41 AIRCONDITIONING C. TROUBLESHOOTINGON COOLER ELECTRICAL CIRCUIT 1. Troubleshooting Flow Chart After making sure that the blower circuit operation is good, troubleshoot the cooler circuit in the following procedures. STEP 1 CHECK A/C SWITCH FUNCTION STEP 2 CHECK MAGNETIC CLUTCH STEP 3 CHECK POWER SOURCE TO CLUTCH STEP 4 CHECK MAGNETIC CLUTCH RELAY STEP 5 CHECK OUTPUT FROM AMPLIFIER STEP 6 CHECK INPUT TO AMPLIFIER With blower operated, push on A/C switch, and check whether A/C switch lamp is lit. No With A/C switch and blower switches On, check whether magnetic clutch is On. Yes Check voltage of 1-pole connector for the magnetic clutch. Check voltages to clutch relay Connector No Battery Voltage or No Grounding Check output voltage from amplifier. Terminal 1A – OK No Good Inspect A/C fuse OK Blown or Bad Contact Check wiring between A/C fuse and the blower circuit. Check magnetic clutch coil. Step 4-1 Check relay and its wiring Check continuity of wiring between amplifier and magnetic clutch relay. Check input voltage to A/C fuse 12V Replace it Check A/C switch Check condenser Fan relay circuit 12V OK OK OK Check each input voltage and signal from sensor such as Thermistor, Dual Pressure S/W Engine RPM signal from eng. ECU. Also check the earth circuit for amplifier. OK Replace amplifier Check sensor and its wiring, which don't input correct signal. Important Also A/C idle up check should be done Visuallsy regardless of above troubleshooting result, No No Good OK
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