Connect the No. 1 and No. 2 terminals of the compressor clutch relay 4P socket with a jumper wire. COMPRESSOR CLUTCH RELAY 4P SOCKET Does the compressor clutch click ? YES - Go to step 6. NO - Go to step 14. Disconnect the jumper wire. Turn the ignition switch ON (II). Measure the voltage between the No. 3 terminal of the compressor clutch relay 4P socket and body ground. COMPRESSOR CLUTCH RELAY 4P SOCKET Is there battery voltage? YES - Go to step 9. NO - Repair open in the wire between the No. 14 fuse in the under-dash fuse/relay box and the compressor clutch relay.

Turn the ignition switch OFF. Reinstall the compressor clutch relay. Make sure the A/C switch is OFF. Turn the ignition switch ON (II). Measure the voltage between the No. 18 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected. ECM/PCM CONNECTOR E (31P) Is there battery voltage? YES - Check for loose wires or poor connections at ECM/PCM connector E (31P). If the connections are good, substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM. NO - Repair open in the wire between the compressor clutch relay and the ECM/PCM. Disconnect the jumper wire. Disconnect the compressor clutch 1P connector.