Component Tests and General Diagnostics

Radiator and Condenser Fans Common Circuit Troubleshooting

NOTE: Do not use this troubleshooting procedure if only one fan is inoperative, or it the compressor is inoperative. Refer to the symptom troubleshooting index. Symptom Related Diagnostic Procedures

1. Check the No, 1 (30 A) and No. 4 (20 A) fuses 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.

2. Remove the condenser fan relay from the under-hood fuse/relay box.
3. Turn the ignition switch ON (II).




4. Measure the voltage between the No. 3 terminal of the condenser fan relay 4P socket and body ground.

Is there battery voltage?

YES - Go to step 5.

NO - Repair open in the BLK/YEL wire between the No. 14 fuse in the under-dash fuse/relay box and the radiator fan relay socket, and the condenser fan relay socket.

5. Turn the ignition switch OFF.
6. Reinstall the condenser fan relay.
7. Make sure the A/C switch is OFF.
8. Turn the ignition switch ON (II).




9. Using the Backprobe Set, measure the voltage between the No. 12 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected.

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 radiator fan relay socket, the condenser fan relay socket and the ECM/PCM.