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'01 Model

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Honda Odyssey, 2003 Honda Odyssey, 2002 Honda Odyssey, 2001 Honda Odyssey, and 2000 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
  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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