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 A/C compressor is inoperative. Refer to the symptom troubleshooting index.
- Before doing any symptom troubleshooting, check for PGM-FI DTCs Initial Inspection and Diagnostic Overview.

1. Check the No. 3-3 (SUB FAN) (30 A) fuse in the under-hood fuse/relay, and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are the fuses OK?

YES -

Go to step 2.

NO -

Replace the fuse(s), and recheck. If fuse(s) blow again, check for a short in the No. 3-3 (SUB FAN) (30 A) fuse in the under-hood fuse/relay, and the No. 16 (7.5 A) fuse circuits.

2. Jump the SCS line with the HDS.

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

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

4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

5. Measure the voltage between ECM/PCM connector A terminal No. 5 and body ground.





Is there battery voltage?

YES -

Go to step 6.

NO -

Repair an open in the wire between the under-hood fuse/relay box and the ECM/PCM. If the wire is OK, replace the under-hood fuse/relay box Under-Hood Fuse/Relay Box Removal and Installation.

6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

7. Connect the ECM/PCM connector A (49P) terminals No. 4, No. 5, and No. 40 to body ground with jumper wires.






8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

Does the A/C condenser fan and radiator fan run on high?

YES -

Check for loose wires or poor connections at ECM/PCM connector A (49P) terminals No. 4, No. 5, and No. 40. 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 -

Go to step 9.

9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

10. Disconnect under-hood fuse/relay box connector C (5P).

11. Check for continuity between under-hood fuse/relay box connector C (5P) terminal No. 2 and body ground.





Is there continuity?

YES -

Replace the under-hood fuse/relay box Under-Hood Fuse/Relay Box Removal and Installation.

NO -

Check for an open in the wire between the under-hood fuse/relay box and body ground. If the wire is OK, check for poor ground at G301 Engine Compartment Wire Harness.