Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1166 (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 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- 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: P0A09, 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 P0A09, P1A10, P1A0D, P1A0E. GO to QE3.
For all others, alone or in combination, GO to QE3. - 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. - QE3 CHECK FOR THE PRESENCE OF PCM DTC P0A09 NOTE: The PCM DTC P0A09 indicates the DC/DC Fault (DCF) circuit is shorted to ground, there is internal DC/DC damage, or the 12 V bus voltage dropped below calibrated threshold.
Is PCM DTC P0A09 present during the self-test?
Yes No REFER to the DIAGNOSIS AND TESTING , to diagnose the DTC P0A09. GO to QE4. - QE4 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:
(+) Transaxle Assembly-B Connector, Harness Side (-) Transaxle Assembly-B Connector, Harness Side TGAC - Pin 9 TMAC - Pin 4 TGAC - Pin 9 MSDN - Pin 5 TGAC - Pin 9 GSDN - Pin 10 TGAC - Pin 9 CTO - Pin 1 TMAC - Pin 4 MSDN - Pin 5 TMAC - Pin 4 GSDN - Pin 10 TMAC - Pin 4 CTO - Pin 1
Are the resistances greater than 10K ohms?
Yes No GO to Symptom Charts 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 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.