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 powertrain DTCs. Initial Inspection and Diagnostic Overview
1. Check the No. 5 (20 A) and No. 21 (7.5 A) in the under-hood 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. 5 (20 A) fuse and No. 21 (7.5 A) fuse circuits.
2. Remove the relay circuit board Drivers Under-Dash Fuse/Relay Box (MICU) Removal and Installation (USA Models) from the under-hood fuse/relay box, and test the A/C condenser fan relay. Testing and Inspection
Is the relay OK?
YES - Go to step 3.
NO - Replace the relay circuit board.
3. Reinstall the relay circuit board.
4. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the engine control module/powertrain control module (ECM/PCM) from damage.
5. Disconnect ECM/PCM connector A (49P).
6. Turn the ignition switch to ON (II).
7. Measure the voltage between the ECM/PCM connector A (49P) terminal No. 6 and body ground.
Is there battery voltage?
YES - Go to step 8.
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
8. Turn the ignition switch to LOCK (0).
9. Connect the ECM/PCM connector A (49P) terminal No. 6 to body ground with a jumper wire.
10. Turn the ignition switch to ON (II).
Does the A/C condenser fan run on high?
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. ECM/PCM Replacement (A/T)
NO - Replace the under-hood fuse/relay box. Under-Hood Fuse/Relay Box Removal and Installation