Pinpoint Test Z: Abs (Anti-Lock Brake System) Module DTC (Diagnostic Trouble Code) C0051 Steering Angle Concerns With The PSCM (Power Steering Control Module) - Electrical

Refer to POWER STEERING CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions 

REFER to: Power Steering - System Operation and Component Description .

Description 

• Description 
• ABS module DTC C006B:xx and C0051:xx set when the comparison between the ABS module steering angle information and the PSCM steering angle information is outside of the expected range. Both mechanical and electrical components may cause this concern.

Pinpoint Test Applicability 

• Pinpoint Test Applicability 
• This test applies to electrical concerns with the PSCM resulting in ABS module DTC C006B:xx, ABS module DTC C0051:xx or ABS false activation only.

DTC Diagnostic Strategy 

• DTC Diagnostic Strategy 
• If the module DTC list results in a large number of DTC, diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern DTC are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active DTC before diagnosing any historic DTC.

Pinpoint Test Purpose 

• Pinpoint Test Purpose 
• This pinpoint test checks both the PSCM and the associated electrical wiring which can affect the steering wheel angle comparison between the ABS module and the PSCM.

Possible Sources 

• PSCM Internal Failure DTC
• PSCM Network Lost Communication DTC
• PSCM Network Invalid Data DTC
• Starter, alternator, charging system voltage levels low
• Steering wiring harness, grounds or connectors
• Non-steering wiring harness, grounds or connectors

• Verifying the pinpoint test

Has pinpoint test Y been carried out? 

• Inspect the battery connections and battery wiring. REFER to: Battery Disconnect and Connect - Vehicles With: Single Battery .
  • Verify the connections are clean and tight.
  • Verify the connections and cables are free from corrosion, cuts, and other damage.

• Inspect the generator connections and generator wiring. REFER to: Steering Gear .
  • Verify the connections are clean and tight.
  • Verify the connections and cables are free from corrosion, cuts, and other damage.

• Verify the battery and charging system are providing the correct voltage to the vehicle.

Are the battery, generator and wiring in good condition, and is the system providing the correct voltage? 

• Ignition ON.

• Clear the PSCM DTC s.

• Ignition OFF.

• Wait at least 90 seconds for all modules to shut down.

• Ignition ON.

• Drive the vehicle, attempt to replicate the customer's driving conditions.

• Carry out the PSCM self-test.

Does the PSCM respond to the diagnostic scan tool? 

• Ignition ON.

• Carry out the PSCM self-test.

• This question does not apply to DTC s in history.

Are any of the following DTC s currently present and active in the PSCM ; C102D, C1B00, C200B, C200C, C200D, P07AE, U2100, U2011, or U3000? 

• Using the results from the previous step, determine if any lost communication, invalid data, or voltage DTC s are present in the PSCM.
  • Lost communication DTC s indicate the PSCM is missing messages from another module within a certain expected time frame.
  • Invalid data DTC s indicate the PSCM received messages from another module but the data in the message is outside the expected content.
  • Voltage DTC s indicate the PSCM received voltages outside the expected range.

• PSCM COMMUNICATION AND INVALID DATA DTCS

  Lost Communication DTC s	Invalid Data DTC s	Voltage DTC s	Control Module DTC s
  U0100	U0401	B1304	U3001
  U0102	U0403	U3003
  U0121	U0415
  U0122	U0422
  U0126	U0423
  U0137	U0428
  U0140	U0447
  U0146	U0452
  U0151	U045A
  U0155	U053B
  U0159	U053C
  U019B	U0553
  U0212	U0554
  U023A
  U023B
  U0252
  U0253

Are any of the DTC s from the above table either currently or previously present in the PSCM ' 

• Using the results from the previous step, determine if any voltage DTC s are present in the PSCM.

Is DTC U3001 or U3003 either currently or previously present in the PSCM ' 

• Inspect high-current BJB fuse 2 (80A) and auxiliary junction box fuse 67 (5A).
  • Make sure both fuses are fully seated.
  • Make sure both fuses are not open.
  • Make sure both fuses are undamaged.

Are both fuses fully seated, undamaged and not open? 

• Visually check both power wiring and ground wiring for chaffing or pinching on other components.

• Verify the power and ground connections are clean, fully seated or tightened, and free of corrosion.

Are the power and ground wiring and connections free from damage and correctly seated and tightened? 

• Make sure the front wheels are on the ground and the vehicle is not being supported by other means.
  • Make sure the front tires are clean and dry.
  • Make sure the ground under the front tires is clean and dry.

• Ignition ON, engine running.

• Take the following measurement while turning the steering wheel back and forth, lock to lock, continuously at 1 revolution per second.

• Measure the voltage between:

  Positive Lead	Measurement / Action	Negative Lead
  CPOSITIVE TERMINAL	Courtesy of FORD MOTOR COMPANY	CNEGATIVE TERMINAL

• Using a diagnostic scan tool,

  Access the PSCM and monitor the VPWR (V) PID

• Compare the measured battery voltage with the PID display.

Do the measured battery voltage and the PID display voltage differ by more than 1.5 volts? 

• PSCM connector C1436B at the steering column carries messages to and from the PSCM.

• In-line connectors C211 (if equipped with trailer brake module), C210, C263 (if equipped with split view camera), C264 (if equipped with split view camera), C311 (if equipped with blind spot detection) and C1046 carry messages to and from the vehicle network.

• Ignition OFF.

• Disconnect PSCM _A connector, C1463A.

• Disconnect PSCM _B connector, C1463B.

• Disconnect all applicable in-line electrical connectors as indicated above.

• Inspect all disconnected electrical connectors for the following:
  • Pushed-out pins, loose pins, spread terminals, water ingress or corrosion.
  • Missing or loose latches, broken or cracked connector housings.

• Inspect the HS-CAN wiring for:
  • Pinched or cut wiring under brackets, air cleaner boxes, battery trays, engine pulleys, etc.
  • Loose wiring harness anchoring locations in the engine compartment.

• Repair connectors or wiring as required.

• Connect PSCM _A connector, C1463A. Make sure the connector seats and latches correctly..

• Connect PSCM _B connector, C1463B. Make sure the connector seats and latches correctly..

• Connect all disconnected, in-line electrical connectors. Make sure the connectors seat and latch correctly.

• Ignition ON, engine OFF.

• Clear the PSCM DTC s.

• Ignition OFF.

• Wait at least 90 seconds for all modules to shut down.

• Ignition ON, engine running.

• Drive the vehicle, attempt to replicate the customer's driving conditions.

• Carry out the PSCM self-test.

• This question does not apply to DTC s in history.

Are there any lost communication or invalid data DTC s currently present and active in the PSCM ' 

• Ignition OFF.

• Visually Inspect the HS-CAN wiring is not pinched, chaffed, chewed by animals, damaged near or under the battery tray or other nearby components.

• Disconnect the battery negative cable. REFER to: Battery Disconnect and Connect - Vehicles With: Single Battery . REFER to: Battery Disconnect and Connect - Vehicles With: Dual Batteries .

• Disconnect GWM connector, C2431A.

• Disconnect PSCM _B connector, C1463B.

• Measure the resistance between:

  Positive Lead	Measurement / Action	Negative Lead
  C1463B Pin 3	Courtesy of FORD MOTOR COMPANY	C2431A Pin 8
  C1463B Pin 2	Courtesy of FORD MOTOR COMPANY	C2431A Pin 21

Is the resistance less than 3 ohms? 

• Connect GWM connector, C2431. Make sure the connector seats and latches correctly..

• Connect PSCM _B connector, C1463B. Make sure the connector seats and latches correctly..

• Connect the battery negative cable. Refer to the General Procedure, REFER to: Battery Disconnect and Connect - Vehicles With: Single Battery . REFER to: Battery Disconnect and Connect - Vehicles With: Dual Batteries .

• Ignition ON, engine OFF.

• Clear the PSCM DTC s.

• Ignition OFF.

• Wait at least 90 seconds for all modules to shut down.

• Ignition ON, engine running.

• Carry out the ABS self-test.

• Carry out the PSCM self-test.

• This question does not apply to DTC s in history.

Are any lost communication or invalid data DTC s currently present and active in the PSCM or are any C006B:xx or C0051:xx DTC s currently present and active in the ABS module?