A/C Compressor Clutch Circuit Troubleshooting
A/C Compressor Clutch Circuit TroubleshootingNOTE: Do not use this troubleshooting procedure if the fans are also inoperative, refer to the symptom troubleshooting index. Symptom Related Diagnostic Procedures
1. Check the No. 9 (20 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 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. Connect the HDS to the DLC.
3. Start the engine.
4. Turn on the A/C.
5. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
Are all the values within specifications?
YES - Go to step 6.
NO - Troubleshoot the value that is not within the specifications.
6. Turn the ignition switch OFF.
7. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it.
Is the relay OK?
YES - Go to step 8.
NO - Replace the A/C compressor clutch relay.
8. Measure the voltage between the No. 1 terminal of A/C compressor clutch relay 4P socket and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Replace the under-hood fuse/relay box.
9. Connect the No. 1 and No. 2 terminals of the A/C compressor clutch relay 4P socket with a jumper wire.
Does the A/C compressor clutch click?
YES - Go to step 10.
NO - Go to step 18.
10. Disconnect the jumper wire.
11. Turn the ignition switch ON (II).
12. Measure the voltage between the No. 4 terminal of A/C compressor clutch relay 4P socket and body ground.
Is there battery voltage?
YES - Go to step 13.
NO - Repair open in the BLK/YEL wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay.
13. Turn the ignition switch OFF.
14. Reinstall the A/C compressor clutch relay.
15. Turn the ignition switch ON (II).
16. Make sure the A/C switch is OFF.
17. Using a backprobe set, measure the voltage between the No. 18 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected.
Is there battery voltage?
YES - Check for loose wires or poor connections at terminal E18 of the ECM/PCM connector E (31P). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM.
NO - Repair open in the wire between the A/C compressor clutch relay and the ECM/PCM.
18. Disconnect the jumper wire.
19. Disconnect the A/C compressor clutch 3P connector.
20. Check for continuity between the No. 2 terminal of A/C compressor clutch relay 4P socket and the No. 2 terminal of the A/C compressor clutch 3P connector.
Is there continuity?
YES - Check the A/C compressor clutch clearance, and the A/C compressor clutch field coil. Repair as needed.
NO - Repair open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.