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Pinpoint Test BD: U351B

  1. NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.

    Normal Operation and Fault Conditions 

    REFER to: Electric Powertrain Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SOBDMC U351B:00 High Voltage System Interlock Circuit 'D' Low: No Sub Type Information This DTC sets when a difference is detected between the high voltage battery and the electric AC module.

    Possible Causes 

    • Wiring, terminals or connectors
    • ACCM

  2. BD1 REVIEW AND RECORD THE INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a diagnostic scan tool, run the Inverter System Controller (ISC) self-test.

    Is DTC U351F and/or U351B present? 

    Yes  For DTC U351B, GO to  BD2For DTC U351F, GO to Pinpoint Test BE  For both U351B and U351F, GO to Pinpoint Test BE 
    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.

  3. BD2 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) ELECTRIC COMPRESSOR HIGH VOLTAGE CABLE FOR BEING FULLY SEATED

    • Ignition OFF.

    • Check that the ACCM C1803B is connected and fully seated.

    Was the connector connected and fully seated? 

    Yes  GO to  BD3
    No  RECONNECT the connector and verify it is fully seated. Repower the high voltage system. REFER to: High Voltage System De-energizing .
    . Operate the system and determine if the concern is still present.

  4. BD3 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) ELECTRIC COMPRESSOR CONNECTORS

    • Ignition OFF.

    • Inspect connector ACCM C1803B

      • Connecters are fully seated
      • Corrosion (install new connector or terminals - clean module pins)
      • Damaged or bent pins - install new terminals/pins
      • Pushed-out pins - install new pins as necessary

    Where any issues found with the connectors? 

    Yes  INSTALL a new High Voltage Cable assembly. For PHEV REFER to: HIGH VOLTAGE BATTERY CHARGING SYSTEM - PLUG-IN HYBRID ELECTRIC VEHICLE (PHEV) . Or for HEV REFER to: HIGH VOLTAGE BATTERY CABLES - FULL HYBRID ELECTRIC VEHICLE (FHEV) . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.
    No  GO to  BD4

  5. BD4 CHECK FOR CORRECT ACCM (AIR CONDITIONING CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    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 address this concern, INSTALL a new ACCM. REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec - Hybrid (121kW/164PS) (BG) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.
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