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A/C Compressor Clutch Circuit Troubleshooting

NOTE:
  • It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine coolant temperature, hard acceleration, or high/low refrigerant pressure.
  • Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the symptom troubleshooting.
  • Before doing any symptom troubleshooting, check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Check the No. 20 (7.5 A) fuse in the under-hood fuse/relay box.

    Is the fuse OK? 

    YES  - Go to step 2.

    NO  - Replace the fuse, and recheck. If the fuse blow again, check for a short in the No. 20 (7.5 A) fuse circuit.

  2. Connect the HDS to the DLC.
  3. Start the engine.
  4. Turn on the A/C.
  5. Check the A/C switch in the PGM-FI Data List with the HDS.

    Is the A/C switch ON? 

    YES  - Go to step 6.

    NO  - Go to A/C Signal Circuit Troubleshooting (see A/C SIGNAL CIRCUIT TROUBLESHOOTING ).

  6. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
    TP SENSOR About 0.5 V
    ENGINE IDLE J35Z6 engine: 630-730 RPM
    J37A4 engine (M/T): 700-800 RPM
    J37A4 engine (A/T): 650-750 RPM
    ECT SENSOR 2 176-212°F (80-100 °C)
    A/C SWITCH ON
    A/C CLUTCH ON

    Are all the values within specifications? 

    YES  - Go to step 7.

    NO  - Troubleshoot the value that is not within the specifications.

  7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  8. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

    Is the relay OK? 

    YES  - Go to step 9.

    NO  - Replace the A/C compressor clutch relay.

  9. Measure the voltage between A/C compressor clutch relay 4P socket terminal No. 1 and body ground.
    Fig 1: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket Terminal No. 1 And Body Ground
    G08071055Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 10.

    NO  - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

  10. Connect A/C compressor clutch relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
    Fig 2: Connecting A/C Compressor Clutch Relay 4P Socket Terminals No. 1 And No. 2 With Jumper Wire
    G08071056Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the A/C compressor clutch click? 

    YES  - Go to step 11.

    NO  - Go to step  20.

  11. Disconnect the jumper wire.
  12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  13. Measure the voltage between A/C compressor clutch relay 4P socket terminal No. 3 and body ground.
    Fig 3: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket Terminal No. 3 And Body Ground
    G08071057Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 14.

    NO  - Repair an open in the wire between the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and the A/C compressor clutch relay.

  14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  15. Reinstall the A/C compressor clutch relay.
  16. Jump the SCS line with the HDS.
    NOTE: This step must be done to protect the ECM/PCM from damage.
  17. Disconnect ECM/PCM connector A (49P).
  18. Connect ECM/PCM connector A (49P) terminal No. 13 to body ground with a jumper wire.
    Fig 4: Connecting ECM/PCM Connector A (49P) Terminal No. 13 To Body Ground With Jumper Wire
    G08071058Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

    Does the A/C compressor clutch click? 

    YES  - Check for loose wires or poor connections at ECM/PCM connector A (49P). If the connections are good, check the ECM/PCM grounds. If the grounds are good, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the symptom/indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

    NO  - Repair an open in the wire between the A/C compressor clutch relay and the ECM/PCM.

  20. Disconnect the jumper wire.
  21. Disconnect the A/C compressor clutch 1P connector.
  22. Check for continuity between A/C compressor clutch relay 4P socket terminal No. 2 and A/C compressor clutch 1P connector terminal No. 1.
    Fig 5: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket Terminal No. 2 And A/C Compressor Clutch 1P Connector
    G08071059Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Check the A/C compressor clutch clearance, and the A/C compressor clutch field coil (see A/C COMPRESSOR CLUTCH CHECK  ). Repair as needed.

    NO  - Repair an open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.

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