ATS26 - Torque Converter Operation/Diagnosis Automobile

ATS26 - Torque Converter Operation/Diagnosis

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Automobile Technical Training

Course Overview:In this training center course you will interpret the snapshot data to diagnose a customer drive-ability concern.ATC26 – Torque Converter Operation & Diagnosis is a pre-requisite for this Skill Module, and should be completed prior to taking this module.

Course Requirement:Correctly interpret snapshot data related to torque converter vibration as outlined in the related service information.

Fluid flow

Converter pump assembly

Stator assembly Turbine assembly




Course Requirement: Correctly interpret snapshot data related to torque converter vibration as outlined in the related service information.This activity requires an i-HDS, AT Snap-Shot Data File and a related drivability concern.

fig.1

In SIS, enter the keywords “Torque Job Aid” and click the search button. Open the training aid, “Torque Converter Clutch Shudder Snap Shot Evaluation” Review the entire training aid (Give careful attention to the various types of torque converter faults that are illustrated). Perform the following steps

Launch i-HDS from the desktop by clicking on the icon Select an interface device, then click start. Confirm the correct i-HDS landing screen appears. fig. 1.




Select Stored Data Playback from the Home Menu.

Select Snapshot from the Stored Data Selection Menu

Enter the following information into the Stored Data Browser to filter the correct data file.

Click on the small triangle next to the model to expand the stored data files.

Select 13:29, then click the blue check mark in the lower right corner of the window.

Course Requirement: Correctly interpret snapshot data related to torque converter vibration as outlined in the related service information. (continued)This activity requires an i-HDS, AT Snap-Shot Data File and a related drivability concern.




Follow the specific set-up instructions in the Torque Converter Clutch Shudder Snap Shot Evaluation training aid and determine if there is a fault present relating to the torque converter by comparing your data to the illustrations shown.

1. Was there a problem identified in the data relating to the torque converter? YES________________________NO __________________

2. Explain why you answered “Yes” or “No”. Circle the area on the graph that supports your answer: ____________________________________________________________________________________________________________________________

Exit the snapshot. DO NOT save your configured settings. Proceed to the next page.

Instructor Checkpoint 1You will now need to demonstrate identification of data list items represented in your graph to your instructor.





Instructor Checkpoint 2You will now need to demonstrate identification of data list items represented in your graph to your instructor.

NOTE: SnapshotdatafilesareviewedthoughthepreviousversionofHDSwhichhasadifferentuserinterfacethanthei-HDS.Utilizethefollowingstepstoviewandconfiguretheremainingsnapshotdatafiles.

Select SNAPSHOT from the MODE menu and use the following information to filter the correct data file.Model Accord V6Year 2008SYSTEM EATDATE 4/27/2011VIN 1HGCP36868A080063

Click on the sign to the left of the VIN. When the file expands, a sign will appear. Select 10:59:49. Follow the specific set-up instructions in the Torque Converter Clutch Shudder Snap Shot Evaluation training aid and determine if there is a fault present

relating to the torque converter by comparing your data to the illustrations shown.3. Was there a problem identified in the data relating to the torque converter? YES ________________________NO __________________

4. Explain why you answered “Yes” or “No”. Circle the area on the graph that supports your answer: ____________________________________________________________________________________________________________________________

Exit the snapshot. DO NOT save your configured settings.





Select SNAPSHOT from the MODE menu and use the following information to filter the correct data file.Model Acura TLYear 2012SYSTEM EATDATE 4/13/2015VIN 19UUA8F58CA006919

Click on the sign to the left of the VIN. When the file expands, a sign will appear. Select 16:30:39. Use the training aid to configure the data, then determine the cause using the data and the customer concern.

■ CUSTOMER CONCERN: Vehicle surges at approximately 35 – 40 mph. IncludeVEHICLESPEEDinyouranalysissothatyouremphasiscanbeplacedonthedatainthespeedrangeindicatedbythecustomerconcern. Follow the specific set-up instructions in the Torque Converter Clutch Shudder Snap Shot Evaluation training aid and determine if there is a fault present

relating to the torque converter by comparing your data to the illustrations shown.





Fig.2 Fig.3

If you need to change line colors in the graph for better visibility, use the following steps as a guide to change the displayed parameter color. While viewing the data in line graph – click on the Line Graph Setup Icon. A Line Graph Settings box appears. fig. 2 Click on the current color in the lower left of the settings box. A Color Pallet appears. fig. 3. Select the desired color then click OK.

NOTE: YoumayalsoincreasethelinethicknessbyclickingLineThicknessoftheLineGraphSettingsBox–upperright.fig.2





Refer to the line graph you just set up:5. Did the data indicate there was a problem with the torque converter operation? YES ___________________________ NO ________________________

6. If YES, at approximately what point in time (seconds) does the symptom become apparent?

_________________________________________________________________________________________________________________________

7. If YES, in which gear does the data indicate the fault is most prevalent?

_________________________________________________________________________________________________________________________

NOTE: Usethetimesliderbaratthebottomofthegraphtoscrollthroughthelinegraphdata.


HDSSliderBar

i-HDSSliderBar




In SIS, select TL 2012 from the drop down options. Enter the keyword “A/T System Desc” Click Search

Locate the General Information link labeled A/TSystemDescription–Lock-upSystem(A/T)

8. According to the system description, how many forward speeds does this transmission have? __________________________________________________

9. According to the system description, in which forward speeds is lock-up possible while accelerating? _____________________________________________

10. According to the system description, which shift solenoid valve engages and disengages lock-up? _______________________________________________

11. According to the system description, which clutch pressure control solenoid (CPC) valve operates to regulate the degree of converter lock-up? ____________________________________________________________________________________________________________________________





TECHNOTE:ElectronicshiftvalvesarenormallyclosedvalvesthateitherblockfluidwhileOFF,orallowfluidtopasswhileintheONpositiontochangethepositionofhydraulicshiftvalves.Clutchpressurecontrolsolenoid(CPC)valvesarecurrentcontrolled.Theamountoffluidthatpassesthroughaclutchpressurecontrolsolenoid(CPC)valveisindirectproportiontothecurrentappliedbythePCM.Thoughtheshiftcontrolchartindicatestheclutchpressurecontrolsolenoid(CPC)valveasONorOFF,thei-HDSindicatesthisvalueincurrent.Apredeterminedcurrentisappliedtothesevalveswhileatrest–aprocesscalledDITHERING.AsmallamountofcurrentisdutycontrolledtoeachCPCvalvewhileatrestwhichhelpspreventthemfromsticking.ThevalveisconsideredONwhenacurrentHIGHERthanthevalueatrestisapplied(fig.4).TheshiftsolenoidvalveturnsONtoopenthehydraulicpassagetothelock-upshiftvalvewhichturnsthelock-upclutchONandOFF.Theclutchpressurecontrolsolenoid(CPC)valveregulatesthedegreeoflock-upindirectproportiontotheappliedcurrent.

OFF(REST)STATE-DITHERING

ONSTATE–ANYVALUEABOVEREST

fig. 4

Exit the Lock-Up System Description and locate the link labeled A/TSystemDescription–ElectronicControlSystem Locate the shift control chart within the resource selected above for the 2012 Acura TL. Within the chart: locate the Shift Valve and the CPC valve identified in the previous steps.

12. Record the shift valve and clutch pressure control solenoid valve positions (ON/OFF) for the valves you previously identified, when the shift lever is in reverse: SHIFT VALVE ________________________________________ CPC VALVE _______________________________________________________





Click on the Configuration Icon . Add the shift solenoid valve, and clutch pressure control solenoid (CPC) valve (ACTUAL) identified in the previous steps to your snapshot.

Configure both valves to display as Line Graph. Advance the cursor to the area where the fault is most evident.13. According to the data, is the PCM actively controlling lock-up? YES __________________________________NO _________________________________

TECHTIP:Whenperformingdiagnosisofcertainvibrationorshudderconcerns,itisimportanttorealizethatothersystemsmayreplicatesymptomsexhibitedbyafailingordefectivetorqueconverter–suchasEGRorignitionfaults.ByconsultingtheSystemDescription,youcanquicklycollectthenecessarydatatofindoutifthePCMisactivelycontrollinglock-upwhilethesymptomisoccurring.Ifthesymptomisoccurringandlock-upisnotengaged–anothersystemisatfault.

TECH TIP: On occasion, you may be requested to send your snap-shot to Tech-Line for further analysis. If this becomes necessary, follow the instructioninthetrainingaidshownbelow.ThisarticlecoversbothHDSandi-HDS.

NOTE:SelectServiceInformation>LeaveModel/Yearblank>Enterkeyword“sendingvehicle”>Click“Search”icon> Check“JobAids”checkbox.

SendingVehicleDataToTechLine(AppliestobothHDSandi-HDS)


InstructorCheckpoint3You will now need to demonstrate your interpretation of the torque converter snapshot data to your instructor.

14. Explain why you answered “Yes” or “No”. Circle the area on the graph that supports your answer: _______________________________________________________________________________________________________________________________________________________________________________

Exit the snapshot . DO NOT save your configured settings.

Click the back arrow then select the New Vehicle Icon and exit the i-HDS.




TrainingAidTorque Converter OperationAppliesto6ATandGenerationIICVTwithtorqueconverterComponents:The Housing, or Cover, is the outer shell of the torque converter, consisting of two halves welded together.It contains the Pump Impeller in the back half, and the Lock-up Clutch friction surface in the front half.These are the blue and black components in the Torque Converter cutaway.

Lock-up ClutchFriction Surface

T/ Conv Housing

Engine Side

Pump Impeller(Integrated Into Housing)




Torque Converter OperationComponents:The hub of the Housing engages with the Oil Pump Drive splines to power the Transmission Oil Pump and generate line pressure for the transmission hydraulic circuit.TECHNOTE:Torqueconvertersplinesnotfullyseatedcancauseextensivedamagetotransmissionandtorqueconverter.

TrainingAid




TrainingAidTorque Converter OperationComponents:

● The Pump Impeller spins at engine speed and consists of a series of curved vanes permanently fixed to the inside of the housing, which is bolted to the engine drive plate.

● When the engine turns the torque converter, the pump blades push the fluid towards the turbine. ● As the fluid enters the turbine, the fluid gives the blades a push downward. This rotates the turbine in the same direction as the pump.

The Pump Impeller is the blue component in the Torque Converter cutaway.

T/ Conv Housing

Engine Side

Pump Impeller(Integrated Into Housing)





● The Turbine sits inside the torque converter, supported by bearings. ● The Turbine consists of series of vanes, similar to the Pump Impeller. ● This is the yellow component in the cutaway Torque converter.

ThecenteroftheTurbineissplinedtotheInput/MainShafttosendtorqueintothetransmission.Turbine

Input Shaft

The center of the Turbin splines to the Input Shaft to send torque in the transmission.





● The Stator consists of a third set of vanes, situated between the Converter Pump (impeller)and the Turbine. ● The Stator acts to redirect fluid from the Turbine, back to the Converter Pump allowing the fluid to contact the vanes of the pump in the direction of normal

rotation. This helps the pump turn and increases fluid flow back to the turbine thereby multiplying the torque applied to the mainshaft of the transmission. ● The Stator is mounted on a One-Way Clutch, splined to the Stator Reaction shaft which engages an internal valve body. Stator Reaction is described on the

next page.

This is the red component in the cutaway torque converter.

Stator

Stator One-Way Clutch

Stator Flange (Mounted in Case)

Transmission Side

EngineSide




TrainingAidTorque Converter OperationStatorControlOfTheRegulator:The Stator is also used to control transmission line pressure through the regulator valve. When the pump speed is higher than turbine speed, as when accelerating or climbing a hill, the increased load on the stator locks it to the reaction shaft. An arm on the end of the stator reaction shaft pushes on the stator reaction spring cap. This compresses the stator reaction spring and the regulator spring inside…increasing the fluid pressure required to move the regulator valve…thus line pressure is increased.This increased pressure is necessary to operate the clutches under load and to allow more ATF to flow for increased cooling under acceleration or heavy loads.When the load comes off the stator, it unlocks from the reaction shaft and the stator reaction spring pushes the arm back, lowering line pressure.

Stator shaft arm

Stator

Regulator valve

Regulator valve body

Torque converter

Stator shaft

Regulator spring cap





● The Lock-up Clutch acts to directly couple the Turbine to the Housing, and thus the engine. ● The Lock-up Clutch can either be a friction strip bonded to the backside of the turbine, or multiple friction discs applied with a piston. ● The Lock-up Clutch is connected to the Turbine through the Damper assembly ● The Damper assembly uses springs to reduce unwanted engine vibration from reaching the drivetrain. ● The Lock-up Clutch is supplied with control pressure from the transmission through the Input Shaft.

This is the yellow component in the cutaway Torque Converter.

Lockup Clutch

(Mounted in Housing)

Damper Comp

EngineSide




TrainingAidTorque Converter OperationLock-UpClutchControl:Locking of the torque converter can be harsh and felt by the driver unless it is modified by hydraulic or electronic controls. In addition to full lock-up there is a region where lock-up is applied gradually for smoother engagement.This allows smoother shifting without loss of torque multiplication. These earlier lock-up regions should not be felt by the driver.On electronically controlled transmissions, this region of lock-up is controlled by a shift solenoid valve and a clutch pressure control solenoid (CPC) valve. Each of these valves are controlled by the PCM/TCM.Operation(clutchoff)With the lock-up clutch off, oil flows in the reverse of CLUTCH ON. As a result, the lock-up piston is moved away from the converter cover; that is, the torque converter lock-up is released.

Operation(clutchon)With the lock-up clutch on, the oil in the chamber between the converter cover and lock-up piston is discharged. Torque converter pressure is exerted against the front side of the piston. As a result, the converter turbine is locked on the converter cover firmly. The effect is to bypass the converter, thereby placing the car in direct drive.Power flow

Power flow

EngineEngine

Drive Plate Drive Plateto Oil Cooler to Oil Cooler

Outlet OutletInlet InletTorque converter

cover

Torque converter

cover

Pump

Lock-up piston

Damper spring

Turbine

Turbine

MainshaftMainshaft




TrainingAidTorque Converter OperationOperation:Lock-upModeThe Lock-up Clutch is activated or deactivated using a combination of shift valve solenoids and clutch pressure control valves.The shift valve turns the hydraulic circuit ON/OFF.The clutch pressure control valve regulates the hydraulic pressure, determining the degree of lockup force.




TrainingAidTorque Converter OperationOperation:PowerandFluidFlowModeSummary

Mode Turbine vsPump Speed Stator Torque Rotary Flow Vortex

Flow

Torque Multiplier Slower Locked Increased Low High

Fluid Coupling Slightly Slower Free Approx. Equal High Low

Lockup Equal Free Equal High Low

Documents

ATS26 - Torque Converter Operation/Diagnosis Automobile