Test Procedure

AJ1 CHECK FOR DTCS

Are DTCs P0685, P068A, P2507 or P2508 present?

Yes	No
GO to AJ2 .	For symptoms without DTCs, GO to AJ3. For all others, RETURN to SYMPTOM CHARTS for further direction.

AJ2 CHECK THE BATTERY AND CHARGING SYSTEM

Check the battery and charging system voltages. Refer to the service information , Charging System, Inspection and Verification.

Are the battery and charging system voltages within specifications?

Yes	No
GO to AJ3 .	REPAIR as necessary. REFER to the service information , Charging System, Symptom Chart to diagnose the system voltage low or battery is discharged symptom or the system voltage high symptom. Clear the PCM DTCs. REPEAT the self-test.

AJ3 CHECK THE PCM POWER RELAY

Carry out the PCM power relay component test. Refer to the service information Component Testing.

Did the PCM power relay pass the component test?

Yes	No
GO to AJ4 .	INSTALL a new PCM Power Relay. Clear the PCM DTCs. REPEAT the self-test.

AJ4 CHECK THE B+ CIRCUITS FOR VOLTAGE

Ignition OFF.
PCM Power Relay connector disconnected.

Measure the voltage between:

(+) PCM Power Relay Connector, Harness Side	(-)
B+ - Pin 2, 3	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to AJ5 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AJ5 CHECK THE PCMRC CIRCUIT FOR AN OPEN

PCM-B connector disconnected.

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-) PCM Power Relay Connector, Harness Side
PCMRC - Pin 38	PCMRC - Pin 1

Is the resistance less than 5 ohms?

Yes	No
GO to AJ6 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AJ6 CHECK THE PCMRC CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-)
PCMRC - Pin 38	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to AJ7 .	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

AJ7 CHECK THE PCMRC CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) PCM-B Connector, Harness Side	(-)
PCMRC - Pin 38	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to AJ8 .

AJ8 CHECK THE ISP-R CIRCUIT FOR VOLTAGE

Ignition OFF.
PCM Power Relay connector connected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) PCM-B Connector, Harness Side	(-)
ISP-R - Pin 42	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to AJ9 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AJ9 CHECK THE ISP-R CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Measure the voltage between:

(+) PCM-B Connector, Harness Side	(-)
ISP-R - Pin 42	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to AJ10 .

AJ10 CHECK THE VPWR CIRCUIT FOR AN OPEN

PCM Power Relay connector disconnected.

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-) PCM Power Relay Connector, Harness Side
VPWR - Pin 67, 68, 69	VPWR - Pin 5

Are the resistances less than 5 ohms?

Yes	No
GO to AJ11 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AJ11 CHECK THE PWRGND CIRCUITS FOR AN OPEN

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-)
PWRGND - Pin 70, 71, 72, 73, 74	Ground

Are the resistances less than 5 ohms?

Yes	No
GO to AJ12 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AJ12 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.
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.