2003 Acura 1.7EL StandardFACTORY OEM SERVICE PROCEDURE

PSP Switch Signal Circuit Troubleshooting

  1. Turn the ignition switch ON (II).
  2. Measure voltage between ECM/PCM connector terminals A24 and E16.
    Fig 1: Measuring Voltage Between ECM/PCM Connector Terminals A24 & E16
    G01954857

    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 the full lock position.
  5. Measure voltage between ECM/PCM connector terminals A24 and E16.

    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 the PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 2: Connecting PSP Switch 2-Pin Connector Terminals No. 1 & No. 2
    G01954858
  10. Measure voltage between ECM/PCM connector terminals A24 and E16.

    Is there less than 1.0 V? 

    1. YES  - Replace the PSP switch.
    2. NO  - Check for these problems:
      • An open in the wire between the ECM/PCM (E16) and the PSP switch.
      • An open in wire between the PSP switch and G201.
  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 A24 and E16.
    Fig 3: Measuring Voltage Between ECM/PCM Connector Terminals A24 & E16
    G01954859

    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 E (31P).
  17. Check for continuity between body ground and ECM/PCM connector terminal E16.
    Fig 4: Checking Continuity Between Body Ground & ECM/PCM Connector Terminal E16
    G01954860

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM/PCM (E16) and the PSP switch.
    2. NO  - Reprogram the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see ECM/PCM REPROGRAMMING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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