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HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1484 (ENGINE CONTROLS - PINPOINT TESTS (HYBRID))PINPOINT TEST QE: HYBRID-ELECTRIC SYSTEMTEST PROCEDURE
2005 Ford Taurus SEL, 4D Sedan

Test Procedure

2005 Ford Taurus SEL, 4D SedanSECTION Test Procedure
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. QE1 CHECK FOR THE PRESENCE OF ANY DTCS OTHER THAN THE INFORMATIONAL DTCS 
    NOTE: Informational DTCs are P1A10, P1A0C, P1A0D, and P1A0E.

    Are any DTCs present other than the following: P1A10, P1A0C, P1A0D, or P1A0E? 

    Yes No
    DTCs other than informational DTCs should be diagnosed in the following order: PCM KOEO, PCM KOER, TCM On Demand, PCM CONT and TCM CONT. Refer to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . For DTC P1A0C alone, GO to  QE2.
    For DTC P1A0C in combination with DTCs P1A10, P1A0D, or P1A0E, GO to  QE3.
    For all others, alone or in combination, GO to  QE3.
  2. QE2 ATTEMPT TO START THE ENGINE 
    NOTE: The engine may attempt to start three times.
    • Start the engine using the engine running diagnostic mode. Refer to DIAGNOSTIC MODES . Allow the engine to idle for 1 minute.

    Does the engine start and run for at least one minute? 

    Yes No
    GO to PINPOINT TEST DV . REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHARTS . FOLLOW the Engine/Vehicle Starting Concerns: No Start/Normal Crank symptom directions to continue diagnosis.
  3. QE3 CHECK FOR TGAC AND TMAC CIRCUITS SHORTED TO SIGNALS IN THE SAME HARNESS 
    • PCM connector disconnected.
    • Transaxle Assembly-B connector disconnected.
    • Measure the resistance between:
    RESISTANCE REFERENCE CHART

    (+) Transaxle Assembly-B Connector, Harness Side (-) Transaxle Assembly-B Connector, Harness Side
    TGAC - Pin 9 TMAC - Pin 4
    TGAC - Pin 9 GMSDN - Pin 5
    TGAC - Pin 9 CTO - Pin 1
    TMAC - Pin 4 GMSDN - Pin 5
    TMAC - Pin 4 CTO - Pin 1

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for further direction. If the symptom is not listed, REFER to or GO to PINPOINT TEST Z , for intermittent PCM/TCM diagnostics. REPAIR the circuit.
    Clear the PCM DTCs. REPEAT the self-test.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.