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Pinpoint Test Y: Abs Module Internal Fault Concern

  1. Normal Operation and Fault Conditions 

    The ABS module carries out self tests during operation, The module also monitors various inputs and compares the values to what is expected. If the values received are out of range, are not what is expected, or if any of the self tests fail, the ABS module sets a DTC.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS C1B11:71 Pressure Control Valve: Actuator Stuck Sets when the pressure control valve inside the EBB unit does not actuate when commanded.
    ABS P062F:42 Internal Control Module EEPROM Error: General Memory Failure The ABS module calculates and stores a checksum value relating to the RSC feature. When the ignition is set to ON, the ABS module calculates a checksum and compares it against the stored checksum. If the two values do not match, this DTC is set.
    ABS U3000:00 Control Module: No Sub Type Information Sets when the ABS module detects an internal hardware fault.
    ABS U3000:49 Control Module: Internal Electronic Failure Sets when the ABS module detects an internal hardware fault.
    ABS U3000:4B Control Module: Over Temperature Sets when the ABS module detects excessive temperature within the ABS module.
    ABS U3000:96 Control Module: Component Internal Failure Sets when the ABS module detects an internal hardware fault.

    Possible Causes 

    • Incorrect sensor input
    • Stuck valve
    • EBB unit

  2. Y1 GUIDED DIAGNOSTIC QUESTION

    • This step is for vehicles equipped with an EPB system or an EBB unit.

    Were you sent here from diagnostics in Parking Brake and Actuation or Power Brake Actuation? 

    Yes  GO to  Y5
    No  GO to  Y2

  3. Y2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR DTCS

    • Ignition ON.

    • Using a diagnostic scan tool, Clear the ABS module DTCs.

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Ignition ON.

    • NOTE: If DTC U3000:4B is present, allow the vehicle to cool for a minimum of 30 minutes.

      Using a diagnostic scan tool, carry out the ABS module self-test.

    • Record the ABS module DTCs.

    Are any of the DTCs from the Fault Trigger Conditions table present and active in the ABS module? 

    Yes  GO to  Y5
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  4. Y3 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR DTCS

    • Ignition ON.

    • Clear the ABSDTCs.

    • Ignition ON.

    • Carry out the ABS self-test.

    • Record the ABS module DTCs.

    Are any of the DTCs from the Fault Trigger Conditions table present and active in the ABS module? 

    Yes  GO to  Y4
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  5. Y4 CHECK THE BRAKE SYSTEM FOR LEAKS

    • Inspect the all hydraulic connections and the following items for damage or leaks:

      • Master cylinder
      • Brake fluid reservoir
      • HCU (if equipped)
      • EBB unit (if equipped)
      • Brake calipers

    Are any leaks found or are any items damaged? 

    Yes  REPAIR all leaks found and INSTALL new items for any damaged items found. GO to  Y5
    No  GO to  Y5

  6. Y5 CHECK FOR CORRECT EBB UNIT OPERATION

    NOTE: The battery must be removed to access the ABS module electrical connector.

    • Ignition OFF.

    • Remove the battery. REFER to: BATTERY .

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode

    • Disconnect ABS module connector C135.

    • Using a good light source, inspect the electrical connector 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

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

    • Install the battery. REFER to: BATTERY .

    • 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 a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new EBB unit. REFER to: ELECTRIC BRAKE BOOSTER (EBB) . REFER to: Electric Brake Booster (EBB) - E85 Full Hybrid Electric Vehicle (FHEV)/Full Hybrid Electric Vehicle (FHEV)/Plug-In Hybrid Electric Vehicle (PHEV), LHD 4WD/LHD FWD (206-09 Anti-Lock Brake System (ABS) and Stability Control).
    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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