Civic L4-1.8L (2006)
Compressor Clutch: Testing and Inspection
A/C Compressor Clutch Circuit Troubleshooting
A/C Compressor Clutch Circuit Troubleshooting
NOTE:
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It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine coolant temperature, or hard acceleration.
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Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the symptom troubleshooting index. See:
Testing and Inspection/Symptom Related Diagnostic Procedures/Heating/Air Conditioning
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Before doing any symptom troubleshooting, check for powertrain DTCs.
1. Check the No. 20 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 36 (10 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 2.
NO - Replace the fuses and recheck. If the fuses blow again, check for a short in the No. 20 (7.5 A) and No. 36 (10 A) fuses circuit.
2. Connect the HDS to the DLC.
3. Start the engine.
4. Turn on the A/C on the HVAC control unit.
5. Check the A/C CLUTCH in the PGM-FI Data List with the HDS,
Is the A/C CLUTCH on?
YES - Go to step 7.
NO - Go to step 6.
6. Check the engine coolant temperature and idle speed (use the HDS PGM-FI data list if possible).
Are the coolant temperature and idle speed OK?
YES - Go to step 7.
NO - Troubleshoot and repair the cause of the high engine coolant temperature, or low idle.
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 A/C compressor clutch relay 4P socket terminal No. 1 and body ground.
Is there battery voltage?
