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Home >> Honda >> 2001 >> Accord Value Package >> Repair and Diagnosis >> Engine Performance >> System >> Idle Control System (4-CYL) >> PSP Switch Signal Circuit Troubleshooting
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PSP Switch Signal Circuit Troubleshooting

  1. Turn the ignition switch ON (II).
  2. Measure voltage between ECM/PCM connector terminals A26 and B20.
    Fig 1: Measuring Voltage Between ECM/PCM Connector Terminals A26 & B20
    G02557380Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there less than 1.0 V? 

    1. YES  - Go to step 3.
    2. NO  - Go to step  6.
  3. Start the engine.
  4. Turn the steering wheel to full lock position.
  5. Measure voltage between ECM/PCM connector terminals A26 and B20.

    Is there battery voltage? 

    1. YES  - The PSP switch signal is OK.
    2. NO  - Go to step  11.
  6. Turn the ignition switch OFF.
  7. Disconnect the PSP switch 2P connector.
  8. Turn the ignition switch ON (II).
  9. At the harness side, connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 2: Connecting PSP Switch 2P Connector Terminals No. 1 & No. 2 With Jumper Wire
    G02557381Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Measure voltage between ECM/PCM connector terminals A26 and B20.

    Is there less than 1.0 V? 

    1. YES  - Replace the PSP switch.
    2. NO  - Check for an open in the wire between the ECM/PCM (A26) and the PSP switch, or an open in wire between the PSP switch and G302.
  11. Turn the ignition switch OFF.
  12. Disconnect the PSP switch 2P connector.
  13. Turn the ignition switch ON (II).
  14. Measure voltage between ECM/PCM connector terminals A26 and B20.
    Fig 3: Measuring Voltage Between ECM/PCM Connector Terminals A26 & B20
    G02557382Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Replace the PSP switch.
    2. NO  - Go to step 15.
  15. Turn the ignition switch OFF.
  16. Disconnect ECM/PCM connector A (32P).
  17. Check for continuity between body ground and ECM/PCM connector terminal A26.
    Fig 4: Checking Continuity Between Body Ground & ECM/PCM Connector Terminal A26
    G02557383Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM/PCM (A26) and the PSP switch.
    2. NO  - Substitute a known-good ECM/PCM and recheck (see HOW TO SUBSTITUTE THE ECM/PCM FOR TESTING PURPOSES ). If the prescribed voltage is now available, replace the original ECM/PCM.
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