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'01 Model

  1. Turn the ignition switch OFF.
  2. Disconnect the A/C pressure switch 4P connector.
  3. Turn the ignition switch ON (II).
  4. Measure voltage between PCM connector terminals A26 and E21.
    Fig 1: Measuring Voltage Between PCM Connector Terminals A26 & E21
    G01511670Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES:  Go to step 5.
    2. NO:  Go to step  12.
  5. Turn the ignition switch OFF.
  6. Reconnect the A/C pressure switch 4P connector.
  7. Turn the ignition switch ON (II).
  8. Momentarily connect PCM connector terminals A26 and E12 with a jumper wire several times.
    Fig 2: Momentarily Connecting PCM Connector Terminals A26 & E12 With A Jumper Wire Several Times
    G01511671Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there a clicking noise from the A/C compressor clutch? 

    1. YES:  Go to step 9.
    2. NO:  Go to step  15.
  9. Start the engine.
  10. Turn the blower switch ON.
  11. Turn the A/C switch ON.

    Does the A/C operate? 

    YES:  The air conditioning signal is OK.

    NO:  Go to step  16.

  12. Turn the ignition switch OFF.
  13. Disconnect PCM connector E (31P).
  14. Check for continuity between body ground and PCM connector terminal E21.
    Fig 3: Checking For Continuity Between Body Ground & PCM Connector Terminal E21
    G01511672Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Repair short in the wire between the PCM (E21) and the A/C pressure switch.
    2. NO:  Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE ) If the prescribed voltage is now available, replace the original PCM If not, check the A/C system for other symptoms.
  15. Momentarily connect under-hood fuse/relay box 16P connector terminal No. 11 to body ground with a jumper wire several times.
    NOTE: The under-hood fuse/relay box 16P connector is on the bottom of the fuse box. When you unbolt and invert the fuse box, leave the upper cover on to prevent short circuits.
    Fig 4: Momentarily Connecting Under-Hood Fuse/Relay Box 16P Connector Terminal No. 11 To Body Ground With A Jumper Wire Several Times
    G01511673Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there a clicking noise from the A/C compressor clutch? 

    1. YES:  Repair open in the wire between the PCM (E12) and the A/C clutch relay.
    2. NO:  Check the A/C system for other symptoms.
  16. Measure voltage between PCM connector terminals A26 and E21.
    Fig 5: Measuring Voltage Between PCM Connector Terminals A26 & E21
    G01511674Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there less than 10 V? 

    1. YES:  Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE ). If the symptom/indication goes away, replace the original PCM. If not, check the A/C system for other symptoms.
    2. NO:  Repair open in the wire between the PCM (E21) and the A/C pressure switch.
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