Alternator FR 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.n
NO - Go to 4.
|4.||Turn the headlight switch and ignition switch OFF.|
|5.||Jump the SCS line with the HDS.|
|6.||Disconnect the alternator 4P connector.|
|7.||Disconnect ECM/PCM connector B (44P).|
|8.||Check for continuity between body ground and ECM/PCM connector terminal B43.|
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (B43) and the alternator.n
NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n