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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, or hard acceleration.
  • 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 any symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Check the No. B10 (7.5 A) and the No. B43 (7.5 A) fuse in the under-dash fuse/relay box.

    Are the fuses OK? 

    YES  -Go to step  2.

    NO  -Replace the fuse, and recheck. If the fuses blow again, check for a short in the No. B10 (7.5 A) and No. B43 (7.5 A) fuse circuits.

  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  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 REFERENCE

    TP sensor About 0.5 V at idle
    RPM 700-800
    ECT SENSOR 2 176-212°F (80-100°C)
    A/C SWITCH ON
    A/C CLUTCH ON
    A/C PRESSURE SENSOR 196-3, 138 kPa (2.00-32.00 kgf/cm2 ) [28.4-455.1 psi]

    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).
  8. Remove the A/C compressor clutch relay from auxiliary under-hood relay box A, 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. 7 and body ground.
    Fig 1: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket Terminal No. 7 And Body Ground
    G06953681Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  10.

    NO  -Repair an open in the wire between the No. B43 (7.5 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay.

  10. Connect A/C compressor clutch relay 4P socket terminals No. 7 and No. 8 with a jumper wire.
    Fig 2: Connecting A/C Compressor Clutch Relay 4P Socket Terminals No. 7 And No. 8 With Jumper Wire
    G06953682Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the A/C compressor clutch click? 

    YES  -Go to step  11.

    NO  -Go to step  22.

  11. Disconnect the jumper wire.
  12. Turn the ignition switch to ON (II).
  13. Measure the voltage between A/C compressor clutch relay 4P socket terminal No. 16 and body ground.
    Fig 3: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket Terminal No. 16 And Body Ground
    G06953683Courtesy 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. B10 (7.5 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay.

  14. Turn the ignition switch to LOCK (0).
  15. Reinstall the A/C compressor clutch relay.
  16. Make sure the A/C switch is OFF.
  17. Jump the SCS line with the HDS.
    NOTE: This step must be done to protect the engine control module (ECM)/powertrain control module (PCM) from damage.
  18. Disconnect ECM/PCM connector A (44P).
  19. Measure the voltage between ECM/PCM connector A (44P) terminal No. 14 and body ground.
    Fig 4: Measuring Voltage Between ECM/PCM Connector A (44P) Terminal No. 14 And Body Ground
    G06953684Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 0.5 V or less? 

    YES  -Faulty A/C compressor clutch relay or short to power on the BLU wire. Repair the faulty part or repair the short, then replace the ECM/PCM (see ECM/PCM REPLACEMENT ).

    NO  -Go to step  20.

  20. Connect ECM/PCM connector A (44P) terminal No. 14 to body ground with a jumper wire.
    Fig 5: Connecting ECM/PCM Connector A (44P) Terminal No. 14 To Body Ground With Jumper Wire
    G06953685Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Turn the ignition switch to ON (II).

    Does the A/C compressor click? 

    YES  -Check for loose wires or poor connections at ECM/PCM connector A (44P). If the connections 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.

  22. Disconnect the jumper wire.
  23. Disconnect the A/C compressor clutch 3P connector.
  24. Check for continuity between A/C compressor clutch relay 4P socket terminal No. 8 and A/C compressor clutch 3P connector terminal No. 2.
    Fig 6: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket Terminal No. 8 And A/C Compressor Clutch 3P Connector Terminal No. 2
    G06953686Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check the A/C compressor clutch clearance, the thermal protector circuit, and the A/C compressor clutch field coil.

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

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