LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2011 >> Pilot EX, 3.5 3 >> Repair and Diagnosis >> Engine Performance >> System >> Idle Control System >> PSP Switch Signal Circuit Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 its 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 to LOCK (0).
  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 PUMP PRESSURE TEST WITH T/N 07406-0010001 ). ■

    NO  - Go to step  10.

  10. Turn the ignition switch to LOCK (0).
  11. Jump the SCS line with the HDS.
  12. Disconnect PCM connector A (49P).
  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 PCM (A38) and the PSP switch. ■

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

    Fig 1: Checking Continuity Between PSP Switch 2P Connector Terminal No. 1 & Body Ground
    G05961372Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Turn the ignition switch to LOCK (0).
  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 & No. 2 With Jumper Wire
    G05961373Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Check the PSP SWITCH in the DATA LIST with the HDS.

    Does it change to ON? 

    YES  - Replace the PSP switch (see PUMP PRESSURE TEST WITH T/N 07406-0010001 ). ■

    NO  - Go to step  18.

  18. Turn the ignition switch to LOCK (0).
  19. Remove the jumper wire from the PSP switch 2P connector.
  20. Jump the SCS line with the HDS.
  21. Disconnect PCM connector A (49P).
  22. Check for continuity between PCM connector terminal A38 and PSP switch 2P connector terminal No. 1.

    Is there continuity? 

    YES  - Go to step  23.

    NO  - Repair open in the wire between the PSP switch and the PCM (A38). ■

    Fig 3: Checking Continuity Between PCM Connector Terminal A38 & PSP Switch 2P Connector Terminal No. 1
    G05961374Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.

    Is there continuity? 

    YES  - Update the PCM if it does hot have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ). ■

    NO  - Repair open in the wire between the PSP switch and G202. ■

    Fig 4: Checking Continuity Between PSP Switch 2P Connector Terminal No. 2 & Body Ground
    G05961375Courtesy of AMERICAN HONDA MOTOR CO., INC.
scientia non olet · About LEMON Manuals