Check Open in Signal Circuit
- Ignition "OFF"
- Disconnect the alternator and ECM connectors.
- Measure resistance between Pin No. 1 (COM) terminal of alternator harness connector and Pin No. 69 (LIN) terminal of ECM harness connector.
Specification: Approx. below 1Ω
- Is the measured resistance within specification?
YES
- Go to "Check Short to Battery in Signal Circuit " procedure.
NO
- Repair or replace as necessary and then, go to "VERIFICATION OF REPAIR " procedure.