Radiator and A/C Condenser Fan Common Circuit Troubleshooting
Radiator and A/C Condenser Fan Common Circuit TroubleshootingNOTE:
- Do not use this troubleshooting procedure if only one fan is inoperative, or if the A/C compressor is inoperative/refer to the symptom troubleshooting index.
- Before performing symptom troubleshooting, check for powertrain DTCs.
1. Check the No. 1 (20 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 A/C 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 A/C condenser fan relay 4P socket and body ground.
Is there battery voltage?
YES - Go to step 5.
NO - Repair open in the wire between the No. 14 fuse in the under-dash fuse/relay box and the radiator fan relay, and the A/C condenser fan relay.
5. Turn the ignition switch OFF.
6. Reinstall the A/C condenser fan relay.
7. Make sure the A/C switch is OFF.
8. Turn the ignition switch ON (II).
9. Using a Backprobe Set, measure the voltage between the No. 6 terminal of ECM connector B (24P) and body ground with the ECM connectors connected.
Is there battery voltage?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Repair open in the wire between the radiator fan relay, the A/C condenser fan relay and the ECM.