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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; condenser fan, radiator fan, A/C compressor, or if the heater is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
  • Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Disconnect the A/C pressure switch 2P connector.
  2. Turn the ignition switch ON (II).
  3. Measure the voltage between the No. 2 terminal of the A/C pressure switch 2P connector and body ground.
    Fig 1: Measuring Voltage Between No. 2 Terminal Of A/C Pressure Switch 2P Connector And Body Ground
    G04547949Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 4.

    NO  - Go to step  12.

  4. Turn the ignition switch OFF.
  5. Check for continuity between the No. 1 and No. 2 terminals of the A/C pressure switch.
    Fig 2: Checking Continuity Between No. 1 And No. 2 Terminals Of A/C Pressure Switch
    G04547950Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 6.

    NO  - Go to step  15.

  6. Reconnect the A/C pressure switch 2P connector.
  7. Disconnect the heater control panel 30P connector.
  8. Turn the ignition switch ON (II).
  9. Measure the voltage between the No. 23 terminal of the heater control panel 30P connector and body ground.
    Fig 3: Measuring Voltage Between No. 23 Terminal Of Heater Control Panel 30P Connector And Body Ground
    G04547951Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 10.

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

  10. Turn the ignition switch OFF.
  11. Measure the resistance between the No. 3 and No. 4 terminals of the heater control panel 30P connector.
    Fig 4: Measuring Resistance Between No. 3 And No. 4 Terminals Of Heater Control Panel 30P Connector
    G04547952Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the resistance less than 24 kΩ? 

    YES  - Check for loose wires or poor connections at the heater control panel 30P connector and at the A/C pressure switch 2P connector. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.

    NO  - Repair cause of high resistance in the evaporator temperature circuits.

  12. Turn the ignition switch OFF.
  13. Disconnect the PCM connector A (44P).
  14. Check for continuity between the No. 41 terminal of PCM connector A (44P) and No. 2 terminal of the A/C pressure switch 2P connector.
    Fig 5: Checking Continuity Between No. 41 Terminal Of PCM Connector A (44P) And No. 2 Terminal Of A/C Pressure Switch 2P Connector
    G04547953Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Check for loose wires or poor connections at the PCM connector A (44P). If the connections are good, substitute a known-good PCM, and recheck. If the symptom/indication goes away, replace the original PCM, then perform the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

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

  15. Check for proper A/C system pressure (see A/C SYSTEM TEST  ).

    Is the pressure within specifications? 

    YES  - Replace the A/C pressure switch.

    NO  - Repair the A/C pressure problem.

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