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Pinpoint Test B: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U3000 Control Module

  1. 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 
    • The PSCM is self monitoring and performs self tests at specific intervals (initial power up, power down, during normal operation, ect.) Each self test requires the voltage supply to the PSCM to be at or above a specific level (above 6 volts, above 9 volts, between 10 and 17 volts, ect.) for the test to take place. If one or more of the self tests should fail, the module sets one or more Diagnostic Trouble Codes (DTCs).

    Pinpoint Test Applicability 

    • Pinpoint Test Applicability 
    • This test applies to PSCMDTC U3000:xx Diagnostic Trouble Codes (DTCs) except  for U3000:4B. This test does not apply to any other module except the PSCM.

    DTC Diagnostic Strategy 

    • DTC Diagnostic Strategy 
    • If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), 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 Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

    Pinpoint Test Purpose 

    • Pinpoint Test Purpose 
    • To verify PSCM U3000:XX is present and provide diagnostics if DTC U3000:XX is currently present and active in the PSCM.

    Diagnostic Aids 

    • Diagnostic Aids 
    • For DTC U3000:42, steering assist is not affected and there is no warning in the message center. The PSCM may transmit an invalid steering angle message over the HS-CAN.
    • For DTC U3000:49, during the ignition cycle the DTC initially sets, the PSCM enters limp home mode and steering assist is gradually reduced until the PSCM enters manual mode. The PSCM sends a message to the IPC to display the

      STEERING ASSIST FAULT SERVICE REQUIRED  in the message center.

    • During the next ignition cycle after the DTC sets, If the PSCM is not already in manual mode the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the

      STEERING ASSIST FAULT SERVICE REQUIRED  in the message center.

    • The presence of DTC U3000:49 prevents the optional steering features; active park assist, Lane Keeping Assist (LKA) and Lane Centering Assist (LCA) from activating. If the DTC sets during an assist event, the event is terminated and the assist system is deactivated.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PSCM U3000:05 Control Module: System Programming Failures If an internal error is detected in the PSCM hardware, DTC U3000:05 is set.
    PSCM U3000:4B Control Module: Over Temperature This DTC sets if the PSCM detects excessive temperature within the PSCM.
    PSCM U3000:42 Control Module: General Memory Failure This DTC sets if the PSCM detects an internal memory data error during the data plausibility check.
    PSCM U3000:49 Control Module: Internal Electronic Failure If any time during normal operation with more than 10 volts supplied to the PSCM, the module detects a software or internal hardware error, DTC U3000:49 is set.
    PSCM U3000:61 Control Module: Signal Calculation Failure This DTC sets if the PSCM detects a steering sensor error during the data plausibility check.
    PSCM U3000:66 Control Module: Signal Has Too Many Transitions/Events If the PSCM detects the fault mitigation counter has exceeded a pre-set limit, DTC U3000:66 is set.

    Possible Sources 

    • Heat shield missing
    • Steering column internal failure
    • Incorrect EPAS column installed
    • Heavy loads on the EPAS column
    • Excessive ambient temperatures

    Visual Inspection and Pre-checks 

    • This DTC sets when the PSCM internal self tests detect a software or hardware internal error. This can be to internal faults in the PSCM or from water getting inside the PSCM. For additional fault setting information, refer to the PSCMDTC Chart.

  2. B1 VERIFY STEERING TYPE

    NOTE: This pinpoint test is applicable to EPAS vehicles only. It DOES NOT apply to HPAS vehicles equipped with an electric steering actuator.

    NOTE: The presence of a power steering pump, hydraulic hoses or tubes indicates a HPAS system.

    • Inspect the vehicle and determine if the steering system is EPAS or HPAS with an electric steering actuator.

    Is this vehicle equipped with EPAS ' 

    Yes  GO to  B2
    No  Refer to: Pinpoint Tests B: PSCM DTC U3000 Control Module - EPAS .

  3. B2 RETRIEVE THE PSCM (POWER STEERING CONTROL MODULE) DTCS

    • Start the vehicle.

    • Using a diagnostic scan tool, carry out a self-test of the PSCM.

    Is DTC U3000:4B currently present and active in the PSCM ' 

    Yes  GO to Pinpoint Test BE 
    No  If DTC U3000:05 or U3000:42 are present: GO to  B3For all otherPSCM U3000:xx Diagnostic Trouble Codes (DTCs): GO to  B4
    If DTC U3000:xx is not currently present and active in the PSCM : DISCONTINUE this pinpoint test and REFER to Pinpoint Tests B: PSCM DTC U3000 Control Module - EPAS

  4. B3 PROGRAM THE PSCM (POWER STEERING CONTROL MODULE) AND CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a diagnostic scan tool, program the PSCM with the latest level software. REFER to Module Programming for additional information.

    • Ignition OFF.

    • Ignition ON.

    • Using a scan tool, clear the PSCM Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Start the vehicle.

    • Using a diagnostic scan tool, carry out a self-test of the PSCM.

    Is DTC U3000:05 or U3000:42 present and active in the PSCM ' 

    Yes  GO to  B4
    No  The condition causing the DTC was most likely due to improper or incomplete PSCM programming. The repair is complete.

  5. B4 CHECK THE PSCM (POWER STEERING CONTROL MODULE) FOR RETURNING DTCS

    • Ignition ON.

    • Using a scan tool, clear the PSCM Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Wait at least one minute.

    • Start the vehicle.

    • Using a diagnostic scan tool, carry out a self-test of the PSCM.

    Is DTC U3000:xx present in the PSCM ' 

    Yes  CHECK OASIS for any applicable 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 exist for this concern,
    INSTALL a new EPAS steering column.
    RVC: 
    Generate RVC only works in single-step view Generate RVC requires VIN entry 
    No  If the PSCM does not list DTC U3000, DISCONTINUE this test and REFER to Diagnostic Trouble Code (DTC) Chart .If other modules are reporting DTC U3000. Pinpoint Tests B: PSCM DTC U3000 Control Module - EPAS
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