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Home >> Ford >> 2023 >> Escape Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1127 (Electric Powertrain Control - 3.3L DURATEC-V6 - Hybrid (BP) (Diagnosis & Testing - Removal & Installation)) >> Diagnosis And Testing >> Electric Powertrain Control >> Pinpoint Tests >> Pinpoint Test AK: P0C79

Pinpoint Test AK: P0C79

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  1. 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 P0C79:00 Drive Motor "A" Inverter Voltage Too High: No Sub Type Information This DTC sets when a overvoltage event has occurred in the module.

    Possible Sources 

    • Loose high voltage cables
    • Service disconnect not connected
    • Wiring, terminals or connectors

  2. AK1 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are there any BECM or Inverter System Controller (ISC) DTCs? 

    Yes  DIAGNOSE and REPAIR any BECM or Inverter System Controller (ISC) DTCs. For BECMDTCs. Refer to High Voltage Battery, Mounting and Cables . For Inverter System Controller (ISC) DTCs. Refer to the Diagnostic Trouble Code (DTC) Chart 
    No  GO to  AK2

  3. AK2 VISUAL INSPECTION OF THE HIGH VOLTAGE SYSTEM

    • Ignition OFF.

    • Depower the high voltage battery.

    • 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 connections.

    Is a concern present? 

    Yes  REPAIR as necessary. CLEAR the DTCs and REPEAT the self-test.
    No  GO to  AK3

  4. AK3 VERIFY THE HIGH VOLTAGE TRACTION BATTERY STATE OF CHARGE

    • Ignition ON.

    • Access the SOBDMC and monitor the HVBAT_V (V) PID

    Is the voltage greater than 250 volts? 

    Yes  GO to  AK4
    No  CHARGE the high voltage traction battery. Refer to High Voltage Battery Charging - Hybrid Electric Vehicle (HEV) . CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

  5. AK4 VERIFY CONCERN IS PRESENT

    NOTE: Clearing the Inverter System Controller (ISC) Diagnostic Trouble Codes (DTCs) erases any Inverter System Controller (ISC) recorded freeze frame data. Record any Inverter System Controller (ISC) freeze frame information before proceeding any further. Refer to the scan tool instruction manual for freeze frame Parameter Identification (PID) menu.

    • Install the high voltage traction battery service disconnect plug.

    • Ignition ON.

    • Clear the Inverter System Controller (ISC) DTCs.

    Is DTC P0C79 present? 

    Yes  GO to  AK5
    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, the TRID block was not programmed correctly or was erased.

  6. AK5 CHECK THE HIGH VOLTAGE CABLES FOR AN INTERMITTENT CONCERN

    • Ignition OFF.

    • Disconnect and inspect all the High Voltage BJB connectors.

    • Disconnect and inspect all the Inverter System Controller (ISC) connectors.

    • Repair:

      • 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

    • Reconnect the High Voltage BJB connectors. Make sure they seat and latch correctly.

    • Reconnect the Inverter System Controller (ISC) connectors. Make sure they seat and latch correctly.

    • Install the high voltage traction battery service disconnect plug.

    • Ignition ON.

    • Access the SOBDMC and monitor the GEN_INV_V (V) PID.

    • Carefully wiggle all accessible wiring and connectors associated with the high voltage cable from the Inverter System Controller (ISC) to the traction battery, and look for a change in the PID state.

    Is a concern present during the wiggle or drive cycle test? 

    Yes  REPAIR as necessary.
    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.
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