A/C Compressor Clutch Circuit Troubleshooting

1. Check the No. 11 (30A) fuse in the under-hood fuse/relay box, and the No. 22 (30A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to 2.
NO - Replace the fuse(s), and recheck.

2. Check the engine coolant temperature (use the Honda PGM Tester PGM-FI data list if possible).
Is the coolant temperature above nomal?
YES - Troubleshoot and repair the cause of the high engine coolant temperature.
NO - Go to 3.

3. Remove the compressor clutch relay from the under-hood fuse/relay box, and test it.
Is the relay OK?
YES - Go to 4.
NO - Replace the compressor clutch relay.
4. Measure the voltage between the No. 2 terminal of the compressor clutch relay 5P socket and body ground.


Is there battery voltage?
YES - Go to 5.
NO - Replace the under-hood fuse/relay box.

5. Connect the No. 1 and No. 2 terminals of the compressor clutch relay 5P socket with a jumper wire.


Does the compressor clutch click ?
YES - Go to 6.
NO - Go to 14.

6. Disconnect the jumper wire.

7. Turn the ignition switch ON (II).

8. Measure the voltage between the No. 5 terminal of the compressor clutch relay 5P socket and body ground.



Is there battery voltage?
YES - Go to 9.
NO - Repair open in the wire between the No. 22 fuse in the under-dash fuse/relay box and the compressor clutch relay.

9. Turn the ignition switch OFF.

10. Reinstall the compressor clutch relay.

11. Make sure the A/C switch is OFF.

12. Turn the ignition switch ON (II).

13. 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 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 compressor clutch relay and the ECM/ PCM.

14. Disconnect the jumper wire.

15. Disconnect the compressor clutch 1P connector.

16. Check for continuity between the No. 1 terminal of the compressor clutch relay 5P socket and the No. 1 terminal of the compressor clutch 1P connector.


Is there continuity?
YES - Check the compressor clutch clearance, the thermal protector, and the compressor clutch field coil.
NO - Repair open in the wire between the compressor clutch relay and the compressor clutch.