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.

AA1 CHECK FOR IGNITION RUN INPUT AT THE PCM

Access the PCM and monitor the KEYST (MODE) PID.
Ignition ON, engine OFF.

Does the PID indicate on?

Yes	No
GO to AA2.	GO to B4.

AA2 CHECK FOR IGNITION RUN/START INPUT AT THE PCM

Access the PCM and monitor the START_KEY (MODE) PID.
Attempt to start the engine.

Does the PID indicate on?

Yes	No
GO to AA5.	GO to AA3.

AA3 CHECK THE IGNITION RUN/START CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.
Turn the ignition to the START position and hold.
Measure the voltage between:

VOLTAGE REFERENCE CHART

(+) PCM Connector, Harness Side	(-) Vehicle Battery
ISP-R/S - Pin B39	Negative terminal

Is the voltage greater than 10 V?

Yes	No
GO to AA4.	CHECK for a damaged ignition switch. REFER to the COMPONENT TESTING (HYBRID) If the ignition switch is OK, REPAIR the circuit. Clear the PCM DTCs. REPEAT the self-test.

AA4 CHECK FOR GROUNDED IGNITION RUN/START CIRCUIT

Ignition OFF.
PCM connector disconnected.
Measure the resistance between:

RESISTANCE REFERENCE CHART

(+) PCM Connector, Harness Side	(-) Vehicle Battery
ISP-R/S - Pin B39	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to AA9.	CHECK the ignition switch for a short to ground. If OK, REPAIR the circuit. Clear the PCM DTCs. REPEAT the self-test.

AA5 CHECK THE VOLTAGE AND GROUND TO THE MODULES

Ignition ON, engine OFF.
Access the PCM and monitor the VPWR (VOLT) PID.
Access the TCM and monitor the VPWR_TCM (VOLT) PID.

Are the voltages greater than 10 V?

Yes	No
GO to AA6.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AA6 CHECK THE STATUS OF THE CONTACTORS

Ignition ON, engine OFF.
Access the TCM and monitor the CONTACT (MODE) PID.

Is the PID state CLOSED?

Yes	No
GO to AA7.	The traction battery voltage must be in the correct operating range for the contactors to close. Refer to the CHARGING SYSTEM - HIGH VOLTAGE TRACTION BATTERY , for high-voltage traction battery diagnosis.

AA7 CHECK HIGH VOLTAGE BATTERY POWER AT THE TRANSAXLE ASSEMBLY

Ignition ON, engine running.
Access the TCM and monitor the M_INV_V (VOLT) and G_INV_V (VOLT) PIDs.

Are the voltages between 216 - 400 V?

Yes	No
GO to AA8.	DIAGNOSE the high voltage supply concern to the transaxle assembly. GO to PINPOINT TEST TT .

AA8 CHECK FOR THE CORRECT VEHICLE MODE

Ignition ON, engine running.
Access the TCM and monitor the VEHMODE (MODE) PID.

Is the PID state DRIVING?

Yes	No
The PCM and the transaxle assembly are not the cause of the engine no start. REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , to continue diagnosis.	GO to AA9.

AA9 CHECK FOR CORRECT PCM OPERATION

Ignition OFF.
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.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , PROGRAMMING THE VID BLOCK FOR A REPLACEMENT PCM .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.