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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. 12 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 30 (10 A) fuse in the under-dash fuse/relay box.

    Are the fuses OK? 

    YES  -Go to step 2.

    NO  -Replace the fuse(s) and recheck. If the fuse(s) blow again, check for a short in the No. 12 (7.5 A) and No. 30 (10 A) fuses circuit. ■

  2. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
  3. Start the engine.
  4. Turn on the A/C at 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).
    DATA LIST REFERENCE

    ECT Sensor 2 169-194°F (76-90°C)
    TP sensor A About 0.5 Vat idle
    RPM 680-780

    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. Refer to POWER RELAY TEST ).

    Is the relay OK? 

    YES  -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
    G05968417Courtesy 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
    G05968418Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the A/C compressor clutch click? 

    YES  -Go to step 10.

    NO  -Go to step  19.

  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
    G05968419Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 13.

    NO  -Repair open in the wire between the No. 30 (10 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay. If the wire is OK, replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ). ■

  13. Turn the ignition switch to LOCK (0).
  14. Reinstall the A/C compressor clutch relay.
  15. Jump the SCS line with the HDS.
    NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
  16. Disconnect PCM connector A (49P).
  17. Connect PCM connector A (49P) terminal No. 13 to body ground with a jumper wire.
    Fig 4: Connecting PCM Connector A (49P) Terminal No. 13 To Body Ground With Jumper Wire
    G05968420Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Turn the ignition switch to ON (II).

    Does the A/C compressor click? 

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

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

  19. Disconnect the jumper wire.
  20. Disconnect the A/C compressor clutch 1P connector.
  21. 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 2 And A/C Compressor Clutch
    G05968421Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

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

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

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