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Pinpoint Test Be: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U3000:4B Control Module: Over Temperature

  1. 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 Diagnostic Trouble Codes (DTCs) 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 PSCMDTC U3000:4B Control Module: Over Temperature 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 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 PSCMDTC U3000:xx is present and provide diagnostics if DTC U3000:xx is currently active in the PSCM.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PSCM U3000:4B Control Module: Over Temperature Sets when the internal temperature of the steering gear exceeds a temperature threshold. This is most likely due to high ambient temperature conditions, heavy loads on the steering system, or a damaged PSCM housing allowing heat into the steering column. Consult the DTC Index for additional information if needed.

    Possible Sources 

    • EPAS column assembly internal failure
    • Heavy loads on the EPAS system
    • Excessive ambient temperatures

  2. BE1 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  BE2
    No  GO to the PSCM DTC U3000 Control Module - Electronic Steering Actuator pinpoint test.

  3. BE2 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  BE3
    No  If DTC U3000:4B is not present and active in the PSCM : DISCONTINUE this pinpoint test.

  4. BE3 VERIFY THE CONDITION OF THE PSCM (POWER STEERING CONTROL MODULE) HOUSING

    • NOTE: If equipped, the knee air bag module must be removed to gain access to the EPAS electrical connectors. REFER to the appropriate service information for additional information.
      NOTE: Inspect the steering column housing for damage and cracks large enough to allow access inside the steering column housing.

      Ignition OFF.

    Is the steering column housing free from damage or cracks? 

    Yes  GO to  BE4
    No  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 

  5. BE4 VERIFY DRIVING CONDITIONS

    • Verify if the customer was towing for long distances, towing in hot weather, performing a high number of parking lot maneuvers or any other maneuvers leading to higher steering system temperatures (sand, deep soil, etc.).

    Was the customer performing any high temperature driving maneuvers similar to those mentioned above? 

    Yes  PSCMDTC U3000:4B may have been set due to these driving conditions.ADVISE the customer high ambient temperatures or heavy loads on the EPAS system cause this DTC to set, resulting in higher than usual steering effortAn example of a heavy load would be multiple parking lot maneuvers over a short duration of time with low tire pressure or towing for long distances followed by multiple parking maneuvers.
    No  The condition causing the DTC to set is not present at this time and may have set due to driving or environmental conditions.The repair is complete. Overheat Diagnostic Trouble Codes (DTCs) do not require a steering gear replacement.Pinpoint Tests BD: PSCM DTC U3001 Control Module Improper Shutdown Performance
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