connectors,andwiring.

4. Inspect,test,adjust,repair,orreplaceback-uplights/alarmsandwarningdevice circuitswitches,relays,solenoids,bulbs,LEDs,sockets,horns,buzzers,connectors,andwiring.

5. Inspect,test,repairorreplace4-lampand8-lampwarningsystems(motor-driven, sequentialandnon-sequential),stoparmlights,switches,relays,diodes,control/flasherunits,andactuators.

6. Inspect,test,repairorreplace4-lampand8-lampwarningsystems(electronic, sequentialandnon-sequential),stoparmlights,switches,relays,diodes,control/flasherunits,andactuators.

7. Inspect,testandrepairoverridecircuitsfor4-lampand8-lampwarninglightsystems. 8. Inspect,test,adjustandrepairelectronically-controlledstoparmsandcrossinggates.

F. Gauges and Instrument Warning Devices Diagnosis and Repair (4 questions) 1. Diagnoseintermittent,high,low,ornogaugereadings;determineneededrepairs.

(Doesnotincludechargeindicators.) 2. Inspect,test,adjust,repair,orreplacegaugecircuitsendingunits,gauges,connectors,

andwiring. 3. Inspect,test,repair,orreplaceinstrumentwarninglightcircuitsendingunits,bulbs,

sockets,connectors,wiring,diodes,andprintedcircuits. 4. Inspect,test,repair,orreplaceaudiblealarmcircuitsendingunits,buzzers,switches,

relays,connectors,wiring,andprintedcircuits. 5. Inspect,test,replaceandcalibrateelectronicspeedometer,odometer,tachometer

systems,andhourmeters.

G. Miscellaneous (5 questions) 1. Diagnose,inspect,test,repair,orreplacehorncircuitrelays,horns,switches,

connectors,andwiring. 2. Diagnose,inspect,test,repair,orreplacewipermotor,intermittent(delay)module,

transmissionlinkage,resistors,parkswitch,relays,switches,connectors,andwiring. 3. Inspect,test,repair,orreplacewindshieldwashermotor,pump/relayassembly,

switches,connectors,andwiring. 4. Inspect,test,repair,orreplacemirrorheatercircuitgrids,relays,timercircuits,

switches,connectors,andwiring. 5. Inspect,test,repairorreplacemotorizedsideviewmirrorrelays,motors,switches,

connectors,andwiring. 6. Inspect,test,repair,orreplaceheaterelectricalcomponentsincludingblowermotors,

boosterpumps,resistors,relays,switches,connectors,andwiring. 7. Inspect,test,repair,orreplaceaccessorypoweroutlets,integralfuses,connectors,

andwiring. 8. Diagnose,inspect,test,adjust,repairorreplacevandallock/starterinterlocksystem

switches,actuators,relays,alarms,connectors,andwiring. 9. Inspect,test,adjustandrepairelectrically-controlleddooropeningdevices.

PAGE 38 ASE School BuS Study GuidE

1. Ifachargingsystemcheckshowsafullychargedbatteryandahighchargingrate,thetechnicianshouldtestthe:

(A)Alternatordiodes. (B)Statorwindings. *(C)Voltageregulator. (D)Fieldcurrentdraw. 2. Bothheadlightsonaschoolbusaredimonhighbeam,andnormal

onlowbeam. TechnicianAsaysthatapoorheadlightgroundcouldbethecause. TechnicianBsaysthatashortedheadlightswitchcouldbethecause. Whoisright?

(A)Aonly (C)BothAandB (B)Bonly *(D)NeitherAnorB

3. Thehornsinthecircuitshownaboveonlyblowwhenajumperwireis connectedbetweenterminals#1and#2ofthehornrelay. TechnicianAsaysthatabadhornrelaycouldbethecause. TechnicianBsaysthatagroundinthecircuitbetweenthehornrelayandthehornswitchcouldbethecause. Whoisright?

*(A)Aonly (C)BothAandB (B)Bonly (D)NeitherAnorB

SAmplE quESTionSElEcTricAl/ElEcTronic SySTEmS (TEST S6)

quESTionS:

BATTERY

HORNS

2 3

1

HORN RELAY

HORN SWITCH

20 AMPS

ASE School BuS Study GuidE PAGE 39

S6 SAmplE quESTionS (conTinuEd)

4. Whenthedoorisopenedandtheamberlightscancel,theredlightsdonot illuminateonaschoolbuswithanelectronic8-lampwarningsystem. TechnicianAsaysthatabadrelaycouldbethecause. TechnicianBsaysthatabadmasterswitchcouldbethecause. Whoisright?

*(A)Aonly (C)BothAandB (B)Bonly (D)NeitherAnorB 5. Thewindshieldwipersonaschoolbuswillnotpark.Whichoftheseisthe

mostlikelycause? (A)Thewormgearisout-of-adjustment *(B)Abadparkingswitchassembly (C)Abindingwipertransmission (D)Apoorgroundatthewipermotor 6. Whichofthesecouldcausethedriversheaterblowermotortooperateatlow

speedonly? (A)Anopenground (C)Abindingblowercage *(B)Abadheaterswitch (D)Awiringshorttotheheater

Questions 7 and 8 are not like the ones above. EachofthesehasthewordEXCEPT.Foreachquestion,lookforthe

choicethatcouldNOT causethedescribedsituation.Readtheentirequestioncarefullybeforechoosingyouranswer.

7. AllofthesecouldcausehighstartercurrentdrawEXCEPT: (A)Wornstarterbushings *(B)Abadstarterrelay (C)Groundedfieldcoils (D)Agroundedarmature 8. Schoolbuseswhicharenotoperatedduringthesummerformorethan30days

shouldhaveallofthesedonetothebatteriesEXCEPT: (A)Removedandstored (B)Periodicallytestedandcharged (C)Disconnectthenegativecable *(D)Replacetheelectrolyte

PAGE 40 ASE School BuS Study GuidE

Content Questions Percentage Area in Test of Test A. A/C System Diagnosis and Repair 16 36% B. A/C System Component Diagnosis and Repair 14 31% 1. Compressor and Clutch (6) 2. Evaporator, Condenser, and Related Components (8) C. Operating Systems and Related Controls Diagnosis and Repair 12 27% D. Refrigerant Recovery, Recycling, and Handling 3 6%

Total 45 100%

TEST SpEcificATionS And TASk liSTAir condiTioning SySTEmS And conTrolS (TEST S7)

A. A/C System Diagnosis and Repair (16 questions) 1. DiagnosethecauseofunusualoperatingnoisesoftheA/Csystem;determineneeded

repairs. 2. IdentifysystemtypeandconductperformancetestontheA/Csystem;determine

neededrepairs. 3. DiagnoseA/Csystemproblemsindicatedbyrefrigerantflowpastthesightglass

(forsystemsusingasightglass);determineneededrepairs. 4. DiagnoseA/Csystemproblemsindicatedbypressuregaugereadings;determine

neededrepairs. 5. DiagnoseA/Csystemproblemsindicatedbyvisualandtouchprocedures;determine

neededrepairs. 6. LeaktestA/Csystem;determineneededrepairs. 7. Determinetypeofrefrigerant;performA/Csystemrecoveryprocedure. 8. EvacuateA/Csystem. 9. InternallycleanA/Csystemcomponentsandhoses.10. ChargeA/Csystemwithrefrigerant(liquidorvapor).

B. A/C System Component Diagnosis and Repair (14 questions)

1. Compressor and Clutch (6 questions) 1. DiagnoseA/Csystemproblemsthatcausethepressureprotectiondevicestointerrupt

systemoperation;determineneededrepairs. 2. TestandreplaceA/Csystempressureprotectiondevices.

ASE School BuS Study GuidE PAGE 41

S7 TASk liST (conTinuEd)

3. Inspect,adjust,andreplaceA/Ccompressordrivebeltsandpulleys;checkoperation ofautomatictensioner(s);checkpulleyalignment.

4. Inspect,test,service,andreplaceA/Ccompressorclutchcomponentsorassembly. 5. Determineoiltype;inspectandcorrectoillevelinA/Ccompressor. 6. Inspect,test,andreplaceA/Ccompressor. 7. Inspect,repairorreplaceA/Ccompressormountings.

2. Evaporator, Condenser, and Related Components (8 questions) 1. Inspect,repairorreplaceA/Csystemmufflers,hoses,lines,in-linefilters,fittings,

andseals. 2. InspectA/Ccondenserforairflowrestrictions;cleanandstraightenfins. 3. Inspect,repairorreplaceA/Csystemcondensercoil,condenserchassis,and

mountings. 4. Removeandreplacereceiver/drier. 5. Removeandreplaceaccumulator/drier. 6. Inspect,test,andreplaceexpansionvalve. 7. Inspect,test,andreplaceorificetube. 8. Inspect,clean,orreplaceevaporatorandinletairfilter. 9. Inspect,clean,andrepairevaporatorhousingandwaterdrain.10. Identify,inspect,andreplaceA/Csystemserviceports(gaugeconnections).

C. Operating Systems and Related Controls Diagnosis and Repair (12 questions) 1. Diagnosefailuresinthecontrolsystemofheating,ventilating,andA/Csystems;

determineneededrepairs. 2. Inspect,test,repair,orreplaceevaporatorblowermotors,resistors,switches,

relay/modules,wiring,andprotectiondevices;checkoperationofelectrically- operatedmode/blenddoors.

3. Inspect,test,repair,orreplaceA/Ccompressorclutchcoil,relay/modules,wiring,sensors,switches,diodesandprotectiondevices.

4. DiagnoseA/Cproblemsrelatedtoengineidlespeedcontrolsystems. 5. Inspect,test,repair,orreplacecondenserfanmotors,relays/modules,switches,

sensors,wiring,andprotectiondevices. 6. Inspect,test,adjust,andrepairorreplaceevaporatortemperatureswitches,sensors,

andwiring. 7. Inspect,test,adjust,andrepairorreplaceelectricalchargingsystemcomponents. 8. Inspect,test,adjust,repair,orreplaceheating,ventilating,andA/Cducts,doors,

hoses,andoutlets. 9. Inspect,test,andreplacemechanicalheater-controlvalvesandmanualshut-off

valves.

D. Refrigerant Recovery, Recycling, and Handling (3 questions)Tasks1through5shouldbeaccomplishedinaccordancewithcurrentEPA regulationsandSAEstandardsformotorvehiclerefrigerants. 1. Maintainandverifycorrectoperationofcertifiedequipment. 2. IdentifyandrecoverA/Csystemrefrigerantandcontainers. 3. Recyclelabelandstore,properlydisposeofrefrigerant,testfornon-condensables

andcontamination.

PAGE 42 ASE School BuS Study GuidE

quESTionS:

1. TheA/CsystemonaTypeAschoolbusisblowingcool,butnotcold,air fromthedashducts.Thesystemhasthecorrectchargeandthepressuregaugereadingsarenormal.Whichoftheseisthemostlikelycause?

(A)Theairrecirculationdoorisstuckclosed. (B)Theheatervalveisstuckclosed. (C)Thesourceofvacuumhasbeenlost. *(D)Theblenddoorisoutofadjustment. 2. AhighpitchednoisecomesfromoneoftheevaporatorswhiletheA/Csystem

isrunning. TechnicianAsaysthatthenoisecouldbecausedbytheA/Csystemequalizing. TechnicianBsaysthatthenoisecouldbecausedbyapartiallyrestricted expansionvalve. Whoisright?

(A)Aonly (C)BothAandB *(B)Bonly (D)NeitherAnorB 3. AnA/Csystemhasalowdischargepressure.Whichofthesecouldbethe

cause? *(A)Abadinternalcompressorseal (B)Arestrictedrefrigerantflowinthecondenser (C)Arestrictedairflowoverthecondenser (D)Acompressorclutchthatwillnotdisengage 4. Thehigh-sidepressurereaches300psiwithin15secondswhenthecompressor

onanA/Csystemisengaged. TechnicianAsaysthatabadcompressorcouldbethecause. TechnicianBsaysthatarestrictionintheevaporatorcouldbethecause. Whoisright?

(A)Aonly (C)NothAandB (B)Aonly *(D)NeitherAnorB

SAmplE quESTionSAir condiTioning SySTEmS And conTrolS (TEST S7)

ASE School BuS Study GuidE PAGE 43

S7 SAmplE quESTionS (conTinuEd)

5. WhichofthesecomponentsshouldbereplacedwhenanA/Csystemisfoundtohaveexcessivemoisture?

(A)Compressor (B)Thermostat *(C)Receiver/drier (D)Evaporator 6. Theaccumulator/drieriswarmonanA/Csystemthathasbeenoperating

(compressorengaged)for20minutes.Whichofthesecouldbethecause? (A)Toolittleclutchairgap *(B)Arefrigerantundercharge (C)Arefrigerantovercharge (D)Anopeninthepressureswitch 7. AnA/Csystemwithanewcompressorandreceiver/drierisnotcooling

properlyandthecompressoriscoldandsweating. TechnicianAsaysthatastuck-openexpansionvalvecouldbethecause. TechnicianBsaysthatanoverchargedsystemcouldbethecause. Whoisright?

(A)Aonly *(C)BothAandB (B)Bonly (D)NeitherAnorB 8. AfterreplacingacondenserandchargingaschoolbusA/Csystem,thereis

alossofrefrigerant.Thiscouldbecausedby: (A)bentcondenserfins. *(B)damagedO-rings. (C)excessiverefrigerantoil. (D)alowrefrigerantcharge. Question 9 is not like the ones above. IthasthewordEXCEPT.Forthisquestion,lookforthechoicethatcouldNOT

causethedescribedsituation.Readtheentirequestioncarefullybefore choosingyouranswer.

9. ThedriverofaTypeDschoolbuscomplainsthatthereisnohotairwhentheblendvalvecontrolismovedfromCOLDtoHOT.AllofthesecouldbethecauseEXCEPTthe:

*(A)Manualshutoffvalvesareopen. (C)Heatercorefiltersareclogged. (B)Coolantlevelislow. (D)Controlcableismisadjusted.

PAGE 44 ASE School BuS Study GuidE

induSTry TrAining

Thefollowingsourcesofinformationprovidecomprehensivelistingsoftrainingresourcesavailabletoworkingtechnicians:

Delmar Cengage LearningP.O.Box6904Florence,KY410221-800-487-8488www.autoed.cengage.comwww.cengage.com/delmar

Motor Age Training for Certification131WestFirstStreetDuluth,MN55802800-240-1968www.motorage.com

In Canada

Thomson Learning Nelson Canada1120BirchmountRoadScarborough,OntarioM1K5G41-800-268-222E-mail:inquire@nelson.com

SpanishLanguageTrainingResourcesForalistingoftrainingproviderswhooffertraining,ortrainingmaterialsinSpanishgotowww.ase.com;oncethere,entertheServiceProfessionalsareaandclickonSpanishLanguageTrainingResources.

CASE:ASECertificationforTrainingProvidersofContinuingAutomotiveServiceEducation.Visitwww.natef.org/case/case_certified.cfmforperiodicupdatestothislist. TheNationalInstituteforAutomotiveServiceExcellence(ASE)anditseducationalfoundation,theNationalAutomotiveTechniciansEducationFoundation(NATEF),offeravoluntarycertificationprogramforinstitutionsandorganizationsprovidingcontinuingautomotiveserviceeducation.ASEseekstoimprovethequalityofcontinuingautomotiveeducationandhelpautomotivetechniciansidentifyappropriatetrainingsourcesandactivitiesbyevaluatingandcertifyingprovidersofcontinuingautomotiveserviceeducationagainstCASEStandards. TheCASEprogramdiffersfromASEsexistingentry-leveltrainingprogramcertificationinthatitaddressesthetrainingprovidersprocessofdevelopinganddeliveringtrainingasopposedtoprescribingspecificprogramcontent.Elementsoforganization,structureandmethodswhichappeartocontributesignificantlytothedevelopmentanddeliveryofhighqualityautomotiveserviceeducation,havebeenidentifiedandincorporatedintotheCASEStandards. ThefollowingtrainingprovidershaveachievedCASEcertification.Pleasenotethat*indicatesaproprietaryprogramunavailabletoalltechnicians.

RecursosdeEducacinenEspaolParaobteneraccesoalalistadeproveedoresdeeducacin,materialeseducativosenEspaoldirjaseawww.ase.com;unavesall,entreenlaseccinEspaolyprosigaalreaListadeEducadoresyMaterialesDidcticos.

MD PublicationsUndercarDigest,JulyIssueTransmissionDigest,SeptemberIssueP.O.Box2210Springfield,MO658011-800-274-7890

Motor Source GuideHearstBusinessPublishing,Inc.645StewartAve.GardenCity,NY11530www.motor.com

Fleet Equipment, April IssueP.O.Box7605Mt.Prospect,IL60056-7605www.truklink.com

ASE School BuS Study GuidE PAGE 45

induSTry TrAining (conTinuEd)

3M Industrial and Transportation Business Services Training and Development3MCenterBuilding225-1N-01St.Paul,MN55144651-737-0141www.3m.com/automotive

ACDelco Service Training6200GrandPointDr.,MC#2-316GrandBlanc,MI48439800-825-5886prompt1www.acdelcotechconnect.com

Affinia Under Vehicle GroupTechnicalServicesDepartment4400PrimeParkwayMcHenry,IL60050815-363-9000askfortechnicalwww.raybestos.com

AKZO NOBEL Coatings Inc., Car Refinishes5555SpaldingDr.Norcross,GA30092770-242-5760www.akzonobelcarrefinishes.net

American Automobile Association, Inc.1000AAADr.Heathrow,FL32746407-444-7169or407-444-8041AllanStanley,astanley@national.aaa.comLenJohannes,ljohannes@national.aaa.comwww.aaa.com

*American Honda Automobile Service Training1919TorranceBlvd.Torrance,CA90501310-783-3557www.honda.com

Automotive Spray Equipment Technologies (ASET)3703WestParkwayBlvd.SaltLakeCity,UT84120801-964-6646www.asetusa.com

ATech Training, Inc12290ChandlerDr.POBox297Walton,KY41094859-485-7229ext.109www.atechtraining.com

BASF Automotive Refinish Division26701TelegraphRd.Southfield,MI48034248-304-5200www.basfrefinish.com

BP Global Fuels Technology150W.WarrenvilleRd.800BuildingNaperville,IL60563312-729-4212www.fuelcertification.com

Chief Automotive Systems996IndustrialDr.Madison,IN47250800-445-9262www.chiefautomotive.com

CARQUEST Technical Institute4401AtlanticAve.Raliegh,NC27604919-573-3000www.CARQUEST.com/CTI

Collision Management Services Inc.2040RLordBaltimoreDr.Baltimore,MD21244410-944-3383www.ineedcms.com/Training.html

Delphi Integrated Service Solutions5820DelphiDr.Troy,MI48098800-545-2220 CustomerSupportwww.delphi-iss.com

DuPont Performance Coatings500EagleviewBlvd.Exton,PA19341610-458-6323www.pc.dupont.com

PAGE 46 ASE School BuS Study GuidE

induSTry TrAining (conTinuEd)

EAST Training Inc.4404SylonBlvd.Hainesport,NJ08036609-267-2223www.easttraining.com

Federal Mogul Technical Education Centers 6565WellsAve.St.Louis,MO63133314-977-0684www.federal-mogul.com

Fox Valley Technical College1825N.BluemoundDr.Appleton,WI54912920-993-5163www.fvtc.edu/public

*General Motors Service Technical College30501VanDykeAve.,M/C480-204-100Warren,MI48090586-947-9704www.gmstc.com

Hunter Engineering11250HunterDr.Bridgeton,MO63044314-731-0000www.hunter.com

I-CAR (Inter-Industry Conference on Auto Collision Repair)5125TrilliumBlvd.HoffmanEstates,IL60192800-422-7872www.i-car.com

Iwata Medea3703WestParkwayBlvd.WestValleyCity,UT87120801-964-6646www.asetusa.com

Jiffy Lube International700Milam,Room24038PNTHouston,TX77002713-546-3957www.jiffylube.com

Kent Automotive6200OakTreeBlvd.,#350Independence,OH44131216-642-5973www.kent-automotive.com

Lawson State Community College11009thAve.,SWBessemer,AL35022205-929-3521www.lawsonstate.edu

Lew Kinney & Associates On-site Welding Training and CertificationsPOBox511,184StateRoute314Centerburg,OH43011740-625-6342

*Lexus, A Division of Toyota Motor Sales, Inc., U.S.A.19001S.WesternAve.Torrance,CA90509TechnicalTraining310-468-4958www.lexus.com

Martin Senour Automotive Finishes7019HighgroveRd.BurrRidge,IL60527630-887-7516www.martinsenour-autopaint.com

Megatech Corporation525WoburnSt.,Suite3Tewksbury,MA01876800-767-6342(US)978-937-9600(Intl)www.megatechcorp.com

Melior, Inc.200CahabaParkCircleWest,Suite250Birmingham,AL35242205-298-8300www.melioronline.com

National Automotive Parts Association (NAPA)2999Circle75Pkwy.Atlanta,GA30339800-292-NIAT(6428)www.niat-training.com

ASE School BuS Study GuidE PAGE 47

induSTry TrAining (conTinuEd)

* This program is proprietary and therefore not available to all technicians.

National Appraisal Institute10150CanogaAveChatsworth,CA91311818-775-1370www.nainstitute.com

Nationwide Training Organization9243ColumbusPikeLewisCenter,OH43035614-840-7169www.nationwide.com

*Navistar, Inc.3033WayneTerraceFortWayne,IN46806260-461-1951www.navistar.com

*Nissan North America, Inc. Customer Loyalty and TrainingP.O.Box685001Franklin,TN37068615-725-8319www.nissantechinfo.com

*Penske Truck LeasingRoute10PheasantRd.,POBox563Reading,PA19607610-775-6479www.gopenske.com

PPG Industries19699ProgressDr.Strongsville,OH44149440-572-6784www.ppg.com

Raytheon Professional Services L.L.C.1919TechnologyDr.Troy,MI48083248-837-6777www.rps.com

Saint Gobain Abrasives1NewBondSt.Worcester,MA01606508-795-2774www.nortonautomotive.comwww.aa.carborundumabrasives.com

SEM Products, Inc.1685OverviewDr.RockHill,SC29730803-207-8231www.semproducts.com

Sherwin-Williams Automotive Finishes Corp. 7019HighgroveRd.BurrRidge,IL60527630-887-7516www.sherwin-automotive.com

Solera, Inc.P.O.Box151376AltamonteSprings,FL32715858-724-1600www.training.audatex.us

Specialty Products Company4045SpecialtyPlaceLongmont,CO80504303-772-2103www.spcalignment.com

Technical Training, Inc. (TTi)2750ProductDr.RochesterHills,MI48309248-853-5550or800-837-5222www.ttinao.com

*Toyota Motor Sales, USA, Inc.19001S.WesternAve.Torrance,CA90509-2991310-468-7171www.toyota.com

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