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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.
  • If the blower motor does not run at all speeds, the A/C compressor will be inoperative. Run the self-diagnostic function, and check the DTC B1241. Before performing any other troubleshooting, repair the cause of the inoperative blower motor.
  • 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 PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Check the No. 20 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 16 (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 f use(s) and recheck. If the f use(s) blow again, check for a short in the No. 20 (7.5 A) fuse and the No. 16 (7.5 A) fuse circuits.

  2. Connect the HDS to the DLC.
  3. Check for these PGM-FI DTCs: P0117, P0118, P0506, P0507, P0532, and P0533.

    Are any of these DTCs indicated? 

    YES  -Go to the appropriate troubleshooting section.

    NO  -Go to step 4.

  4. Start the engine.
  5. Turn on the A/C.
  6. Check the A/C CLUTCH in the PGM-FI Data List with the HDS.

    Is the A/C CLUTCH on? 

    YES  -Go to step  8.

    NO  -Go to step 7.

  7. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
    A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING CHART

    TP SENSOR A About 0.5 V
    RPM A/T 750-850
    M/T 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 (2-32 kgf/cm2 ) [28-455 psi]

    Are all the values within specifications? 

    YES  -Go to step 8.

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

  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
    G07770666Courtesy 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 Using Jumper Wire
    G07770667Courtesy 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).
  13. 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
    G07770668Courtesy 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. If the wire is OK, replace the under-hood fuse/relay box.

  14. Turn the ignition switch to LOCK (0).
  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. 15 to body ground with a jumper wire.
    Fig 4: Connecting ECM/PCM Connector A (49P) Terminal No. 15 To Body Ground Using Jumper Wire
    G07770669Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. 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 (49P). 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.

  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. 3.
    Fig 5: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket Terminal No. 2 And A/C Compressor Clutch 3P Connector Terminal No. 3
    G07770670Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

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