Check for continuity between ECM connector terminal B18 and body ground. ECM CONNECTOR B (24P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the alternator and ECM. NO - Substitute a known-good ECM, and recheck (see page 11-5). If prescribed voltage is now available, replace the original ECM. Turn the headlights and ignition switch OFF. Disconnect ECM connector B (24P).

Check for continuity between ECM connector terminal B18 and engine wire harness 6P connector terminal No. 2. ECM CONNECTOR B (24P) ENGINE WIRE HARNESS 6P CONNECTOR Wire side of female terminals Is there continuity? YES - Repair the alternator (see page 4-29). NO - Repair open in the wire between the alternator and ECM. aaa