Test Procedure

QA1 CARRY OUT A VEHICLE INSPECTION AND VERIFY THE SELF-TEST PROCEDURE

NOTE: If the self-test or communication concern occurred after a failed or an aborted reprogram, the module may be blank. Attempt to reprogram the module again before continuing with this pinpoint test.

Visually inspect the following for obvious signs of electrical damage:
- harness wiring
- electrical connections
Verify the correct procedure was used to activate the self-test for the scan tool. Refer to Scan Tool Set-up and Functionality.
Was the correct self-test procedure used?

Yes	No
GO to QA2.	REFER to Scan Tool Set-up and Functionality.

QA2 CARRY OUT THE NETWORK TEST

Key ON, engine OFF.
Carry out the network test.
Do all modules indicate pass?

Yes	No
REFER to Symptom Charts, PINPOINT TEST QT .	For only PCM indicates fail, GO to QA3. For network test or all other modules indicates fail, REFER to the appropriate MODULE COMMUNICATIONS NETWORK article to diagnose no response from the scan tool.

QA3 CHECK FOR VREF VOLTAGE AT A SENSOR

NOTE: PCM voltage and ground can be determined by measuring VREF voltage at a sensor. Refer to the VREF Information Table at the beginning of this pinpoint test for the vehicle application and the applicable sensor to test.

Key in OFF position.
Disconnect the applicable sensor.
Key ON, engine OFF.
Measure the voltage between the applicable sensor VREF circuit, harness side and the applicable sensor SIGRTN circuit, harness side.
Is the voltage between 4.5 - 5.5 V?

Yes	No
REFER to the appropriate MODULE COMMUNICATIONS NETWORK article to diagnose no communication with the PCM.	For Fusion, Milan, MKZ, Explorer, Explorer Sport Trac, Mountaineer, F-150, Mark LT, Mustang, Edge, MKX, Expedition, and Navigator, GO to QA4. For all others, GO to QA6.

QA4 CHECK THE ISP-R VOLTAGE AT THE PCM HARNESS CONNECTOR

Key in OFF position.
PCM connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) PCM Connector, Harness Side	( - )
ISP-R	Ground

Is the voltage greater than 10 V?

Yes	No
GO to QA5.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

QA5 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE

Key in OFF position.
Disconnect the PCM.

Connect a 5 amp fused jumper wire between the following:

Point A PCM Connector, Harness Side	Point B
PCMRC	Ground

Key ON, engine OFF.

Measure the voltage between:

( + ) PCM Connector, Harness Side	( - )
VPWR	Ground

Are the voltages greater than 10 V?

Yes	No
GO to QA7.	refer to PINPOINT TEST B .

QA6 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE

Key in OFF position.
Disconnect the PCM.
Key ON, engine OFF.

Measure the voltage between:

( + ) PCM Connector, Harness Side	( - )
VPWR	Ground

Are the voltages greater than 10 V?

Yes	No
GO to QA7.	refer to PINPOINT TEST B .

QA7 CHECK THE PCM GROUND CIRCUITS FOR AN OPEN

Key in OFF position.

Measure the resistance between:

( + ) PCM Connector, Harness Side	( - )
PWRGND	Ground

Are the resistances less than 5 ohms?

Yes	No
GO to QA8.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

QA8 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- corrosion
- pushed out pins
Connect all the PCM connectors and make sure they seat correctly.
Carry out the network test and 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) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.