- Check the No. 4 (10 A) fuse in the under-hood fuse/relay box and the No. 14 (10 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 2.
NO - Replace the fuse(s) and recheck. 
- Check the engine coolant temperature.
Is the coolant temperature above normal?
YES - Troubleshoot and repair cause of high engine coolant temperature.
NO - Go to step 3.
- Remove the compressor clutch relay from the under-hood fuse/relay box and test it. Is the relay OK?
YES - Go to step 4.
NO - Replace the compressor clutch relay.
- Measure the voltage between the No.2 terminal of the compressor clutch relay 4P socket and body ground.
COMPRESSOR CLUTCH RELAY 4P SOCKET
Is there battery voltage?
YES - Go to step 5.
NO - Replace the under-hood fuse/relay box.
- 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 15.
- 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 PGM-FI main relay and the compressor clutch relay.