A/C Condenser Fan High Speed Circuit Troubleshooting

A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE:

- Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative. Refer to the symptom troubleshooting index.
- Before doing symptom troubleshooting, check for powertrain DTCs.

1. Check the No. B31 (7.5 A) and the No. B47 (30 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 2.

NO -

Replace the fuse, and recheck. If the fuse blow again, check for a short in the No. B31 (7.5 A) or No. B47 (30 A) fuse circuits.

2. Remove the fan control relay from auxiliary under-hood relay box A, and test it Testing and Inspection.

Is the relay OK?

YES -

Go to step 3.

NO -

Replace the fan control relay.

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

4. Measure the voltage between fan control relay 5P socket terminal No. 13 and body ground.





Is there battery voltage?

YES -

Go to step 5.

NO -

Go to step 14.

5. Turn the ignition switch to OFF.

6. Check for continuity between fan control relay 5P socket terminal No. 5 and body ground.





Is there continuity?

YES -

Go to step 7.

NO -

Check for an open in the wire between the fan control relay and body ground. If the wire is OK, check for poor ground at G401.

7. Remove the A/C condenser fan relay from auxiliary under-hood relay box B.

8. Check for continuity between fan control relay 5P socket terminal No. 15 and A/C condenser fan relay 4P socket terminal No. 10.





Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the fan control relay and the A/C condenser fan relay.

9. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the ECM/PCM from damage.

10. Disconnect ECM/PCM connector A (44P).

11. Check for continuity between A/C condenser fan relay 4P socket terminal No. 10 and ECM/PCM connector A (44P) terminal No. 5.





Is there continuity?

YES -

Go to step 12.

NO -

Repair an open in the wire between the A/C condenser fan relay and the ECM/PCM.

12. Reconnect ECM/PCM connector A (44P).

13. Check the DTCs by selecting the DTC MENU (DTCs) from the HDS Initial Inspection and Diagnostic Overview.

Is DTC P0532, P0533, P2184 and/ or P2185 indicated?

YES -

- DTC P0532 indicated: Go to A/C pressure sensor circuit low voltage troubleshooting P0532.
- DTC P0533 indicated: Go to A/C pressure sensor circuit high voltage troubleshooting P0533.
- DTC P2184 indicated: Go to ECT sensor 2 circuit low voltage troubleshooting P2184.
- DTC P2185 indicated: Go to ECT sensor 2 circuit high voltage troubleshooting P2185.

NO -

Check for loose wires or poor connections at ECM/PCM connector A (44P). 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.

14. Remove the A/C condenser fan relay from auxiliary under-hood relay box B.

15. Measure the voltage between A/C condenser fan relay 4P socket terminal No. 10 and body ground.





Is there battery voltage?

YES -

Repair an open in the wire between the A/C condenser fan relay and the fan control relay.

NO -

Repair an open in the wire between the No. B31 fuse in the under-dash fuse/relay box, A/C diode A and the A/C condenser fan relay.