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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 pressure.
  • Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
  • Before doing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Check the No. 12 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box.

    Are the fuses OK? 

    YES  -Go to step 2.

    NO  -Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 12 (7.5 A) and No. 30 (7.5 A) fuses circuit.

  2. Connect the HDS to the DLC.
  3. Start the engine.
  4. Turn on the A/C.
  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. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
    PGM-FI DATA LIST

    ECT SENSOR 2 169-194°F (76-90°C)
    TP SENSOR A About 0.5 V
    RPM 630-730
    A/C PRESSURE SENSOR 196-3,138 kPa (2-32 kgf/cm3 ) [28-455 psi]

    Are all the values within specifications? 

    YES  -Go to step 7.

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

  7. 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  -With the A/C compressor clutch relay disconnected, go to step 8.

    NO  -Replace the A/C compressor clutch relay.

  8. 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
    G07354719Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 9.

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

  9. 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
    G07354720Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the A/C compressor clutch click? 

    YES  -Go to step 10.

    NO  -Go to step  20.

  10. Disconnect the jumper wire.
  11. Turn the ignition switch to ON (II).
  12. Measure the voltage between A/C compressor clutch relay 4P socket terminal No. 4 and body ground.
    Fig 3: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket Terminal No. 4 And Body Ground
    G07354721Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 13.

    NO  -Repair an open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box and the A/C compressor clutch relay.

  13. Turn the ignition switch to LOCK (0).
  14. Reinstall the A/C compressor clutch relay.
  15. Turn the ignition switch to ON (II).
  16. Make sure the A/C switch is OFF.
  17. Measure the voltage between driver's under-dash fuse/relay box connector D (17P) terminal No. 5 and body ground.
    Fig 4: Measuring Voltage Between Driver's Under-Dash Fuse/Relay Box Connector D (17P) Terminal No. 5 And Body Ground
    G07354722Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 18.

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

  18. Measure the voltage between driver's under-dash fuse/relay box connector X (39P) terminal No. 9 and body ground.
    Fig 5: Measuring Voltage Between Driver's Under-Dash Fuse/Relay Box Connector X (39P) Terminal No. 9 And Body Ground
    G07354723Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 19.

    NO  -Replace the driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION ).

  19. Using the backprobe set, measure the voltage between PCM connector A (49) terminal No. 13 and body ground with the PCM connectors connected.
    Fig 6: Measuring Voltage Between PCM Connector (49) Terminal No. 13 And Body Ground
    G07354724Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

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

    NO  -Repair an open in the wire between the driver's under-dash fuse/relay box and the PCM.

  20. Disconnect the jumper wire.
  21. Disconnect the A/C compressor clutch 3P connector.
  22. Check for continuity between A/C compressor clutch relay 4P socket terminal No. 2 and A/C compressor clutch 3P connector terminal No. 1.
    Fig 7: Checking Continuity Between Relay 4P Socket Terminal No. 2 And A/C Compressor Clutch 3P Connector Terminal No. 1
    G07354725Courtesy 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 OVERHAUL  ). 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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