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Pinpoint Test CN : P0CA3, P0A11

  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 P0A11:00 DC/DC Converter Enable Circuit/Open: No Sub Type Information This DTC sets when there is an internal issue within the Inverter System Controller (ISC).
    SOBDMC P0CA3:00 DC/DC Converter Step Up Voltage Performance: No Sub Type Information This DTC sets when an internal boost converter concern is detected.

    Possible Sources 

    • High voltage fuses
    • High voltage cables
    • Other Inverter System Controller (ISC) DTCs
    • Inverter System Controller (ISC) calibration
    • Inverter System Controller (ISC)

  2. CN1 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) CONTINUOUS MEMORY DIAGNOSTIC CODES (CMDTCS)

    • Ignition ON.

    • Using a diagnostic scan tool, check for CMDTCs.

    Are any CMDTC other than P0A11 or P0CA3 present? 

    Yes  DIAGNOSE all other Inverter System Controller (ISC) DTCs, REFER to Diagnostic Trouble Code (DTC) Chart .
    No  GO to  CN2

  3. CN2 VERIFY THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

    • Verify the Inverter System Controller (ISC) is at the latest calibration level.

    Is the Inverter System Controller (ISC) at the latest calibration level? 

    Yes  GO to  CN3
    No  UPDATE the Inverter System Controller (ISC) to the latest calibration level.

  4. CN3 VISUAL INSPECTION OF THE HIGH VOLTAGE SYSTEM

    • Ignition OFF.

    • Visually inspect all the high voltage cables.

    • Make sure all the high voltage connectors are correctly and securely connected.

    • Examine all the high voltage cables and connectors for damaged, burned or overheated insulation and loose or broken conditions.

    • Remove the Inverter System Controller (ISC) side cover. When removing side cover, pull cover straight out approximately 2 inches before moving upwards or damage to the high voltage interlock connector may occur. REFER to: Inverter System Controller [SOBDMC] .

    • Examine all the high voltage connections for damage and loose or broken conditions.

    • Verify the high voltage terminal bolts are fully seated and torqued to 8 lb.ft (10.5 Nm)

    Is a concern present? 

    Yes  REPAIR as necessary. CLEAR the Inverter System Controller (ISC) DTCs and REPEAT the self-test.
    No  GO to  CN4

  5. CN4 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a diagnostic scan tool, clear the Inverter System Controller (ISC) DTCs.

    • Ignition OFF.

    • Wait 5 minutes.

    • Ignition ON.

    • Wait 10 seconds.

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

    Are any other DTCs other than P0A11 or P0CA3 present? 

    Yes  DIAGNOSE all other Inverter System Controller (ISC) DTCs, REFER to Diagnostic Trouble Code (DTC) Chart .
    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 address this concern, INSTALL a new Inverter System Controller (ISC). REFER to: Inverter System Controller [SOBDMC] .
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