AC-65 AIR CONDITIONING SYSTEM – TROUBLESHOOTING 7 Check magnetic clutch relay. P Remove magnetic clutch relay from R/B No. 2. C Check continuity between each pair of terminals shown below of magnetic clutch relay. OK Terminals 1 and 2 Approx. 75 Ω Terminals 3 and 5 No continuity P 1. Apply battery positive voltage between terminals 1 and 2. 2. Check continuity between terminals 3 and 5. OK Terminals 3 and 5 Continuity N08833 OK NG Replace magnetic relay. 8 Check voltage between terminal ACMG of ECM and body ground. ON IG ON ECM BE6663 AC2997 ACMG P 1. Remove the ECM with connectors still connected. 2. Turn ignition switch on. C 1. Turn fan speed control dial (Lo, Med or Hi). 2. Measure voltage between terminal ACMG of the ECM connector and body ground. OK A/C Switch Voltage ON Approx. 1.3. V OFF Battery positive voltage ~ 1.3 V NG OK Proceed to next circuit inspection shown on matrix chart (See page AC-26). 9 Check for open and short in harness and connector between the ECM and battery (See page IN-30). OK NG Repair or replace harness or connector. Check and replace the ECM.