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 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 , to continue diagnosis.

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.

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

Do all modules indicate pass?

Yes	No
REFER to SYMPTOM CHARTS , GO to PINPOINT TEST QT , to continue diagnosis.	If only PCM indicates fail, GO to QA3. If only TCM indicates fail, GO to QA7. If both PCM and TCM indicates fail, GO to QA5. For network test or all other modules indicates fail, REFER to MODULE COMMUNICATIONS NETWORK , Communication Network Symptom Chart to continue diagnosis.

QA3 CHECK THE ETCREF CIRCUIT FOR VOLTAGE

Key in OFF position.
ETB connector disconnected.
Key ON, engine OFF.
Measure the voltage between:

(+) ETB Connector, Harness Side	(-) ETB Connector, Harness Side
ETCREF - Pin 5	ETCRTN - Pin 4

Is the voltage between 4.5 - 5.5 V?

Yes	No
REFER to MODULE COMMUNICATIONS NETWORK , Communication Network Symptom Chart to continue diagnosis.	GO to QA4.

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 - Pin B42	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.
PCM connector disconnected.
Connect a 5 amp fused jumper wire between the following:

Point A PCM Connector, Harness Side	Point B
PCMRC - Pin B38	Ground

Key ON, engine OFF.
Measure the voltage between:

(+) PCM Connector, Harness Side	(-)
VPWR - Pin B67, B68	Ground

Are the voltages greater than 10 V?

Yes	No
GO to QA6.	GO to PINPOINT TEST C .

QA6 CHECK THE PWRGND CIRCUITS FOR AN OPEN

Key in OFF position.
Measure the resistance between:

(+) PCM Connector, Harness Side	(-)
PWRGND - Pin B69, B70	Ground

Are the resistances less than 5 ohms?

Yes	No
REFER to MODULE COMMUNICATIONS NETWORK , Communication Network Symptom Chart to continue diagnosis.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

QA7 CHECK THE TCM FOR VOLTAGE

Key in OFF position.
Transaxle Assembly-A connector disconnected.
Measure the voltage between:

(+) Transaxle Assembly-A Connector, Harness Side	(-)
B+ - Pin 12	Ground

Is the voltage greater than 10 V?

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

QA8 CHECK THE TCM FOR GROUND

Measure the resistance between:

(+) Transaxle Assembly-A Connector, Harness Side	(-)
GND - Pin 2, 8	Ground
GND - Pin 2, 8	Ground

Are the resistances less than 5 ohms?

Yes	No
GO to QA9.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

QA9 CHECK THE VPWR CIRCUIT FOR AN OPEN

Key ON, engine OFF.
Measure the voltage between:

(+) Transaxle Assembly-A Connector, Harness Side	(-)
VPWR - Pin 4, 5	Ground

Is the voltage greater than 10 V?

Yes	No
REFER to MODULE COMMUNICATIONS NETWORK , Communication Network Symptom Chart to continue diagnosis.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.