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A/C Pressure Switch Circuit Troubleshooting

NOTE: Do not use this troubleshooting procedure if any of the following items are operative; A/C condenser fan, radiator fan, A/C compressor. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
  1. Disconnect the A/C compressor clutch 3P connector.
  2. Turn the ignition switch to ON (II).
  3. Measure the voltage between the A/C compressor clutch 3P connector terminal No. 3 and body ground.
    Fig 1: Measuring Voltage Between A/C Compressor Clutch 3P Connector Terminal No. 3 And Body Ground
    G05456482Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  - Go to step  4.

    NO  - Check for loose or poor connections at the ECM/PCM, or repair open in the BLU/WHT wire between the A/C compressor and the ECM/PCM connector E (31P). If the wire is OK, substitute a known-good ECM/PCM, and recheck. If the symptom goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

  4. Turn the ignition switch to LOCK (0).
  5. Test the A/C compressor thermal protector (see A/C COMPRESSOR CLUTCH CHECK ).

    Is the A/C compressor thermal protector OK? 

    YES  - Go to step  6.

    NO  - Replace the A/C compressor thermal protector (see A/C COMPRESSOR THERMAL PROTECTOR REPLACEMENT ).

  6. Reconnect the A/C compressor clutch 3P connector.
  7. Disconnect the A/C pressure switch 2P connector.
  8. Turn the ignition switch to ON (II).
  9. Measure the voltage between the No. 2 terminal of the A/C pressure switch 2P connector and body ground.
    Fig 2: Measuring Voltage Between No. 2 Terminal Of A/C Pressure Switch 2P Connector And Body Ground
    G05456483Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  - Go to step  10.

    NO  - Repair open in the WHT/BLU wire between the A/C pressure switch and the thermal protector.

  10. Turn the ignition switch to LOCK (0).
  11. Check for continuity between the No. 1 and No. 2 terminals of the A/C pressure switch.
    Fig 3: Checking Continuity Between No. 1 And No. 2 Terminals Of A/C Pressure Switch
    G05456484Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  12.

    NO  - Go to step  34.

  12. Reconnect the A/C pressure switch 2P connector.
  13. Disconnect the A/C switch 13P connector.
  14. Turn the ignition switch to ON (II).
  15. Measure the voltage between the No. 8 terminal of the A/C switch 13P connector and body ground.
    Fig 4: Measuring Voltage Between No. 8 Terminal Of A/C Switch 13P Connector And Body Ground
    G05456485Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  - Go to step  16.

    NO  - Repair open in the wire between the A/C pressure switch and the A/C switch.

  16. Turn the ignition switch to LOCK (0).
  17. Test the A/C switch (see A/C SWITCH TEST/REPLACEMENT ).

    Is the A/C switch OK? 

    YES  - Go to step  18.

    NO  - Replace the A/C switch.

  18. Disconnect the mode control switch 4P connector.
  19. Turn the ignition switch to ON (II).
  20. Measure the voltage between the No. 3 terminal of the mode control switch 4P connector and body ground.
    Fig 5: Measuring Voltage Between No. 3 Terminal Of Mode Control Switch 4P Connector And Body Ground
    G05456486Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  - Go to step  21.

    NO  - Repair open in the wire between the A/C pressure switch and the mode control switch.

  21. Turn the ignition switch to LOCK (0).
  22. Test the mode control switch (see MODE CONTROL SWITCH TEST ).

    Is the mode control switch OK? 

    YES  - Go to step  23.

    NO  - Replace the heater-A/C control panel (see HEATER-A/C CONTROL PANEL REMOVAL/INSTALLATION ).

  23. Disconnect the heater fan switch 7P connector.
  24. Check for continuity between the No. 7 terminal of the A/C switch 13P connector and the No. 6 terminal of the heater fan switch 7P connector.
    Fig 6: Checking Continuity Between A/C Switch 13P Connector And Heater Fan Switch 7P Connector Terminals
    G05456487Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  25.

    NO  - Repair open in the wire between the A/C switch and the heater fan switch.

  25. Check for continuity between the No. 4 terminal of the mode control switch 4P connector and No. 6 terminal of the heater fan switch 7P connector.
    Fig 7: Checking Continuity Between Mode Control Switch 4P Connector And Heater Fan Switch 7P Connector Terminals
    G05456488Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  26.

    NO  - Repair open in the wire between the mode control switch and the heater fan switch.

  26. Test the heater fan switch (see HEATER FAN SWITCH TEST ).

    Is the heater fan switch OK? 

    YES  - Go to step  27.

    NO  - Replace the heater fan switch.

  27. Check for continuity between the No. 3 terminal of the heater fan switch 7P connector and body ground.
    Fig 8: Checking Continuity Between No. 3 Terminal Of Heater Fan Switch 7P Connector And Body Ground
    G05456489Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  28.

    NO  - Check for an open in the wire between the heater fan switch and body ground. If the wire is OK, check for poor ground at G403 (see GROUND TO COMPONENTS INDEX ).

  28. Disconnect the evaporator temperature sensor 2P connector.
  29. Measure the resistance between the No. 1 and No. 2 terminals of the evaporator temperature sensor.
    Fig 9: Measuring Resistance Between No. 1 And No. 2 Terminals Of Evaporator Temperature Sensor
    G05456490Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the resistance within the specifications shown on the graph? 

    YES  - Go to step  30.

    NO  - Replace the evaporator temperature sensor.

  30. Jump the SCS line with the HDS.
  31. Disconnect ECM/PCM connector E (31P).
  32. Check for continuity between the following terminals of ECM/PCM connector E (31P) and the evaporator temperature sensor 2P connector.
    E (31P) 2P
    No. 4 No. 2
    No. 6 No. 1
    Fig 10: Checking Continuity Between ECM/PCM And Evaporator Temperature Sensor Connector Terminals
    G05456491Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  33.

    NO  - Repair open in the wires between the ECM/PCM and the evaporator temperature sensor.

  33. Check for continuity between the No. 6 terminal of ECM/PCM connector E (31P) and body ground.
    Fig 11: Checking Continuity Between No. 6 Terminal Of ECM/PCM Connector E (31P) And Body Ground
    G05456492Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to body ground in the wire between the ECM/PCM and the evaporator temperature sensor.

    NO  - Check for loose wires or poor connections at ECM/PCM connector E (31P), the evaporator temperature sensor 2P connector, the A/C pressure switch 2P connector, the A/C switch 13P connector, mode control switch 4P connector and at the heater fan switch 7P connector. If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

  34. Check for proper A/C system pressure (see PRESSURE TEST ).

    Is the pressure within specifications? 

    YES  - Replace the A/C pressure switch.

    NO  - Repair the A/C pressure problem.

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