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PSP Switch Signal Circuit Troubleshooting

  1. Start the engine, and let it idle.
  2. Align the steering wheel straight ahead.
  3. Check the PSP SWITCH in the DATA LIST with the HDS.

    Does it indicate ON? 

    YES  - Go to step  4.

    NO  - Go to step  14.

  4. Turn the steering wheel to the full lock position.
  5. Check the PSP SWITCH in the DATA LIST with the HDS.

    Does it change to OFF? 

    YES  - The PSP switch signal circuit is OK.

    NO  - Go to step  6.

  6. Turn the ignition switch OFF.
  7. Disconnect the PSP switch 2P connector.
  8. Start the engine.
  9. Check the PSP SWITCH in the DATA LIST with the HDS.

    Does it change to OFF? 

    YES  - Replace the PSP switch (see POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT ).

    NO  - Go to step  10.

  10. Turn the ignition switch OFF.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector E (31P).
  13. Check for continuity between PSP switch 2P connector terminal No. 1 and body ground.

    Is there continuity? 

    YES  - Repair short in the wire between the ECM/PCM (E16) and the PSP switch.

    NO  - Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

    Fig 1: Checking Continuity Between PSP Switch 2P Connector Terminal No. 1 & Body Ground
    G05449199Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Turn the ignition switch OFF.
  15. Disconnect the PSP switch 2P connector.
  16. Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then start the engine.
    Fig 2: Connecting PSP Switch 2P Connector Terminals No. 1 & 2 With Jumper Wire
    G05449200Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Check the PSPSW in the DATA LIST with the HDS.

    Does it change to ON? 

    YES  - Replace the PSP switch (see POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT ).

    NO  - Go to step  1818.

  18. Turn the ignition switch OFF.
  19. Remove the jumper wire from the PSP switch 2P connector.
  20. Jump the SCS line with the HDS.
  21. Disconnect ECM/PCM connector E (31P).
  22. Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.
    Fig 3: Connecting PSP Switch 2P Connector Terminal No. 1 To Body Ground With Jumper Wire
    G05449201Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Check for continuity between body ground and ECM/PCM connector terminal E16.

    Is there continuity? 

    YES  - Go to step  24.

    NO  - Repair open in the wire between the PSP switch and the ECM/PCM (E16).

    Fig 4: Checking Continuity Between Body Ground & ECM/PCM Connector Terminal E16
    G05449202Courtesy of AMERICAN HONDA MOTOR CO., INC.
  24. Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.
    Fig 5: Checking Continuity Between PSP Switch 2P Connector Terminal No. 2 & Body Ground
    G05449203Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

    NO  - Repair open in the wire between the PSP switch and G301.

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