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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. HH1 DIAGNOSTIC TROUBLE CODES (DTCS) P0A08, P0A10, P0A11, P0A12 AND P0A13: CHECK FOR SELF-TEST DTCS 
    NOTE: Repair any DTCs related to the motor electronics coolant temperature (MECT) or contactors before entering this pinpoint test.
    NOTE: The 12-volt battery must be sufficiently charged for DC/DC diagnostics.
    NOTE: The traction battery (TB) must be at a minimum of 35% state of charge for the PCM to activate the DCE circuit with the KOER position.
    • Are DTCs P0A08, P0A10, P0A11, P0A12, P0A13 present during PCM or transaxle control module (TCM) self-test? 
    Yes No
    For KOEO and KOER DTC P0A08, GO to  HH2.
    For KOEO and KOER DTC P0A10, GO to  HH17.
    For KOEO and KOER DTCs P0A11, P0A12 and P0A13, GO to  HH11.
    For continuous memory DTCs P0A08, P0A10, P0A11, P0A12 and P0A13, GO to  HH23.    		 Unable to duplicate or identify the concern at this time.
    RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
  2. HH2 KOEO AND KOER DTC P0A08: CHECK IF THE VEHICLE ENGINE STARTS 
    • Does the engine start? 
    Yes No
    GO to  HH5. GO to  HH3.
  3. HH3 CHECK THE HIGH VOLTAGE BATTERY CONTACTOR STATUS 
    • Key ON, engine OFF.
    • Access the TCM and monitor the CONTACT PID.
    • Does the PID indicate the contactors are closed? 
    Yes No
    GO to  HH4. Unable to close the traction battery contactors.
    REFER to HIGH VOLTAGE TRACTION BATTERY - HYBRID .
  4. HH4 CHECK THE TRANSAXLE ASSEMBLY HIGH VOLTAGE 
    • Access the TCM and monitor the HVBAT_V PID.
    • Is the voltage between 216 - 400 V? 
    Yes No
    GO to  HH5. DIAGNOSE the high voltage supply concern.
    GO to TT8 .
  5. HH5 VERIFY THE MECT 
    NOTE: High MECT limits DC/DC converter performance.
    • Access the PCM and monitor the MECT_V PID.
    • Reference the voltage transfer function table in Pinpoint Test DN.
    • Is the temperature less than 65°C (149°F)? 
    Yes No
    GO to  HH6. DIAGNOSE the MECT sensor concern.
    GO to DN2 .
  6. HH6 VERIFY THE LOW VOLTAGE BATTERY CONNECTIONS ON THE DC/DC CONVERTER 
    • Key in OFF position.
    • Check the low voltage battery connections on the DC/DC converter for corrosion and the proper connection.
    • Measure the voltage at the DC/DC converter low voltage battery connections.
    • Does the voltage read +/- 0.1 volt of 12-volt battery voltage? 
    Yes No
    GO to  HH7. REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.
  7. HH7 CHECK THE HIGH VOLTAGE POSITIVE CABLE FOR AN OPEN 
    • Key in OFF position.
    • Transaxle Assembly-DDHV connector disconnected.
    • DDC-HV connector disconnected.
    • Measure the resistance between:
      ( + ) Transaxle Assembly-DDHV Connector, Harness Side ( - ) DDC-HV Connector, Harness Side
      HVP - Pin (+) HVP - Pin (+)
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  HH8. INSTALL a new high voltage cable from the transaxle assembly to the DC/DC converter. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID .
  8. HH8 CHECK THE HIGH VOLTAGE NEGATIVE CABLE FOR AN OPEN 
    • Measure the resistance between:
      ( + ) Transaxle Assembly-DDHV Connector, Harness Side ( - ) DDC-HV Connector, Harness Side
      HVN - Pin (-) HVN - Pin (-)
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  HH9. INSTALL a new high voltage cable from the transaxle assembly to the DC/DC converter. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID .
  9. HH9 CHECK FOR THE DC/DC CONVERTER OVERCHARGING THE LOW VOLTAGE BATTERY 
    NOTE: Disconnecting the DCE circuit activates the DC/DC converter with the key in the ON position.
    • DDC-HV connector connected.
    • Transaxle Assembly-DDHV connector connected.
    • Key ON, engine OFF.
    • DDC-A connector disconnected.
    • Measure the voltage between:
      ( + ) Vehicle Battery ( - ) Vehicle Battery
      Positive terminal Negative terminal
    • Is VBAT less than 16 volts when the DC/DC converter is enabled? 
    Yes No
    GO to  HH10. INSTALL a new DC/DC converter. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID .
  10. HH10 CHECK FOR DTC P0A11, P0A12, OR P0A13 DC/DC ENABLE CIRCUIT CONCERNS 
    • Are DTCs P0A11, P0A12, or P0A13 present? 
    Yes No
    GO to  HH11. GO to  HH18.
  11. HH11 CHECK THE FUNCTIONALITY OF DC/DC CONVERTER 
    NOTE: Disconnecting the DCE circuit activates the DC/DC converter with the key in the ON position.
    • Key in OFF position.
    • DDC-A connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) Vehicle Battery ( - ) Vehicle Battery
      Positive terminal Negative terminal
    • Record the 12-volt battery voltage.
    • Key in OFF position.
    • Record the 12-volt battery voltage.
    • Does the 12-volt battery voltage increase when the key is in the ON position? 
    Yes No
    GO to  HH12. INSTALL a new DC/DC converter. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID .
  12. HH12 CHECK THE DCE CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) DDC-A Connector, Harness Side ( - ) PCM Connector, Harness Side
      DCE - 3259 - Pin 1 DCE - Pin T44
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  HH13. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  13. HH13 CHECK THE DCE CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      DCE - Pin T44 Negative terminal
    • Is the voltage less than 1 V? 
    Yes No
    GO to  HH14. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  14. HH14 CHECK THE DCE CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      DCE - Pin T44 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  HH15. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  15. HH15 CHECK THE FUNCTIONALITY OF THE DCE CIRCUIT 
    • Key ON, engine OFF.
    • Connect a 5 amp fused jumper wire between the following:
      Point A DDC-A Connector, Component Side Point B Vehicle Battery
      DCE - 3259 - Pin 1 Negative terminal
    • Measure the voltage between:
      ( + ) Vehicle Battery ( - ) Vehicle Battery
      Positive terminal Negative terminal
    • Does VBAT drop approximately 1 volt when the jumper wire is installed (forcing the DC/DC to disable), and increase approximately 1 volt when the jumper wire is removed (forcing the DC/DC to enable)? 
    Yes No
    GO to  HH16. INSTALL a new DC/DC converter. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID .
  16. HH16 CHECK THE FUNCTIONALITY OF THE PCM DCE CIRCUIT 
    • Key in OFF position.
    • DDC-A connector connected.
    • PCM connector connected.
    • Measure the voltage between:
      ( + ) Vehicle Battery ( - ) Vehicle Battery
      Positive terminal Negative terminal
    • Key ON, engine OFF.
    • Access the PCM and control the DCE PID.
    • Enable and disable the DCE circuit.
    • Does VBAT indicate the DC/DC converter is cycling on and off with output state control? 
    Yes No
    CLEAR the DTCs.
    GO to  HH17.    		 GO to  HH24.
  17. HH17 KOEO AND KOER DTC P0A10: CHECK FOR DTC P0A11, P0A12, OR P0A13 DC/DC ENABLE CIRCUIT CONCERNS 
    • Are any of the following on-demand DTCs present: P0A11, P0A12, or P0A13 ? 
    Yes No
    GO to  HH11. GO to  HH18.
  18. HH18 CHECK THE DCF CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • DDC-A connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) DDC-A Connector, Harness Side ( - ) PCM Connector, Harness Side
      DCF - 3989 - Pin 6 DCF - Pin T34
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  HH19. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  19. HH19 CHECK THE DCF CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      DCF - Pin T34 Negative terminal
    • Is the voltage less than 1 V? 
    Yes No
    GO to  HH20. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  20. HH20 CHECK THE DCF CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      DCF - Pin T34 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  HH21. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  21. HH21 CHECK THE DCF CIRCUIT FOR AN OPEN IN THE PCM 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Component Side ( - ) PCM Connector, Component Side
      VPWR - Pin B35, B36 DCF - Pin T34
    • Is the resistance between 1K - 2K ohms? 
    Yes No
    GO to  HH22. GO to  HH24.
  22. HH22 CHECK THE DCF CIRCUIT FOR A SHORT TO GND IN THE PCM 
    • DDC-A connector connected.
    • PCM connector connected.
    • Disconnect the DCF pin from the DDC-A connector.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) DDC-A Connector, Harness Side ( - )
      DCF - 3989 - Pin 6 Ground
    • Is the voltage less than 10.5 V? 
    Yes No
    GO to  HH24. INSTALL a new DC/DC converter. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID .
  23. HH23 CHECK THE DC TO DC CONVERTER CIRCUITS FOR AN INTERMITTENT CONCERN 
    NOTE: The continuous memory PCM DTC P0A09 alone indicates the intermittent DC/DC fault (DCF) circuit failure, or the 12 V bus voltage dropped below the calibrated threshold.
    • Key ON, engine OFF.
    • Access the PCM and monitor the DCE PID.
    • Access the PCM and monitor the DCE_F PID.
    • Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.
    • Does the PID indicate a concern while wiggling the harness or connectors? 
    Yes No
    REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.    		 Unable to duplicate or identify the concern at this time.
    Make sure the 12-volt battery is sufficiently charged.
  24. HH24 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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