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Pinpoint Test G: Reduced System Function

  1. Normal Operation and Fault Conditions 

    The ABS module incorporates a function for testing the vehicle on a dynamometer to prevent wheel speed sensor DTC's from setting during testing. The PCM sends a message to the ABS module when the vehicle is setup for testing. When the ABS module receives this message it knows to ignore discrepancies between the front and rear wheel speed sensors.

    The ABS module exits the test mode automatically when the PCM sends the exit message, the ignition is set to OFF, either of the non-driven wheels exceeds 20 km/h (12 mph) or a wheel speed sensor DTC is detected on any wheel speed sensor.

    REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U2001:00 Reduced System Function: No Sub Type Information Sets when the ABS module has been set to dynamometer test mode.

    Possible Causes 

    • ABS module in test mode

    Visual Inspection and Pre-checks 

    • Drive the vehicle above 20 km/h (12 mph). Stop and cycle the ignition from ON to OFF and back to ON. Carry out the ABS module self-test. If the DTC returns, retrieve and diagnose all PCM Diagnostic Trouble Codes (DTCs).

  2. G1 CHECK THE WHEELS AND TIRES

    • Inspect the wheels and tires for any damage or excessive wear.

    • Verify all wheels and tires are the same size and match the size indicated on the VC label.

    • Verify the inflation pressure of all 4 tires is correct as indicated on the VC label.

    Are the wheels and tires OK? 

    Yes  GO to  G2
    No  INSTALL the correct size wheel or tire or ADJUST tire pressure as necessary.

  3. G2 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.

    • Press Read Vehicle Information button to retrieve DTC's from the vehicle.
      NOTE: DTC's may be displayed from previous diagnostic actions.

    • Read vehicle information.

    Does the RCM pass the Network Test? 

    Yes  GO to  G3
    No  REFER to: Communications Network in the appropriate Module Communications Network article. to diagnose the RCM does not communicate with the scan tool.

  4. G3 RETRIEVE ALL DTCS FROM THE RCM (RESTRAINTS CONTROL MODULE)

    • Carry out the RCM self-test.

    Are any DTC's present? 

    Yes  DIAGNOSE the RCM DTC's first. REFER to: Airbag Supplemental Restraint System (SRS) .
    No  GO to  G4

  5. G4 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTCS

    • Ignition ON.

    • Carry out the ABS module self-test.

    Is DTC U0151:xx or U0452:xx present and active in the ABS module? 

    Yes  GO to Pinpoint Test CE 
    No  GO to  G5

  6. G5 CHECK THE RCM (RESTRAINTS CONTROL MODULE) (RESTRAINTS CONTROL MODULE) INSTALLATION AND MOUNTING SURFACE

    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

    • Ignition OFF.

    • Wait one minute.

    • Disconnect RCM module connector C310A.

    • Disconnect RCM module connector C310B.

    • Inspect the RCM mounting surface for damage, corrosion or dirt.

    Is the RCM installed correctly and is the mounting surface clean and free from damage? 

    Yes  GO to  G6
    No  CLEAN or REPAIR the mounting surface or INSTALL a new RCM as necessary. REFER to: RESTRAINTS CONTROL MODULE (RCM) .

  7. G6 VERIFY STABILITY CONTROL SENSOR CALIBRATION

    NOTE: The vehicle must be on level ground and at a complete standstill during sensor calibration. Any vehicle movement results in a failed calibration.

    • Ignition ON.

    Does the scan tool routine pass? 

    Yes  GO to  G7
    No  GO to  G8

  8. G7 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTCS

    • Clear the ABS module DTC's.

    • Ignition OFF.

    • Ignition ON.

    • Test drive the vehicle above 20 km/h (12 mph) and make at lest 1 left turn and 1 right turn.

    • Carry out the ABS module self-test.

    Are any of the DTC's listed in the DTC Fault Trigger Conditions table present in the ABS module? 

    Yes  GO to  G8
    No  The condition causing the concern is no longer present. The concern was most likely caused by an incomplete calibration or a previously failed calibration of the stability control sensors.

  9. G8 CHECK THE FD1-CAN CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect ABS module connector C135.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C135 Pin 33
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground
      C135 Pin 32
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  G9

  10. G9 CHECK THE FD1-CAN CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      C135 Pin 32
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground
      C135 Pin 33
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistance greater than 10, 000 ohms? 

    Yes  GO to  G10
    No  REPAIR the circuit in question.

  11. G10 CHECK THE FD1-CAN CIRCUITS FOR A SHORT TOGETHER

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      C135 Pin 33
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C135 Pin 32

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  G12
    No  REPAIR the circuits.

  12. G11 CHECK THE FD1-CAN CIRCUITS FOR AN OPEN

    Are the resistance less than 3 ohms? 

    Yes  GO to  G12
    No  REPAIR the circuit in question.

  13. G12 VERIFY ALL WIRING CONNECTIONS

    • Using a good light source, inspect all disconnected electrical connectors for the following:

      • Corrosion - install new connector or terminal and clean the module pins
      • Damaged or bent pins - install new terminals or pins
      • Pushed-out pins - install new pins as necessary
      • Spread terminals - install new terminals as necessary

    Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals? 

    Yes  GO to  G13
    No  Refer to Connector Repair Procedures for schematic and connector information.

  14. G13 CHECK THE RCM (RESTRAINTS CONTROL MODULE) (RESTRAINTS CONTROL MODULE) FOR CORRECT OPERATION

    • Connect ABS module connector C135. Make sure the connector seats and latches correctly.

    • Connect RCM module connector C310A. Make sure the connector seats and latches correctly.

    • Connect RCM module connector C310B. Make sure the connector seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If no service articles address this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, DIAGNOSE the RCM concern. REFER to: Airbag Supplemental Restraint System (SRS) .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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