PSP Switch Signal Circuit Troubleshooting

PSP Switch Signal Circuit Troubleshooting

1. Start the engine, and let it idle.

2. Monitor the ALTERNATOR in the DATA LIST with the HDS.

3. Check if the indicated percentage varies when the headlight switch is turned on.

Does the percentage vary?
YES - The alternator signal circuit is OK.

NO - Go to step 4.


4. Turn the headlight switch OFF and the ignition switch to LOCK (0).

5. Jump the SCS line with the HDS.

6. Disconnect the alternator 4P connector.

7. Disconnect PCM connector B (44P).

8. Check for continuity between body ground and PCM connector terminal B43.

Is there continuity?
YES - Repair short in the wire between the PCM (B43) and the alternator.

NO - Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM, Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM. Service and Repair