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Test Procedure

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. FC1 DIAGNOSTIC TROUBLE CODE (DTC) P0A27: CHECK FOR SELF-TEST DTCS 
    • Is traction battery control module (TBCM) DTC P0A27 present during self-test? 
    Yes No
    For KOEO and KOER DTC P0A27, GO to  FC2.
    For continuous memory DTC P0A27, GO to  FC7.    		 Unable to duplicate or identify the concern at this time.
    RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
  2. FC2 CHECK THE BATTERY POWER OFF PID FREQUENCY 
    • Access the PCM and monitor the BPO_HZ PID.
    • Is the frequency between 1.96 - 2.04 Hz? 
    Yes No
    GO to  FC7. GO to  FC3.
  3. FC3 CHECK THE BATTERY POWER OFF CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • TB-A connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) TB-A Connector, Harness Side
      BPO - Pin B24 BPO - Pin 8
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  FC4. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  4. FC4 CHECK THE BATTERY POWER OFF CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      BPO - Pin B24 Negative terminal
    • Is the voltage less than 1 V? 
    Yes No
    GO to  FC5. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  5. FC5 CHECK THE BATTERY POWER OFF CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      BPO - Pin B24 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  FC6. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  6. FC6 CHECK THE BATTERY POWER OFF CIRCUIT INTEGRITY 
    • PCM connector connected.
    • TB-A connector connected.
    • Isolate the BPO circuit at the TB-A connector.
    • Connect a 5 amp fused jumper wire between the following:
      Point A TB-A Connector, Harness Side Point B PCM Connector, Harness Side
      BPO - Pin 8 MSDN - Pin T11
    • Key ON, engine OFF.
    • Access the PCM and monitor the BPO_HZ PID.
    • Is the PID frequency between 49 and 75 Hz? 
    Yes No
    REFER to HIGH VOLTAGE TRACTION BATTERY - HYBRID to continue the battery power off circuit diagnosis. GO to  FC8.
  7. FC7 CHECK THE BPO CIRCUIT FOR AN INTERMITTENT CONCERN 
    • Key in OFF position.
    • PCM connector connected.
    • Transaxle Assembly-A connector connected.
    • Key ON, engine OFF.
    • Access the PCM and monitor the BPO_HZ PID.
    • Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.
    • Is a concern indicated during the wiggle test? 
    Yes No
    REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.    		 refer to PINPOINT TEST Z .
  8. FC8 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new PCM.
    REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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