Test Procedure
- AD1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Carry out the PCM self-test.
- Record the freeze frame data.
- Clear the PCM DTCs.
- Carry out the PCM self-test.
Are any DTCs present?
Yes No DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . For symptoms without DTCs, GO to AD2. - AD2 CHECK THE VPWR CIRCUITS FOR VOLTAGE
- Ignition OFF.
- PCM-B connector disconnected.
- Connect a 5 amp fused jumper wire between the following:
Point A PCM-B Connector, Harness Side Point B PCMRC - Pin 38 Ground - Ignition ON, engine OFF.
- Measure the voltage between:
(+) PCM-B Connector, Harness Side (-) VPWR - Pin 67, 68, 69 Ground - Check for loose connections. Check for damaged pins or corrosion. Wiggle the harness while taking the measurements.
Is the voltage greater than 10 V?
Yes No GO to AD3. REPAIR the open circuit. Clear the PCM DTCs.
REPEAT the self-test. - AD3 CHECK THE PWRGND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Remove the jumper wire(s).
- 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 Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , if a driveability concern exists. REPAIR the open circuit. Clear the PCM DTCs.
REPEAT the self-test.