DIAGNOSIS AND TESTING - JustAnswer - About Us ...ww2.justanswer.com/uploads/sdcrowder/2010-09-08_235032...2010/09/08 · present, INSTALL a new ABS module. REFER to Anti-Lock Brake

206-09-1 206-09-1Vehicle Dynamic Systems

DIAGNOSIS AND TESTING

During the ABS operation, the driver may feel aAnti-Lock Controlpulsation in the brake pedal, accompanied by a

Special Tool(s) slight up and down movement in the pedal height.In addition, a mechanical noise from the engine73III Automotive Metercompartment may be heard. The pedal effort and105-R0057 or equivalentpedal feel during normal braking are similar to thatof a conventional power brake system.

When the brakes are applied, brake fluid is forcedfrom the brake master cylinder outlet ports to theHydraulic Control Unit (HCU) inlet ports. The fluidpressure is transmitted through 3 normally openFlex Probe Kit

105-R025B or equivalent solenoid valves inside the HCU, through the outletports of the HCU to the brakes. One circuit of thebrake master cylinder feeds the front brakes whilethe other circuit feeds the rear brakes. If the ABSmodule senses that a wheel is about to lock, basedon wheel speed sensor data, the inlet solenoid valvepulses closed, preventing more fluid from enteringRotunda Active Wheel Speed

Sensor Tester that circuit. The ABS module then reads the sensor105-R0110 signal from the affected wheel again. If the wheel is

still decelerating, the normally closed inlet solenoidvalve for that circuit is opened. A controlled amountof hydraulic pressure between the normally openinlet valve and the brake is relieved into the HCUaccumulator. Once the affected wheel returns toVehicle Communication Modulevehicle speed, the ABS module returns the solenoid(VCM) and Integrated

Diagnostic System (IDS) valves to their normal condition, allowing fluid flowsoftware with appropriate to the affected brake.hardware, or equivalent scan

The ABS module monitors the electromechanicaltoolcomponents of the system. Malfunction of the ABScauses the ABS module to shut off or inhibit thesystem. However, normal power-assisted brakingPrinciples of Operation remains. Malfunctions are indicated by the yellowABS warning indicator in the instrument cluster.Anti-Lock ControlThe ABS is self-monitoring. When the ignitionThe ABS prevents wheel lockup by automaticallyswitch is placed in the RUN position, the ABSmodulating the brake pressure during an emergencymodule carries out a preliminary self-check on thestop. By not locking the wheels, the driver cananti-lock electrical system indicated by a 3-secondimprove steering control during hard braking andillumination of the yellow ABS warning indicatorstop the vehicle in the shortest possible distancein the instrument cluster.under most conditions.If the GVW is over 4,535 kg (10,000 lb), theThe ABS controls both front and rear brakeswarning indicator may remain on until the vehicle isseparately. The brake pedal force required to engagedriven at a speed above 24 km/h (15 mph) for 10the ABS function may vary with the road surfaceseconds. Bringing the vehicle up to this speedcondition. A dry surface requires greater force thanenables a system self-check that turns the indicatora slippery surface.off if no fault conditions are present.

Copyright 2007, Ford Motor CompanyLast updated: 01/02/2007 2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)

Visual Inspection ChartA self-test of the solenoid valve coils and the pumpmotor is carried out when the vehicle is started. Mechanical ElectricalDuring starting, the brake pedal must be released to

• Base brake system • Battery Junction Boxrun the self-test. If the brake pedal is applied or a • Tire pressure (BJB) fuse(s):failed brake switch occurs, the self-test is run at 6 • Tire size or mismatched — 6 (40A)km/h (4 mph) regardless of brake pedal position. tires — 9 (40A)

• Hydraulic Control Unit — 13 (5A)Engine Only Traction Control (HCU) — 77 (10A)

• Wheel speed sensor ring • Smart Junction BoxSome vehicles may be equipped with an Engine • Rear axle speed sensor (SJB) 35 (10A)Only Traction Control (EOTC) system. In order to ring • Wiring, terminals orachieve maximum traction, the EOTC system is connectors

• Wheel speed sensordesigned to limit wheel spin by modulating engine• Rear axle speed sensortorque when driving on slippery or loose surfaces.• Traction control switchEngine torque modulation is achieved by regulating• ABS module

fuel and spark to the cylinders. This means that thetraction control system is controlled by the PCM

4. NOTE: Make sure to use the latest scan tooland not the ABS module. The only function of thesoftware release.ABS module in an EOTC system is to provide

wheel speed information to the PCM along the High If the cause is not visually evident, connect theSpeed Controller Area Network (HS-CAN) bus. The scan tool to the Data Link Connector (DLC).PCM uses the wheel speed information to determine

5. NOTE: The Vehicle Communication Modulewhen traction control is needed.(VCM) LED prove out confirms power and

The traction control system can be disabled by ground from the DLC are provided to thepressing the traction control switch (located on the VCM.instrument panel center finish panel) and is

If the scan tool does not communicate with theindicated by the yellow traction control indicatorVCM:light on the switch. The traction control system• check the VCM connection to the vehicle.will reset and return to normal operation when the

ignition switch is cycled or when the traction • check the scan tool connection to the VCM.control switch is pressed and released a second time • refer to Section 418-00, No Power To Theduring the same ignition cycle. Scan Tool, to diagnose no power to the scanThe traction control system is contained in the PCM tool.and is configured when the PCM is configured. 6. If the scan tool does not communicate with theRefer to Programmable Module Installation (PMI) vehicle:in Section 418-01.

• Verify the ignition key is in the ONInspection and Verification position.

NOTE: If a new ABS module is installed, it must • Verify the scan tool operation with a knownbe configured. Refer to Programmable Module good vehicle.Installation (PMI) in Section 418-01. • Refer to Section 418-00 to diagnose no1. Verify the customer concern. response from the PCM.

2. Verify the stoplamps operate correctly by 7. Carry out the network test.applying and releasing the brake pedal with the • If the scan tool responds with noignition switch in the OFF position. If the communication for one or more modules,stoplamps do not operate correctly, refer to refer to Section 418-00 to diagnose the noDiagnosis and Testing in Section 417-01. If the communication concern.stoplamps operate correctly, proceed to the next

• If the network test passes, retrieve andstep.record continuous memory DTCs.

3. Visually inspect for obvious signs of8. Clear the continuous DTCs and carry out themechanical or electrical damage.

self-test diagnostics for the ABS module.

2008 F-250, 350, 450, 550 Super Duty, 7/2007



9. If the DTCs retrieved are related to the concern, 10. If no DTCs related to the concern are retrieved,go to the ABS Module DTC Chart. For all GO to Symptom Chart.other DTCs, refer to the Master DTC Chart inSection 419-10.

DTC Charts

ABS Module DTC Chart

DTC Description Source Action

B1317 Battery Voltage High ABS Module GO to Pinpoint Test A.

B1318 Battery Voltage Low ABS Module GO to Pinpoint Test A.

B1342 ECU is Faulted ABS Module REPAIR all other DTCs beforediagnosing B1342. CLEAR the DTCs.TEST the system for normal operation. Ifthe DTC returns, INSTALL a new ABSmodule. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.

B2477 Module Configuration Failure ABS Module CONFIGURE the ABS module. REFERto Programmable Module Installation(PMI) in Section 418-01. CLEAR theDTCs. REPEAT the self-test. If DTCB2477 is retrieved again, INSTALL anew ABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. REPEAT the self-test.

B2900 VIN Mismatch ABS Module GO to Pinpoint Test F.

C1095 ABS Hydraulic Pump Motor Circuit ABS Module GO to Pinpoint Test B.Failure

C1096 ABS Hydraulic Pump Motor Circuit ABS Module GO to Pinpoint Test B.Open

C110A ABS Active Circuit Short to Battery ABS Module If any other non-communication DTCsare present (except for B1342), diagnosethose DTCs first. CLEAR all DTCs.DRIVE the vehicle. If the DTC is stillpresent, INSTALL a new ABS module.REFER to Anti-Lock Brake System(ABS) Module in this section. CARRYOUT the self-test with the brake pedalnot applied.

C1115 ABS Power Relay Output Short Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Ifto Battery DTC C1115 is retrieved again, INSTALL

a new ABS module. REFER toAnti-Lock Brake System (ABS) Modulein this section. CARRY OUT theself-test with the brake pedal notapplied.

C1145 Wheel Speed Sensor RF Input Circuit ABS Module GO to Pinpoint Test C.Failure

C1155 Wheel Speed Sensor LF Input Circuit ABS Module GO to Pinpoint Test C.Failure

C1175 Wheel Speed Sensor Rear Input Circuit ABS Module GO to Pinpoint Test C.Failure

2008 F-250, 350, 450, 550 Super Duty, 7/2007



ABS Module DTC Chart (Continued)


C1185 ABS Power Relay Output Circuit Failure ABS Module CLEAR all DTCs. If DTC C1185 isretrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CARRY OUT the self-test with the brakepedal not applied.

C1194 ABS Outlet Valve Coil LF Circuit ABS Module CLEAR all DTCs. If DTC C1194 isFailure retrieved again, INSTALL a new ABS

module. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CARRY OUT the self-test with the brakepedal not applied.

C1198 ABS Inlet Valve Coil LF Circuit Failure ABS Module CLEAR all DTCs. If DTC C1198 isretrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CARRY OUT the self-test with the brakepedal not applied.

C1210 ABS Outlet Valve Coil RF Circuit ABS Module CLEAR all DTCs. If DTC C1210 isFailure retrieved again, INSTALL a new ABS

module. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CARRY OUT the self-test with the brakepedal not applied.

C1214 ABS Inlet Valve Coil RF Circuit Failure ABS Module CLEAR all DTCs. If DTC C1214 isretrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CARRY OUT the self-test with the brakepedal not applied.

C1222 Wheel Speed Mismatch ABS Module GO to Pinpoint Test D.

C1233 Wheel Speed Sensor LF Input Signal ABS Module GO to Pinpoint Test D.Missing

C1234 Wheel Speed Sensor RF Input Signal ABS Module GO to Pinpoint Test D.Missing

C1237 Wheel Speed Sensor Rear Input Signal ABS Module GO to Pinpoint Test D.Missing

C1242 ABS Outlet Valve Coil LR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure the DTC is still present, INSTALL a new

ABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1246 ABS Outlet Valve Coil RR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure the DTC is still present, INSTALL a new


2008 F-250, 350, 450, 550 Super Duty, 7/2007





C1250 ABS Inlet Valve Coil LR Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. Ifthe DTC is still present, INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1254 ABS Inlet Valve Coil RR Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. Ifthe DTC is still present, INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1329 ABS Valve Outlet Coil Over RF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1330 ABS Valve Outlet Coil Over LR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1331 ABS Valve Outlet Coil Over RR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1332 ABS Valve Outlet Coil Over LF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1333 ABS Valve Inlet Coil Over RF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1334 ABS Valve Inlet Coil Over LR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1335 ABS Valve Inlet Coil Over RR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


2008 F-250, 350, 450, 550 Super Duty, 7/2007





C1336 ABS Valve Inlet Coil Over LF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature the DTC is still present, INSTALL a new


C1446 Brake Switch Circuit Failure ABS Module GO to Pinpoint Test E.

U0073 CAN Bus Off-Transmit Error ABS Module If any non-communication DTCs arepresent, diagnose those DTCs first.CLEAR all DTCs. DRIVE the vehicle. Ifthe DTC is still present, INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

U0115 Lost Communication With ECM/PCM - ABS Module If any non-communication DTCs areSecondary (SPCM) present, diagnose those DTCs first.

CLEAR all DTCs. DRIVE the vehicle. Ifthe DTC is still present, REFER toSection 418-00 to diagnose the HighSpeed Controller Area Network(HS-CAN) bus.

U0155 Lost Communication With Instrument ABS Module If any non-communication DTCs arePanel Cluster (IC) Control Module present, diagnose those DTCs first.

CLEAR all DTCs. DRIVE the vehicle. Ifthe DTC is still present, REFER toSection 418-00 to diagnose the HS-CANbus.

U2050 No Application Present ABS Module CONFIGURE the ABS module. REFERto Programmable Module Installation(PMI) in Section 418-01. CLEAR theDTCs. RETRIEVE the DTCs andVERIFY successful moduleconfiguration. If DTC U2050 is retrievedagain, INSTALL a new ABS module.REFER to Anti-Lock Brake System(ABS) Module in this section. CLEARthe DTC. REPEAT the self-test.

U2051 One or More Calibration Files Missing or ABS Module CLEAR the DTCs. CARRY OUT theCorrupt ABS module self-test. RETRIEVE and

RECORD any DTCs. If DTC U2051 isretrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CLEAR the DTC. REPEAT the self-test.

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Symptom Chart

Symptom Chart

Condition Possible Sources Action• No communication with the • Fuse(s) • REFER to Section 418-00 to

ABS module • Wiring, terminals or diagnose the noconnectors communication concern.

• ABS module• The red brake warning • Wiring, terminals or • REFER to Section 413-01 to

indicator is never on connectors diagnose the instrument• Instrument cluster cluster.

• The yellow ABS warning • Instrument cluster • RETRIEVE all ABS moduleindicator and the red brake • ABS module DTCs and GO to the ABSwarning indicator are Module DTC Chart. If noilluminated DTCs are present, REFER to

Section 413-01 to diagnosethe instrument cluster.

• Soft or excessive pedal travel • Hydraulic leak in brake line • ELIMINATE base brakeor hose, fitting, master system as cause of problem.cylinder or caliper REFER to Diagnosis and

• Air in brake system Testing in Section 206-00.• Hydraulic Control Unit • GO to Pinpoint Test G.

(HCU)• The traction control system is • Traction control system is • GO to Pinpoint Test H.

inoperative turned off• Smart Junction Box (SJB)

fuse 35 (10A)• Traction control system is not

configured• Wiring, terminals or

connectors• Traction control switch• ABS wheel speed sensor fault• High Speed Controller Area

Network (HS-CAN) bus fault• PCM

• The traction control indicator • Wiring, terminals or • GO to Pinpoint Test I.is always on connectors

• The traction control system • SJB fuse 35 (10A) • GO to Pinpoint Test H.cannot be disabled/enabled • Wiring, terminals or

connectors• Traction control switch• PCM

Pinpoint Tests Normal OperationThe voltage required for correct ABS operation is

Pinpoint Test A: DTCs B1317 and B1318 10-16 volts. Above or below that voltage range andRefer to Wiring Diagrams Cell 42, Vehicle DTC B1317 (battery voltage high) or B1318Dynamic Systems for schematic and connector (battery voltage low) will be set.information.

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Fused battery voltage for the Hydraulic Control Unit • DTC B1318 Battery Voltage Low — When(HCU) pump is supplied to the ABS module by vehicle speed is greater than 10 km/h (6 mph), ifBattery Junction Box (BJB) fuse 6 (40A) along the battery or charging system voltage dropscircuit SBB06 (BN/RD). Fused battery voltage for below 10 volts, DTC B1318 will be set.the HCU coils is supplied to the ABS module by This pinpoint test is intended to diagnoseBJB fuse 9 (40A) along circuit SBB09 (RD). Fused the following:ignition voltage for the ABS module is supplied by

• Wiring, terminals or connectorsBJB fuse 77 (10A) along circuit CBB77 (WH).• Charging systemGround for the HCU pump, coil and ABS module

is provided along circuit GD163 (BK/GY). • ABS module

• DTC B1317 Battery Voltage High — Whenvehicle speed is greater than 10 km/h (6 mph), ifthe battery or charging system voltage exceeds 16volts, DTC B1317 will be set.

PINPOINT TEST A: DTCs B1317 AND B1318

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiringterminals. Do not use standard multi-meter probes.

NOTE: DTC B1317, B1318 or B1676 can be set if the vehicle has been recently jump started,the battery has been recently charged or the battery has been discharged. The battery maybecome discharged due to excessive load(s) on the charging system from aftermarketaccessories or if the battery has been left unattended with the accessories on.

NOTE: Carry out a thorough inspection and verification before proceeding with the pinpointtest. Refer to Inspection and Verification in this section.

Test Step Result / Action to TakeA1 RETRIEVE ALL CMDTCs IN ALL MODULES

• Ignition ON. Yes• Enter the following diagnostic mode on the scan tool: Self-Test REFER to Section 414-00 for diagnosis of— All CMDTCs. the battery and charging system.• Is B1317, B1318 or B1676 present in one or more modulesAND P0563, P0620, P0625, P0626 or P065B present in the NoPCM? GO to A2.

A2 CHECK BATTERY CONDITION• Ignition OFF. Yes• Refer to Section 414-01 and carry out the Battery — Condition If the battery passed the condition test but

Test. required a recharge, REFER to Section• Does the battery pass the condition test? 414-00 to diagnose the charging system.

CLEAR all Continuous MemoryDiagnostic Trouble Codes (CMDTCs).TEST the system for normal operation.If the battery passed the condition test anddid not require a recharge, GO to A3.NoINSTALL a new battery. CLEAR allCMDTCs. TEST the system for normaloperation.

A3 CHECK THE CHARGING SYSTEM VOLTAGENOTE: Do not allow the engine rpm to increase above 2,000 rpmwhile performing this step or the generator may self excite andresult in default charging system output voltage. If engine rpm hasgone above 2,000 rpm, shut the vehicle OFF and restart theengine before performing this step.• Start the engine.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST A: DTCs B1317 AND B1318 (Continued)

Test Step Result / Action to TakeA3 CHECK THE CHARGING SYSTEM VOLTAGE (Continued)

• Measure the voltage of the battery:— For DTC B1317, turn off all accessories and run the engine

at 1,500 rpm for a minimum of 2 minutes.— For DTC B1318, turn on headlights and HVAC fan on high

and run engine at 1,500 rpm for a minimum of 2 minutes.

YesFor DTC B1318, GO to A4.For DTC B1317, GO to A6.NoREFER to Section 414-00 to diagnose thecharging system. CLEAR all CMDTCs.

• Is the battery voltage between 13-15.2 volts? TEST the system for normal operation.A4 CHECK THE VOLTAGE TO THE ABS MODULE

• Ignition OFF.• Disconnect: ABS Module C135.• Ignition ON.• Measure the voltage between ground and:

— ABS module C135-2, circuit SBB09 (RD), harness side.— ABS module C135-31, circuit SBB06 (BN/RD), harness side.— ABS module C135-32, circuit CBB77 (WH), harness side.

YesGO to A5.NoFor circuit SBB09 (RD), VERIFY BJB fuse9 (40A) is OK.For circuit SBB06 (BN/RD), VERIFY BJBfuse 6 (40A) is OK.For circuit CBB77 (WH), VERIFY BJB fuse77 (10A) is OK.If the fuse(s) is OK, REPAIR the affectedcircuit(s).If any fuse is not OK, REFER to theWiring Diagrams Manual to identify thepossible causes of the circuit short.

• Are the voltages greater than 10 volts? CLEAR the DTCs. REPEAT the self-test.A5 CHECK CIRCUIT GD163 (BK/GY) FOR AN OPEN

• Ignition OFF.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST A: DTCs B1317 AND B1318 (Continued)

Test Step Result / Action to TakeA5 CHECK CIRCUIT GD163 (BK/GY) FOR AN OPEN (Continued)

• Measure the resistance between ground and:— ABS module C135-16, circuit GD163 (BK/GY), harness side.— ABS module C135-45, circuit GD163 (BK/GY), harness side.

YesGO to A6.NoREPAIR the affected circuit(s). CLEAR the

• Are the resistances less than 5 ohms? DTCs. REPEAT the self-test.A6 CHECK THE ABS MODULE CONNECTORS

• Disconnect the ABS connector. Yes• Check for: INSTALL a new ABS module. REFER to

— corrosion. Anti-Lock Brake System (ABS) Module in— pushed-out pins. this section. CLEAR the DTCs. REPEAT— spread terminals. the self-test.

• Connect the ABS connector and make sure that it is seated Nocorrectly. The system is operating correctly at this• Operate the system and verify the concern is still present. time. The concern may have been caused• Is the concern still present? by a loose or corroded connector. CLEARthe DTCs. REPEAT the self-test.

Pinpoint Test B: DTCs C1095 and C1096 When the ignition key is turned to the ON position,the ABS module commands the HCU pump on forNormal Operation100 ms (±6 ms) and is then commanded off. After 6Fused battery voltage for the Hydraulic Control Unitms, the ABS module will read the voltage that is(HCU) pump motor is supplied to the ABS modulebeing generated by the HCU pump. If the voltageby Battery Junction Box (BJB) fuse 6 (40A) alongindicates the motor is spinning at less than 500 rpm,circuit SBB06 (BN/RD). Ground for the HCUthere may be a locked motor. If this condition ispump, coil and ABS module is provided alongdetected 4 times, DTC C1095 is set. The pumpcircuit GD163 (BK/GY). The ABS module suppliesmotor is checked for an open circuit 2 seconds afterthe voltage and ground for the pump motor. The 2the most recent successful pump motor offcomponents are hardwired together, there are nocommand. If the pump motor feedback remainsconnectors or wiring harnesses between the 2greater than 0.75 volt for more than 50 ms (±6 ms)components.after these conditions have been met, DTC C1096 isset.

• DTC C1095 ABS Hydraulic Pump Motor CircuitFailure — If a short to voltage or ground isdetected, if a locked up pump motor is detected orif there is an internal failure of the ABS module,DTC C1095 will be set.

• DTC C1096 ABS Hydraulic Pump Motor CircuitOpen — If a short to voltage, a short to groundor an open is detected, if a locked up pump motoris detected or if there is an internal failure of theABS module, DTC C1095 will be set.

2008 F-250, 350, 450, 550 Super Duty, 7/2007



This pinpoint test is intended to diagnosethe following:

• Wiring, terminals or connectors

• Hydraulic pump motor

• ABS module

PINPOINT TEST B: DTCs C1095 AND C1096


Test Step Result / Action to TakeB1 CHECK FOR ABS MODULE ON-DEMAND DTCs

• Connect the scan tool.• Ignition ON.• Using the scan tool, clear all ABS module DTCs.• Ignition OFF. Yes• Ignition ON. GO to B2.• Enter the following diagnostic mode on the scan tool: Self-Test

— ABS Module. No• Retrieve and record all ABS module DTCs. For all other DTCs, GO to the ABS• Is DTC C1095 or C1096 present? Module DTC Chart.

B2 CHECK THE ABS PUMP MOTOR• Ignition ON. Yes• Is the ABS pump motor running all the time? INSTALL a new ABS module and HCU.

REFER to Anti-Lock Brake System (ABS)Module and Hydraulic Control Unit (HCU)in this section. CALIBRATE the ABSmodule. FOLLOW the scan tool directionsfor the calibration procedure. CLEAR theDTCs. CARRY OUT the self-test with thebrake pedal not applied.NoGO to B3.

B3 CHECK ABS PUMP MOTOR CONTROL OUTPUT COMMAND(ABS MTR)• Enter the following diagnostic mode on the scan tool: Yes

DataLogger — ABS Module. TOGGLE the ABS MTR output command• Toggle the ABS MTR output command ON. OFF. GO to B4.• Does the HCU pump motor run for approximately 2 Noseconds? TOGGLE the ABS MTR output command

OFF.CLEAR the DTCs. CYCLE the ignitionswitch. RETRIEVE and RECORD the ABSmodule DTCs.If DTC C1095 is retrieved, GO to B5.If DTC C1096 is retrieved, INSTALL a newABS module. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CALIBRATE the ABS module. FOLLOWthe scan tool directions for the calibrationprocedure. CLEAR the DTCs. CARRYOUT the self-test with the brake pedal notapplied.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST B: DTCs C1095 AND C1096 (Continued)

Test Step Result / Action to TakeB4 CHECK FOR RETURNING ABS MODULE DTCs

• Using the scan tool, clear all ABS module DTCs. Yes• Cycle the ignition switch and test drive the vehicle above 32 If DTC C1096 is present, GO to B7.

km/h (20 mph). If DTC C1095 is present, INSTALL a new• Enter the following diagnostic mode on the scan tool: Self-Test HCU. REFER to Hydraulic Control Unit

— ABS Module. (HCU) in this section. CLEAR the DTCs.• Are any DTCs present? REPEAT the self-test.

For all other ABS module DTCs, GO tothe ABS Module DTC Chart.NoThe system is operating correctly at thistime. The concern may have been causedby a loose or corroded connector. CLEARthe DTCs. CARRY OUT the self-test withthe brake pedal not applied.

B5 CHECK THE VOLTAGE TO THE ABS MODULE FOR PUMPMOTOR ACTIVATION• Ignition OFF.• Disconnect: ABS Module C135.• Measure the voltage between ABS module C135-31, circuit

SBB06 (BN/RD), harness side and ground.

YesGO to B6.NoVERIFY BJB fuse 6 (40A) is OK. If OK,REPAIR circuit SBB06 (BN/RD). If not OK,REFER to the Wiring Diagrams Manual toidentify the possible causes of the circuitshort. CLEAR the DTCs. REPEAT the

• Is the voltage greater than 10 volts? self-test.B6 CHECK CIRCUIT GD163 (BK/GY) FOR AN OPEN

• Ignition OFF.• Measure the resistance between ground and:

— ABS module C135-16, circuit GD163 (BK/GY), harness side.— ABS module C135-45, circuit GD163 (BK/GY), harness side.

YesGO to B7.NoREPAIR circuit GD163 (BK/GY). CLEAR

• Are the resistances less than 5 ohms? the DTCs. REPEAT the self-test.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST B: DTCs C1095 AND C1096 (Continued)

Test Step Result / Action to TakeB7 CHECK FOR CORRECT ABS MODULE OPERATION

• Disconnect: ABS Module C135. Yes• Check the ABS connector for: INSTALL a new ABS module. REFER to

Anti-Lock Brake System (ABS) Module in— corrosion. this section. CALIBRATE the ABS module.— pushed-out pins. FOLLOW the scan tool directions for the— spread terminals. calibration procedure. CLEAR the DTCs.• Connect the ABS connector and make sure that it seats CARRY OUT the self-test with the brakecorrectly. pedal not applied.• Operate the system and verify the concern is still present.• Is the concern still present? No

The system is operating correctly at thistime. The concern may have been causedby a loose or corroded connector. CLEARthe DTCs. CARRY OUT the self-test withthe brake pedal not applied.

Pinpoint Test C: DTCs C1145 (RF), C1155 • DTC C1155 Wheel Speed Sensor LF Input Circuit(LF), C1175 (REAR) Failure — When the vehicle speed exceeds 5

km/h (3 mph), if the ABS module detects anRefer to Wiring Diagrams Cell 42, Vehicleopen, short to ground or voltage or a defective LFDynamic Systems for schematic and connectorwheel speed sensor trigger circuit, DTC C1155information.will be set.

Normal Operation• DTC C1175 Wheel Speed Sensor Rear InputThe active wheel speed sensors generate a square

Circuit Failure — When the vehicle speedwave signal that is sent to the ABS module. Theexceeds 5 km/h (3 mph), if the ABS modulewheel speed sensor circuitry connects to the ABSdetects an open, short to ground or voltage or amodule through 2 wires and a connector at eachdefective rear wheel speed sensor trigger circuit,wheel speed sensor. When the ignition is turned toDTC C1175 will be set.the RUN position, the ABS module carries out a

self-test by sending a reference voltage to all of the This pinpoint test is intended to diagnosethe following:wheel speed sensors and their circuitry to determine

if they are functional. • Wiring, terminals or connectorsVoltage and ground signals are supplied to the • Wheel speed sensorwheel speed sensors from the ABS module.

• ABS module• DTC C1145 Wheel Speed Sensor RF Input

Circuit Failure — When the vehicle speedexceeds 5 km/h (3 mph), if the ABS moduledetects an open, short to ground or voltage or adefective RF wheel speed sensor trigger circuit,DTC C1145 will be set.

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST C: DTCs C1145 (RF), C1155 (LF), C1175 (REAR)


Test Step Result / Action to TakeC1 CHECK FOR FAULT REPEATABILITY

NOTE: Both circuits must be checked for each DTC. YesIf the Rotunda Active Wheel Speed• Connect the scan tool.Sensor Tester is not available, GO to C4.• Enter the following diagnostic mode on the scan tool: Clear the

CMDTCs. If the Rotunda Active Wheel Speed• Drive the vehicle at least 16 km/h (10 mph). Sensor Tester is available, GO to C2.• Retrieve and document Continuous Memory Diagnostic Trouble NoCodes (CMDTCs). INSPECT the wheel speed sensors, wheel• Is DTC C1145, C1155 or C1175 retrieved? speed sensor wiring and wheel speed

sensor tone rings. REPAIR or INSTALLnew as necessary. If any other DTCs areretrieved, GO to the ABS Module DTCChart.

C2 CHECK THE ABS MODULE OUTPUT USING THE ROTUNDAACTIVE WHEEL SPEED SENSOR TESTER• Ignition OFF.• Disconnect: Suspect Wheel Speed Sensor.• Connect the Rotunda Active Wheel Speed Sensor Tester to the

wheel speed sensor connectors. Yes• Ignition ON. GO to C3.• Select the correct system polarity on the tester and turn thetester power switch to the ON position. No

• Is the module output LED illuminated? GO to C6.C3 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE

ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER• Raise the suspect wheel until it can spin freely. Refer to Section Yes

100-02. The system is operating correctly at this• While monitoring the Rotunda Active Wheel Speed Sensor time. The concern may have been caused

Tester, slowly spin the suspect wheel. by a loose or corroded connector. CLEAR• Do the tester output LEDs illuminate and flash and is the the DTCs. REPEAT the self-test.

current overload LED not illuminated? NoIf the current level LED is not illuminatedand the sensor output LEDs do notilluminate or if the current level LED isilluminated red, INSTALL a new wheelspeed sensor. For the front wheel speedsensor, REFER to Wheel Speed Sensor— Front, Rear Wheel Drive (RWD) orWheel Speed Sensor — Front, FourWheel Drive (4WD) in this section. For therear wheel speed sensor, REFER toWheel Speed Sensor — Rear in thissection. CLEAR the DTCs. REPEAT theself-test.If the current level LED is not illuminatedand the sensor output LEDs illuminategreen but do not flash, INSPECT thewheel speed sensor tone ring andINSTALL new if necessary. If the tone ringis OK, INSTALL a new wheel speedsensor. For the front wheel speed sensor,REFER to Wheel Speed Sensor — Front,Rear Wheel Drive (RWD) or Wheel SpeedSensor — Front, Four Wheel Drive (4WD)in this section. For the rear wheel speedsensor, REFER to Wheel Speed Sensor— Rear in this section. CLEAR the DTCs.REPEAT the self-test.

C4 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORTTO VOLTAGENOTE: Both circuits must be checked for each DTC.• Ignition OFF.• Disconnect: ABS Module C135.

(Continued)

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DIAGNOSIS AND TESTING (Continued)PINPOINT TEST C: DTCs C1145 (RF), C1155 (LF), C1175 (REAR) (Continued)

Test Step Result / Action to TakeC4 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT

TO VOLTAGE (Continued)

• Disconnect: Suspect Wheel Speed Sensor.• Ignition ON.• For DTC C1145: measure the voltage between ground and:

— ABS module C135-26, circuit VCA05 (GY/VT), harness side.— ABS module C135-27, circuit RCA19 (VT), harness side.

• For DTC C1155: measure the voltage between ground and:— ABS module C135-12, circuit VCA03 (VT/WH), harness

side.— ABS module C135-13, circuit RCA17 (YE), harness side.

• For DTC C1175: measure the voltage between ground and: Yes— ABS module C135-42, circuit VCA07 (BU/OG), harness REPAIR the affected circuit(s). CLEAR theside. DTCs. REPEAT the self-test.— ABS module C135-41, circuit RCA21 (BN/GN), harnessside. No

• Is any voltage present? GO to C5.C5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT

TO GROUND• Ignition OFF.• For DTC C1145: measure the resistance between ground and:

— ABS module C135-26, circuit VCA05 (GY/VT), harness side.— ABS module C135-27, circuit RCA19 (VT), harness side.

• For DTC C1155: measure the resistance between ground and:— ABS module C135-12, circuit VCA03 (VT/WH), harness

side.— ABS module C135-13, circuit RCA17 (YE), harness side.

• For DTC C1175: measure the resistance between ground and: Yes— ABS module C135-42, circuit VCA07 (BU/OG), harness GO to C6.side.— ABS module C135-41, circuit RCA21 (BN/GN), harness No

side. REPAIR the affected circuit(s). CLEAR the• Are the resistances greater than 10,000 ohms? DTCs. REPEAT the self-test.

C6 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN• Ignition OFF.• Disconnect: ABS Module C135.• Disconnect: Suspect Wheel Speed Sensor.• For DTC C1145: measure the resistance between:

— ABS module C135-26, circuit VCA05 (GY/VT), harness sideand RF wheel speed sensor C160-1, circuit VCA05(GY/VT), harness side.

— ABS module C135-27, circuit RCA19 (VT), harness side andRF wheel speed sensor C160-2, circuit RCA19 (VT),harness side.

• For DTC C1155: measure the resistance between:— ABS module C135-12, circuit VCA03 (VT/WH), harness side

and LF wheel speed sensor C150-1, circuit VCA03(VT/WH), harness side.

— ABS module C135-13, circuit RCA17 (YE), harness sideand LF wheel speed sensor C150-2, circuit RCA17 (YE),harness side.

• For DTC C1175: measure the resistance between:— ABS module C135-42, circuit VCA07 (BU/OG), harness side

and rear wheel speed sensor C455-1, circuit VCA07 Yes(BU/OG), harness side. GO to C7.— ABS module C135-41, circuit RCA21 (BN/GN), harness sideand rear wheel speed sensor C455-2, circuit RCA21 No(BN/GN), harness side. REPAIR the affected circuit(s). CLEAR the

• Are the resistances less than 5 ohms? DTCs. REPEAT the self-test.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Test Step Result / Action to TakeC7 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS

• Measure the resistance between suspect front wheel speedsensor pins, harness side.

• Measure the resistance between rear wheel speed sensor pins,harness side.

YesGO to C8.NoREPAIR the affected circuit(s). CLEAR the

• Is the resistance greater than 10,000 ohms? DTCs. REPEAT the self-test.C8 CHECK THE ABS MODULE OUTPUT

• Connect: ABS Module C135.• Ignition ON.• Measure the voltage between the suspect front wheel speed

sensor pins, harness side.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Test Step Result / Action to TakeC8 CHECK THE ABS MODULE OUTPUT (Continued)

• Measure the voltage between the rear wheel speed sensor pins,harness side.

YesINSTALL a new wheel speed sensor. Forthe front wheel speed sensor, REFER toWheel Speed Sensor — Front, RearWheel Drive (RWD) or Wheel SpeedSensor — Front, Four Wheel Drive (4WD)in this section. CLEAR the DTCs.REPEAT the self-test. For the rear wheelspeed sensor, REFER to Wheel SpeedSensor — Rear in this section. CLEAR theDTCs. REPEAT the self-test.No

• Are the voltages greater than 10 volts? GO to C9.C9 CHECK THE ABS MODULE CONNECTORS

• Disconnect the ABS connector. Yes• Check for: INSTALL a new ABS module. REFER to

— corrosion. Anti-Lock Brake System (ABS) Module in— pushed-out pins. this section. CLEAR the DTCs. REPEAT— spread terminals. the self-test.


Pinpoint Test D: DTCs C1222, C1233, C1234 Normal Operationand C1237 The wheel speed sensor and sensor ring generate a

square wave signal to the ABS module that isRefer to Wiring Diagrams Cell 42, Vehicleproportional to wheel speed. The ABS moduleDynamic Suspension for schematic and connectorcompares wheel speed inputs from all wheel speedinformation.sensors to determine an impending wheel lockup.

Voltage and ground signals are supplied to thewheel speed sensors from the ABS module.

DTC Description Fault Trigger Condition

• DTC C1222 Wheel Speed Mismatch When the vehicle speed exceeds 20 km/h (12 mph), if theABS module detects a difference between wheel speedsensor signals, DTC C1222 will be set. DTC C1222 canalso be set by damaged tone rings, mismatched wheeland/or tire sizes or driving the vehicle on one or moredeflated tires.

• DTC C1233 (LF) Input Signal Fault When the vehicle speed exceeds 20 km/h (12 mph), if the• DTC C1234 (RF) Input Signal Fault ABS module does not receive a signal from the wheel• DTC C1237 (Rear) Input Signal Fault speed sensor, the appropriate DTC will be set. These

DTCs can also be set by an excessive wheel speedsensor-to-tone ring air gap or a damaged tone ring.

This pinpoint test is intended to diagnose

2008 F-250, 350, 450, 550 Super Duty, 7/2007



the following:

• Mismatched tire sizes

• Wheel speed sensor tone ring

• Wheel speed sensor

• ABS module

PINPOINT TEST D: DTCs C1222, C1233, C1234 and C1237


Test Step Result / Action to TakeD1 RETRIEVE ABS MODULE DTCs

• Connect the scan tool. Yes• Ignition ON. GO to Pinpoint Test C.• Is DTC C1145, C1155 or C1175 present? No

If DTC C1222 is present, GO to D7.If DTC C1233, C1234 and/or C1237 ispresent and the Rotunda Active WheelSpeed Sensor Tester is available, GO toD2. If DTC C1233 or C1234 is presentand the Rotunda Active Wheel SpeedSensor Tester is not available, GO to D5.If DTC C1237 is present and the RotundaActive Wheel Speed Sensor Tester is notavailable, GO to D6.If no DTCs are present, GO to D8.

D2 CHECK THE ABS MODULE OUTPUT USING THE ROTUNDAACTIVE WHEEL SPEED SENSOR TESTER• Ignition OFF.• Disconnect: Suspect Wheel Speed Sensor.• Connect the Rotunda Active Wheel Speed Sensor Tester to the

wheel speed sensor connectors. Yes• Ignition ON. GO to D4.• Select the correct system polarity on the tester and turn thetester power switch to the ON position. No

• Is the module output LED illuminated? GO to D3.D3 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN

• For DTC C1233: measure the resistance between:— ABS module C135-12, circuit VCA03 (VT/WH), harness side

and LF wheel speed sensor C150-1, circuit VCA03(VT/WH), harness side.

— ABS module C135-13, circuit RCA17 (YE), harness sideand LF wheel speed sensor C150-2, circuit RCA17 (YE),harness side.

• For DTC C1234: measure the resistance between:— ABS module C135-26, circuit VCA05 (GY/VT), harness side

and RF wheel speed sensor C160-1, circuit VCA05(GY/VT), harness side.

— ABS module C135-27, circuit RCA19 (VT), harness side andRF wheel speed sensor C160-2, circuit RCA19 (VT),harness side.

• For DTC C1237: measure the resistance between:— ABS module C135-42, circuit VCA07 (BU/OG), harness side

and rear wheel speed sensor C455-1, circuit VCA07 Yes(BU/OG), harness side. GO to D9.— ABS module C135-41, circuit RCA21 (BN/GN), harness sideand rear wheel speed sensor C455-2, circuit RCA21 No(BN/GN), harness side. REPAIR the affected circuit(s). CLEAR the

• Are the resistances less than 5 ohms? DTCs. REPEAT the self-test.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST D: DTCs C1222, C1233, C1234 and C1237 (Continued)

Test Step Result / Action to TakeD4 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE

ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER• Raise the suspect wheel until it can spin freely. Refer to Section Yes

100-02. INSPECT the wheel speed sensor tone• While monitoring the Rotunda Active Wheel Speed Sensor ring for damage and looseness. INSTALL

Tester, slowly spin the suspect wheel. new components as necessary. If the tone• Do the tester LEDs illuminate and flash and is the current ring is OK, the concern may have been

overload LED not illuminated? caused by a loose or corroded connector.CLEAR the DTCs. REPEAT the self-test.NoIf the current level LED is not illuminatedand the sensor output LEDs do notilluminate or if the current level LED isilluminated red, INSTALL a new wheelspeed sensor. For the front wheel speedsensor, REFER to Wheel Speed Sensor— Front, Rear Wheel Drive (RWD) orWheel Speed Sensor — Front, FourWheel Drive (4WD) in this section. For therear wheel speed sensor, REFER toWheel Speed Sensor — Rear in thissection. CLEAR the DTCs. REPEAT theself-test.If the current level LED is not illuminatedand the sensor output LEDs illuminategreen but do not flash, INSPECT thewheel speed sensor tone ring andINSTALL new if necessary. If the tone ringis OK, INSTALL a new wheel speedsensor. For the front wheel speed sensor,REFER to Wheel Speed Sensor — Front,Rear Wheel Drive (RWD) or Wheel SpeedSensor — Front, Four Wheel Drive (4WD)in this section. For the rear wheel speedsensor, REFER to Wheel Speed Sensor— Rear in this section. CLEAR the DTCs.REPEAT the self-test.

D5 CHECK THE FRONT WHEEL SPEED SENSOR OUTPUT• Ignition OFF.• Disconnect: Wheel Speed Sensor C150 (LF) or C160 (RF).• For DTC C1233:

— connect a fused jumper wire between LF wheel speedsensor C150-1, circuit VCA03 (VT/WH), harness side andLF wheel speed sensor C150-1, circuit VCA03 (VT/WH),component side.

— connect the automotive meter between LF wheel speedsensor C150-2, circuit RCA17 (YE), harness side and LFwheel speed sensor C150-2, circuit RCA17 (YE),component side.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Test Step Result / Action to TakeD5 CHECK THE FRONT WHEEL SPEED SENSOR OUTPUT

(Continued)

• For DTC C1234:— connect the automotive meter between RF wheel speed

sensor C160-1, circuit VCA05 (GY/VT), harness side andRF wheel speed sensor C160-1, circuit VCA05 (GY/VT),component side.

— connect a fused jumper wire between RF wheel speedsensor C160-2, circuit RCA19 (VT), harness side and RFwheel speed sensor C160-2, circuit RCA19 (VT),component side.

YesINSPECT the wheel speed sensor tonering for damage and looseness. INSTALLnew components as necessary. If the tonering is OK, GO to D9.NoINSTALL a new affected wheel speed

• Ignition ON. sensor, REFER to Wheel Speed Sensor• Measure the current while slightly rotating the wheel using — Front, Rear Wheel Drive (RWD) or

incremental turns. Wheel Speed Sensor — Front, Four• Does the automotive meter switch between the low state Wheel Drive (4WD) in this section. CLEAR

(5-8 mA) and the high state (12-16 mA)? the DTCs. REPEAT the self-test.D6 CHECK THE REAR WHEEL SPEED SENSOR OUTPUT

• Ignition OFF.• Disconnect: Rear Wheel Speed Sensor C455.• Connect the automotive meter between rear wheel speed sensor

C455-1, circuit VCA07 (BU/OG), harness side and rear wheelspeed sensor C455-1, circuit VCA07 (BU/OG), component side.

• Connect a fused jumper wire between rear wheel speed sensorC455-2, circuit RCA21 (BN/GN), harness side and rear wheelspeed sensor C455-2, circuit RCA21 (BN/GN), component side.

YesINSPECT the wheel speed sensor tonering for damage and looseness. INSTALLnew components as necessary. If the tonering is OK, GO to D9.

• Ignition ON. No• Measure the current while slightly rotating the wheel using INSTALL a new rear wheel speed sensor,

incremental turns. REFER to Wheel Speed Sensor — Rear• Does the automotive meter switch between the low state in this section. CLEAR the DTCs.

(5-8 mA) and the high state (12-16 mA)? REPEAT the self-test.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Test Step Result / Action to TakeD7 CHECK FOR CORRECT ABS MODULE CONFIGURATION

NOTE: DTC C1222 indicates that there is a problem with the axle Yesconfiguration in the ABS module. GO to D9.• Carry out the ABS module configuration, refer to Section 418-01. No

Verify that the vehicle data matches the vehicle options. The system is operating correctly at this• Clear the DTC and carry out the self-test. time. CLEAR the DTC. REPEAT the• Is DTC C1222 still present? self-test.

D8 MONITOR THE WHEEL SPEED SENSOR PID• Enter the following diagnostic mode on the scan tool: Yes

DataLogger — ABS Module. GO to D9.• Drive the vehicle at various speeds above 10 km/h (6 mph) Nowhile monitoring the following PIDs: VERIFY that the air pressure in all 4 tires— Left Front Wheel Speed (LF WSPD) is at the specified level. ADJUST as— Right Front Wheel Speed (RF WSPD) necessary. VERIFY that all 4 wheels and— Rear Differential Wheel Speed (R DIF SPD) tires are the same size. INSTALL new as• Do all of the PIDs match? necessary. INSPECT all 4 tone rings for

damage and looseness. INSTALL new asnecessary. If the wheels, tires, tone ringsand tire pressure are OK, INSTALL a newwheel speed sensor. REFER to WheelSpeed Sensor — Front, Rear Wheel Drive(RWD), Wheel Speed Sensor — Front,Four Wheel Drive (4WD) or Wheel SpeedSensor — Rear in this section. CLEAR theDTCs. REPEAT the self-test.

D9 CHECK THE ABS MODULE CONNECTORS• Disconnect the ABS connector. Yes• Check for: INSTALL a new ABS module. REFER to

— corrosion. Anti-Lock Brake System (ABS) Module in— pushed-out pins. this section. CLEAR the DTC. REPEAT— spread terminals. the self-test.


Pinpoint Test E: DTC C1446 The brake fluid level switch is hardwired to theSmart Junction Box (SJB) and sends brake fluidRefer to Wiring Diagrams Cell 42, Vehiclelevel information directly to the SJB. The SJB thenDynamic Systems for schematic and connectorsends the brake fluid level information to theinformation.Instrument Cluster (IC) along the Medium Speed

Refer to Wiring Diagrams Cell 60, Instrument Controller Area Network (MS-CAN) bus. The ICCluster for schematic and connector information. sends the brake fluid level information out to otherRefer to Wiring Diagrams Cell 90, Turn modules (including the ABS module) along theSignal/Stop/Hazard Lamps for schematic and HS-CAN bus.connector information.

• DTC C1446 Brake Switch Circuit Failure — TheNormal Operation ABS module monitors the BPP message sent fromThe Brake Pedal Position (BPP) switch (also known the PCM and compares that message to the wheelas the stoplamp switch) is hardwired to the PCM. speed sensor inputs. If there are no wheel speedWhen the brake pedal is pressed, a voltage signal is sensor DTCs present and the BPP message doessent to the PCM. The PCM then sends a message not match wheel speed sensor input, the ABSto the ABS module over the High Speed Controller module will set DTC C1446. Also, if the brakeArea Network (HS-CAN) bus indicating that the fluid level message from the IC reports the fluidbrake pedal has been pressed. level as ‘‘low’’, ‘‘unknown’’ or ‘‘invalid’’ then

the ABS module will also set DTC C1446.


2008 F-250, 350, 450, 550 Super Duty, 7/2007



the following:

• Wiring, terminals or connectors

• Brake fluid level

• BPP switch

• ABS module

PINPOINT TEST E: DTC C1446

Test Step Result / Action to TakeE1 CHECK THE ABS MODULE BRAKE ON/OFF (BOO ABS) PID

• Connect the scan tool.• Ignition ON.• Enter the following diagnostic mode on the scan tool: YesDataLogger — ABS. GO to E3.• Monitor the BOO ABS PID while pressing and releasing the

brake pedal several times. No• Does the PID display match the pedal position every time? GO to E2.

E2 CHECK THE PCM BOO PID• Enter the following diagnostic mode on the scan tool: Yes

DataLogger — PCM. REFER to Section 418-00 to diagnose the• Monitor the BOO PID while pressing and releasing the brake HS-CAN bus.

pedal several times. No• Does the PID display match the pedal position every time? REFER to Section 417-01 to diagnose thestoplamp switch.

E3 CHECK THE BRAKE FLUID LEVEL• Verify that the brake fluid level in the master cylinder reservoir is Yes

at the correct level. GO to E4.• Is the brake fluid level OK? No

ADJUST the fluid as necessary. CLEARthe DTC. REPEAT the self-test.

E4 CHECK FOR BRAKE FLUID LEVEL DTCs IN THE SJB• Enter the following diagnostic mode on the scan tool: Self Test Yes

— SJB. REPAIR all SJB brake fluid level DTCs• Retrieve and record all SJB DTCs. before addressing C1446. REFER to the• Are any brake fluid level DTCs present in the SJB? Diagnostic Trouble Code (DTC) Chart in

Section 419-10.NoGO to E5.

E5 CHECK FOR IC COMMUNICATION (U-CODE) DTCs• Enter the following diagnostic mode on the scan tool: Self Test Yes

— IC. REPAIR all IC U-codes before addressing• Retrieve and record all IC DTCs. DTC C1446. REFER to Diagnosis and• Are any U-code DTCs present? Testing in Section 413-01.

CLEAR the DTC. REPEAT the self-test.NoGO to E6.

E6 CHECK THE RED BRAKE WARNING INDICATOR OPERATION• Monitor the red brake warning indicator in the IC.• Ignition OFF. Yes• Ignition ON. GO to E7.• Verify that the red brake warning indicator illuminates for 3

seconds and then extinguishes. No• Does the red brake warning indicator illuminate for 3 REFER to Section 413-01 to diagnose the

seconds and then extinguish? red brake warning indicator.E7 CHECK THE ABS MODULE CONNECTOR

• Ignition OFF.• Disconnect: ABS Module C135. Yes• Check the connector for: GO to E8.— corrosion.

— pushed-out pins. No— spread terminals. REPAIR the connector as necessary.

• Is the connector OK? CLEAR the DTC. REPEAT the self-test.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST E: DTC C1446 (Continued)

Test Step Result / Action to TakeE8 CHECK FOR CORRECT ABS MODULE OPERATION

• Connect: ABS Module C135. Yes• Make sure the connector is seated correctly, then clear the DTC INSTALL a new ABS module. REFER to

and repeat the ABS module self-test. Anti-Lock Brake System (ABS) Module in• Does the DTC return? this section. CLEAR the DTCs. REPEAT

the self-test.NoThe system is operating correctly at thistime. The concern may have been causedby a loose or corroded connector.

This pinpoint test is intended to diagnosePinpoint Test F: DTC B2900the following:

Normal Operation• Module configurationWhen the ignition is turned to the RUN position,• ABS modulethe ABS module and the PCM share Vehicle

Identification Number (VIN) information over theHigh Speed Controller Area Network (HS-CAN)bus.

• DTC B2900 VIN Mismatched — If the VINinformation stored in the ABS module does notmatch the information transmitted by the PCM,DTC B2900 will set.

PINPOINT TEST F: DTC B2900

Test Step Result / Action to TakeF1 VERIFY PCM VIN

• Connect the scan tool. Yes• Ignition ON. GO to F2.• Using the scan tool, carry out the Network Test. No• Enter the following diagnostic mode on the scan tool: Log RECONFIGURE the PCM. FOLLOW theViewer. instructions on the scan tool. CLEAR the• Compare the VIN in Log Viewer to the vehicle VIN plate. DTCs. CYCLE the ignition key. REPEAT• Does VIN in Log Viewer match the vehicle VIN plate? the self-test.

F2 VERIFY ABS MODULE PART NUMBER• Retrieve and record the ABS module part number from Log Yes

Viewer and verify that the vehicle has the correct ABS module CONFIGURE the ABS module. REFER toinstalled. Section 418-01, Programmable Module

• Is the correct ABS module installed in the vehicle? Installation (PMI) Using the IntegratedDiagnostic System (IDS) When theOriginal Module is NOT Available. CLEARthe DTC. CYCLE the ignition key.REPEAT the self-test.NoINSTALL a new ABS module. REFER toAnti-Lock Brake System (ABS) Module inthis section. CLEAR the DTC. CYCLE theignition key. REPEAT the self-test.

the following:Pinpoint Test G: Soft or Excessive PedalTravel • Leak in the hydraulic systemNormal Operation • Air in brake systemThe brake pedal should be firm at all times when

• Hydraulic Control Unit (HCU)applied.


2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST G: SOFT OR EXCESSIVE PEDAL TRAVEL

Test Step Result / Action to TakeG1 CHECK THE BASE BRAKE COMPONENTS

• Visually inspect the brake hoses and tubes from the master Yescylinder to the brake calipers. REPAIR or INSTALL new components as

• Visually inspect the calipers, master cylinder and HCU. necessary. TEST the system for normal• Are any of these components damaged? operation.

NoGO to G2.

G2 CHECK FOR A LEAKING DUMP VALVE• Ignition OFF.• Remove the rubber boots from the 2 HCU low pressure

accumulators.

• Insert a clean steel implement (paper clip or small screwdriver)into each low pressure accumulator.

• Ignition ON.• NOTE: A leaking dump valve is similar to the master cylinder

Yesbypass condition. It is important that the pedal be quickly andINSTALL a new HCU. REFER to Hydraulicforcefully applied to rule out master cylinder bypass as a cause.Control Unit (HCU) in this section.Typically, master cylinder bypass occurs only at low pedal

pressure rates. NoHave an assistant press hard on the brake pedal while REMOVE the steel implements. INSTALLobserving the steel implements. the rubber boots on each low pressure

• Do any of the implements move out 6.35 mm (0.25 in) or accumulator. REFER to Section 206-00 formore? diagnosis of the base brake system.

Pinpoint Test H: The Traction ControlSystem is Inoperative or the TractionControl System Cannot Be Disabled/Enabled

Refer to Wiring Diagrams Cell 42, VehicleDynamic Systems for schematic and connectorinformation.

2008 F-250, 350, 450, 550 Super Duty, 7/2007



Normal Operation Fused ignition voltage is sent to the traction controlThe ABS module sends vehicle speed information switch along circuit CBP35 (YE/GY) (for bothto the PCM along High Speed Controller Area traction control system activation and forNetwork (HS-CAN) bus. The PCM compares the illumination of the indicator in the switch). Whenfront wheel speed sensor information to the rear the traction control switch is pressed, this voltagewheel speed sensor information to determine if is sent to the PCM along circuit CCA15 (YE/GY).traction control is necessary. If traction control is If the traction control system is currently enablednecessary, the PCM limits engine torque, by when the PCM receives this voltage, it internallyregulating fuel and spark to the cylinders, to control grounds circuit CCA10 (WH/BN), this also groundsthe wheel slip. At the same time, the PCM circuit CBP35 (YE/GY) through the tractionilluminates the traction control indicator. The control switch and illuminates the yellow tractiontraction control indicator informs the driver that a control indicator in the switch. If the tractiontraction control event is taking place. control system is currently disabled when the PCM

receives this voltage, the PCM opens the internalThe traction control system can be disabled byground which extinguishes the yellow tractionpressing the traction control switch located on thecontrol indicator in the switch.instrument panel. When the system is disabled, the

yellow traction control system indicator light on the This pinpoint test is intended to diagnoseswitch will illuminate and the message center (if the following:equipped) will display TRACTION CONTROL • FuseOFF. Once disabled, the traction control can be

• Wiring, terminals or connectorsenabled by either pressing the traction controlswitch again or cycling the ignition key from OFF • Traction control switchto RUN. • Wheel speed sensor(s)

• PCM

• ABS module

PINPOINT TEST H: THE TRACTION CONTROL SYSTEM IS INOPERATIVE OR THE TRACTION CONTROLSYSTEM CANNOT BE DISABLED/ENABLED


Test Step Result / Action to TakeH1 CHECK THE PCM CONFIGURATION

• Connect the scan tool. Yes• Ignition ON. GO to H2.• Reconfigure the PCM. Refer to Programmable Module NoInstallation (PMI) in Section 418-01. The system is operating correctly at this• Test the system for normal operation. time. Concern caused by incorrect or• Is the symptom still present? incomplete configuration.

H2 CHECK FOR DTCs• Check for any ABS module, PCM or communication DTCs. Yes• Are any DTCs present? For ABS module DTCs, REFER to the

ABS Module DTC Chart.For PCM DTCs, REFER to the PowertrainControl/Emissions Diagnosis (PC/ED)manual.For any communication DTCs, REFER toSection 418-00.NoGO to H3.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST H: THE TRACTION CONTROL SYSTEM IS INOPERATIVE OR THE TRACTION CONTROL

SYSTEM CANNOT BE DISABLED/ENABLED (Continued)

Test Step Result / Action to TakeH3 CHECK THE TRACTION CONTROL SWITCH

• Measure the resistance between traction control switch C280 Yespin-1, component side, and pin-6, component side while GO to H4.pressing and releasing the switch. No• Is the resistance greater than 10,000 ohms with the switch INSTALL a new traction control switch.released and less than 5 ohms with the switch pressed? TEST the system for normal operation.

H4 CHECK CIRCUIT CBP35 (YE/GY) FOR AN OPEN• Ignition OFF.• Disconnect: Traction Control Switch C280.• Disconnect: Smart Junction Box (SJB) C2280b.• Measure the resistance between traction control switch C280-1,

circuit CBP35 (YE/GY), harness side and SJB C2280b-9, circuitCBP35 (YE/GY), harness side.

YesGO to H5.NoVERIFY SJB fuse 35 (10A) is OK. If OK,REPAIR circuit CBP35 (YE/GY). If not OK,REFER to Wiring Diagrams Manual toidentify the possible causes of the circuitshort. TEST the system for normal

• Is the resistance less than 5 ohms? operation.H5 CHECK CIRCUIT CBP35 (YE/GY) FOR A SHORT TO GROUND

• Measure the resistance between traction control switch C280-1,circuit CBP35 (YE/GY), harness side and ground.

YesGO to H6.NoREPAIR circuit CBP35 (YE/GY). TEST the

• Is the resistance greater than 10,000 ohms? system for normal operation.H6 CHECK CIRCUIT CCA15 (YE/GY) FOR AN OPEN

• Disconnect: PCM C175t (Gasoline).• Disconnect: PCM C1232b (Diesel).

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007




Test Step Result / Action to TakeH6 CHECK CIRCUIT CCA15 (YE/GY) FOR AN OPEN (Continued)

• For gasoline engines, measure the resistance between tractioncontrol switch C280-6, circuit CCA15 (YE/GY), harness side andPCM C175t-33, circuit CCA15 (YE/GY), harness side.

• For diesel engines, measure the resistance between tractioncontrol switch C280-6, circuit CCA15 (YE/GY), harness side andPCM C1232b-13, circuit CCA15 (YE/GY), harness side.

YesGO to H7.NoREPAIR circuit CCA15 (YE/GY). TEST the

• Is the resistance less than 5 ohms? system for normal operation.H7 CHECK CIRCUIT CCA15 (YE/GY) FOR A SHORT TO GROUND

• Measure the resistance between traction control switch C280-6,circuit CCA15 (YE/GY), harness side and ground.

YesGO to H8.NoREPAIR circuit CCA15 (YE/GY). TEST the

• Is the resistance greater than 10,000 ohms? system for normal operation.H8 CHECK THE PCM CONNECTORS

• Ignition OFF.

(Continued)

2008 F-250, 350, 450, 550 Super Duty, 7/2007




Test Step Result / Action to TakeH8 CHECK THE PCM CONNECTORS (Continued)

• Check PCM connector for: YesINSTALL a new PCM. Refer to the— corrosion. appropriate section in Group 303 for the— pushed-out pins. procedure. TEST the system for normal— spread terminal. operation.• Connect the PCM connector and make sure that it is seated

correctly. No• Make sure the connector is seated correctly then operate the The system is operating correctly at this

system and verify the concern is still present. time. Concern may have been caused by• Is the concern still present? a loose or corroded connector.

Pinpoint Test I: The Traction Control Fused ignition voltage is sent to the traction controlIndicator is Always On switch along circuit CBP35 (YE/GY) (for both

traction control system activation and forRefer to Wiring Diagrams Cell 42, Vehicleillumination of the indicator in the switch). WhenDynamic Systems for schematic and connectorthe traction control switch is pressed, this voltageinformation.is sent to the PCM along circuit CCA15 (YE/GY).

Normal Operation If the traction control system is currently enabledThe ABS module sends vehicle speed information when the PCM receives this voltage, it internallyto the PCM along High Speed Controller Area grounds circuit CCA10 (WH/BN), this also groundsNetwork (HS-CAN) bus. The PCM compares the circuit CBP35 (YE/GY) through the tractionfront wheel speed sensor information to the rear control switch and illuminates the yellow tractionwheel speed sensor information to determine if control indicator in the switch. If the tractiontraction control is necessary. If traction control is control system is currently disabled when the PCMnecessary, the PCM limits engine torque, by receives this voltage, the PCM opens the internalregulating fuel and spark to the cylinders, to control ground which extinguishes the yellow tractionthe wheel slip. At the same time, the PCM control indicator in the switch.illuminates the traction control indicator. The

This pinpoint test is intended to diagnosetraction control indicator informs the driver that athe following:traction control event is taking place.• Wiring, terminals or connectorsThe traction control system can be disabled by• PCMpressing the traction control switch located on the

instrument panel. When the system is disabled, theyellow traction control system indicator light on theswitch will illuminate and the message center (ifequipped) will display TRACTION CONTROLOFF. Once disabled, the traction control can beenabled by either pressing the traction controlswitch again or cycling the ignition key from OFFto RUN.

2008 F-250, 350, 450, 550 Super Duty, 7/2007


DIAGNOSIS AND TESTING (Continued)PINPOINT TEST I: THE TRACTION CONTROL INDICATOR IS ALWAYS ON


Test Step Result / Action to TakeI1 CHECK THE TRACTION CONTROL SYSTEM OPERATION

• Test drive the vehicle and verify the traction control system Yesoperation. The system is operating correctly. The

• Does the traction control system operate normally with the concern may have been caused by ayellow traction control indicator illuminated when the loose or corroded connector. INSPECT thesystem is disabled and extinguished when the system is traction control switch and PCM electricalenabled? connectors and REPAIR as necessary.

TEST the system for normal operation.NoIf the system does not operate normally,GO to Pinpoint Test H.If the system operates normally but theyellow traction control indicator in theswitch does not operate normally, GO toI2.

I2 ISOLATE THE PCM• Ignition OFF. Yes• Disconnect: PCM C1232b (Diesel). GO to I3.• Disconnect: PCM C175t (Gasoline).• Ignition ON. No• Is the traction control indicator illuminated? GO to I4.

I3 CHECK CIRCUIT CCA10 (WH/BN) FOR A SHORT TO GROUND• Ignition OFF.• Disconnect: Traction Control Switch C280.• Measure the resistance between traction control switch C280-4,

circuit CCA10 (WH/BN), harness side and ground.

YesGO to I4.NoREPAIR circuit CCA10 (WH/BN). TEST

• Is the resistance greater than 10,000 ohms? the system for normal operation.I4 CHECK THE PCM CONNECTORS

• Ignition OFF.• Check the PCM connector for: Yes

INSTALL a new PCM. Refer to the— corrosion. appropriate section in Group 303 for the— pushed-out pins. procedure. TEST the system for normal— spread terminal. operation.• Connect the PCM connector and make sure that it is seatedcorrectly. No

• Make sure the connector is seated correctly then operate the The system is operating correctly at thissystem and verify the concern is still present. time. Concern may have been caused by

• Is the concern still present? a loose or corroded connector.

2008 F-250, 350, 450, 550 Super Duty, 7/2007

Documents

DIAGNOSIS AND TESTING - JustAnswer - About Us ...ww2.justanswer.com/uploads/sdcrowder/2010-09-08_235032...2010/09/08 · present, INSTALL a new ABS module. REFER to Anti-Lock Brake