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 SETUP AND FUNCTIONALITY .

Was the correct self-test procedure used?

Yes	No
GO to QA2.	REFER to SCAN TOOL SETUP AND FUNCTIONALITY .

QA2 CARRY OUT THE NETWORK TEST

NOTE: When using Integrated Diagnostic System (IDS), the scan tool attempts to communicate with the PCM first. After establishing communication with the PCM, the scan tool then attempts to communicate with all modules on the vehicle. If an IDS session cannot be established, IDS may state no communication can be established with the PCM:

choose No when the scan tool prompts whether or not to retry communication.
enter a PCM part number, tear tag or calibration number to identify the vehicle and start a session. The PCM part number and 4-character tear tag are located on the PCM.

Ignition ON, engine OFF.
Carry out the network test.

Do all modules indicate pass?

Yes	No
For DTCs U0101 or U0402, GO to QA8. For DTCs U0121, U0415 or U1039, GO to QA9. For DTC U0140, GO to QA10. For DTCs U0155 or U0423, GO to QA11. For DTC U0422, GO to QA10. For all others, REFER to Symptom Charts, GO to PINPOINT TEST QT .	If 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 the PCM does not respond to the scan tool or no high speed controller area network (CAN) communication, all modules are not responding symptom.

QA3 CHECK FOR VREF VOLTAGE AT A SENSOR

Ignition ON, engine OFF.
For electronic throttle control (ETC) applications,
ETBTPS connector disconnected.

Measure the voltage between:

VOLTAGE REFERENCE CHART

(+) ETBTPS Connector, Harness Side	(-) ETBTPS Connector, Harness Side
ETCREF	ETCRTN

For all others,
TP Sensor connector disconnected.

Measure the voltage between:

VOLTAGE REFERENCE CHART

(+) TP Sensor Connector, Harness Side	(-) TP Sensor Connector, Harness Side
VREF	SIGRTN

Is the voltage between 4.5 - 5.5 V?

Yes	No
REFER to the appropriate Module Communications Network article , to diagnose the PCM does not respond to the scan tool or no high speed controller area network (CAN) communication, all modules are not responding symptom.	For Crown Victoria, Grand Marquis, Ranger, and Town Car, GO to QA6. For all others, GO to QA4.

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

Ignition OFF.
PCM connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

VOLTAGE REFERENCE CHART

(+) 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 PCM DTCs. REPEAT the self-test.

QA5 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE

Ignition OFF.
Disconnect the PCM.

Connect a 5 amp fused jumper wire between the following:

CONNECTOR PINS REFERENCE CHART

Point A PCM Connector, Harness Side	Point B
PCMRC	Ground

Ignition ON, engine OFF.

Measure the voltage between:

VOLTAGE REFERENCE CHART

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

Is the voltage greater than 10 V?

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

QA6 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE

Ignition OFF.
PCM connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

VOLTAGE REFERENCE CHART

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

Is the voltage greater than 10 V?

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

QA7 CHECK THE PCM GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Measure the resistance between:

RESISTANCE REFERENCE CHART

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

Is the resistance less than 5 ohms?

Yes	No
GO to QA12.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

QA8 CHECK FOR A TRANSAXLE/TRANSMISSION CONTROL MODULE (TCM) CONCERN

Check for any TCM DTCs.
Check for other TCM related symptoms.

Is a concern present?

Yes	No
REFER to the appropriate Automatic Transmission article, DTC Charts to continue diagnosis.	GO to QA12.

QA9 CHECK FOR AN ANTI-LOCK BRAKE SYSTEM (ABS) MODULE CONCERN

Check for any ABS module DTCs.
Check for other ABS related symptoms.

Is a concern present?

Yes	No
REFER to the appropriate Vehicle Dynamic Systems article, DTC Charts to continue diagnosis.	GO to QA12.

QA10 CHECK FOR A BODY CONTROL MODULE (BCM) CONCERN

Check for any BCM DTCs.
Check for other BCM related symptoms.

Is a concern present?

Yes	No
REFER to the appropriate Multifunction Electronic Modules article, DTC Charts to continue diagnosis.	GO to QA12.

QA11 CHECK FOR AN INSTRUMENT PANEL CLUSTER CONTROL MODULE CONCERN

Check for any instrument panel cluster control module DTCs.
Check for other instrument panel cluster control module related symptoms.

Is a concern present?

Yes	No
REFER to the appropriate Instrumentation, Message Center and Warning Chimes article, DTC Charts to continue diagnosis.	GO to QA12.

QA12 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 network test and verify the concern is still present.
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.