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Pinpoint Test An: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U2016 Control Module Main Software

  1. NOTE: When DTC U2016:48 is set, the PSCM remains in normal operation mode, but features such as Active Nibble Control, Pull-Drift Compensation, Lane Departure Warning, Lane Keep Assist, ect. are disabled.

    Normal Operation and Fault Conditions 

    Description 

    • Description 
    • When the battery voltage to the PSCM is greater than 10 volts with the ignition ON and there are no DTC present, the PSCM runs a self test of the system software. If an error is detected, a DTC is set and the EPAS enters into a limited operation mode.

    Pinpoint Test Applicability 

    • Pinpoint Test Applicability 
    • This test applies to PSCM DTC U2016 Control Module Main Software only. It 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 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 
    • To verifyPSCM DTC U2016 is present and provide diagnostics if DTC U2016 is currently active in the PSCM.

    Diagnostic Aids 

    • Diagnostic Aids 
    • During the ignition cycle the DTC U2016:47 initially sets, the PSCM either 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

      STEERING ASSIST FAULT SERVICE REQUIRED  in the message center.

    • During the next ignition cycle after DTC U2016:47 sets, if the concern is still present, 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.

    • When DTC U2016:48 is set, the PSCM remains in normal operation mode, but all steering features; Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PSCM U2016:47 Control Module Main Software: Watchdog/Safety μC Failure Sets due to an internal failure in the PSCM software.
    PSCM U2016:48 Control Module Main Software: Supervision Software Failure Sets due to an internal failure in the PSCM software.

    Possible Sources 

    • PSCM internal failure

    Visual Inspection and Pre-checks 

    • This DTC sets when the PSCM internal self tests detect a software internal error. Consult the DTC Index for additional information if needed.

  2. COMPLETE THE FDRS GUIDED ROUTINE

    1. This procedure must be completed using FDRS. Do not clear DTCs until the FDRS procedure has completed. To complete the diagnosis, navigate to the FDRS Guided Routine tab and carry out the procedure 

      Electronic Power Assist Steering (EPAS) Internal Failure

    .
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