Radiator And A/C Condenser Fan Common Circuit Troubleshooting (With A/C)

Radiator and A/C Condenser Fan Common Circuit Troubleshooting

NOTE: Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.

1. Remove the radiator fan relay and A/C condenser fan relay from the auxiliary under-hood relay box, and test them. Testing and Inspection

Are the relays OK?
YES - Go to step 2.

NO - Replace the relays.


2. Reinstall the relays.

3. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the engine/powertrain control module (ECM/PCM) from damage.

4. Disconnect ECM/PCM connector A (49P).

5. Connect the ECM/PCM connector A (49P) terminal No. 6 to body ground with a jumper wire.

6. Turn the ignition switch to ON (II).

Do the fans run?
YES - Check for loose wires or poor connections at ECM/PCM connector A (49P). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM Service and Repair.

NO - Repair open in the wire between the radiator fan relay, the A/C condenser fan relay, and the ECM/PCM.