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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.

    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 C1B11:71 Pressure Control Valve: Actuator Stuck Sets when the ABS module detects an unwanted opening or closing of the pressure control valve. This is most likely due to an internal failure of the EBB.
    ABS P0604:49 Internal Control Module Random Access Memory (RAM) Error: Internal Electronic Failure Sets when the ABS module detects an internal hardware fault.
    ABS P062F:46 Internal Control Module EEPROM Error: Calibration/Parameter Memory Failure This DTC sets when a value is written by the ABS module is written to EEPROM but the value read back is not correct.
    ABS U3000:00 Control Module: No Sub Type Information Sets when the ABS module detects an internal hardware fault.
    ABS U3000:04 Control Module: System Internal Failure Sets when the ABS module detects an internal hardware fault.
    ABS U3000:45 Control Module: Program Memory Failure Sets when the ABS module detects an internal hardware fault.
    ABS U3000:47 Control Module: Watchdog/Safety μC Failure 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 an internal hardware fault.
    ABS U3000:96 Control Module: Component Internal Failure Sets when the ABS module detects an internal hardware fault.

    Possible Causes 

    • HS-CAN concern
    • 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 service information 206-05 or 206-07? 

    Yes  GO to  Y3
    No  GO to  Y2

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

    • 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, clear the ABSDTC s. Only available in the on-line OEM service information.

    • 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.

    • Using a diagnostic scan tool, carry out the ABS self-test. Only available in the on-line OEM service information.

    • Record the ABS module DTC s.

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

    Yes  GO to  Y3
    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 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect ABS module 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 C135. 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 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) .
    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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