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.

QE1 CHECK FOR THE PRESENCE OF ANY DTCS OTHER THAN THE INFORMATIONAL DTCS

NOTE: The PCM DTC P1A0C with no other DTCs present indicates excessive start attempts, stalls with a hot catalyst or an issue with the 12-volt battery connections.

Are any DTCs present other than the following: P0606, P0613, P0726, P0727, P0A09, P0A27, P0A28, P1A03, P1A04, PA10D, P1A0E, P1A0F, P1A10, P1A11, P1A12, P1A13, P1A14, P2104, P2105, P2110?

Yes	No
For DTC P1A0C alone, GO to QE10. For all others, DTCs other than informational DTCs should be diagnosed in the following order: PCM KOEO, PCM KOER, TCM On Demand, PCM CONT and TCM CONT. DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to QE2.

QE2 CHECK FOR THE PRESENCE OF TCM DTCS P1A03 OR P1A04

DTC P1A03 without DTC P1A04 present indicates an MSDN circuit concern.
DTC P1A04 without DTC P1A03 present indicates a GSDN circuit concern.

DTCs P1A03 and P1A04 together indicate that PCM requested MSDN and GSDN because of some other concern.
Is TCM DTC P1A03 or P1A04 present during the self-test?

Yes	No
DTC P1A03 without DTC P1A04 present: refer to PINPOINT TEST TE . DTC P1A04 without DTC P1A03 present: refer to PINPOINT TEST TF . DTCs P1A03 and P1A04 together: GO to QE3.	GO to QE4.

QE3 CHECK MSDN AND GSDN PIDS

Access the TCM and monitor the M_SDN_A, M_SDN_C, G_SDN_A and G_SDN_C PIDs.
Do any of the PIDs indicate ON?

Yes	No
For M_SDN_A indicating ON: GO to QE4. For M_SDN_C indicating ON: GO to TE4 . For G_SDN_A indicating ON: GO to QE4. For G_SDN_C indicating ON: GO to TF4 .	GO to QE4.

QE4 CHECK FOR THE PRESENCE OF TCM DTC P0726 OR P0727

TCM DTC P0726 or P0727 with an engine that does not start indicates a missing CKP signal to the PCM.
TCM DTC P0726 or P0727 with an engine that starts and runs indicates a missing CTO signal to the TCM.
Are the TCM DTCs P0726 or P0727 present during self-test?

Yes	No
For DTC P0726 or P0727 and engine does not start: refer to PINPOINT TEST JD . For DTC P0726 or P0727 and engine starts and continues running: refer to PINPOINT TEST JH .	GO to QE5.

QE5 CHECK FOR THE PRESENCE OF PCM DTC P0A27 OR P0A28

PCM DTCs P0A27 or P0A28 indicate a battery power off (BPO) circuit failure or that the traction battery control module (TBCM) sent the BPO request to the PCM.
Are the PCM DTCs P0A27 or P0A28 present during self-test?

Yes	No
For DTCs P0A27 and P0A28, GO to FC2 .	GO to QE6.

QE6 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
For KOEO or KOER DTC P0A09: GO to HH17 . For continuous memory DTC P0A09: GO to HH23 .	GO to QE7.

QE7 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
For DTCs P2104, P2105 and P2110, GO to QE8. For all others, GO toSymptom Charts STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX . for further direction. If the symptom is not listed, REFER to Workshop Manual or GO TO Pinpoint Test Z, for intermittent PCM/TCM diagnostics.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

QE8 CHECK FOR THE PRESENCE OF ANY MODULE COMMUNICATION CONCERNS

Check for self-test DTCs in all of the vehicle modules.
Are any communication concerns or communication DTCs present?

Yes	No
For communication concerns in the PCM, DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . For communication concerns in other modules, REFER to the applicable article to diagnose the communication DTC.	GO to QE9.

QE9 CHECK FOR THE PRESENCE OF ANY ABS CONCERNS

Check for self-test DTCs in all of the vehicle modules.
Are any DTCs present?

Yes	No
REFER to the applicable article to diagnose the DTC.	GO to QE11.

QE10 DTC P1A0C: CHECK THE PCM LOSSTRT PID

Key ON, engine OFF.
Access the PCM and monitor the LOSSTRT PID.
Does the PID indicate YES?

Yes	No
GO toSTEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX and diagnose the engine no start or stalls/quits symptom.	CHECK the 12 volt battery and connections. REFER to HIGH VOLTAGE CONVERTER/INVERTER - HYBRID and diagnose the DC/DC converter does not operate correctly symptom.

QE11 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.