2004 Acura RSX Base, AutomaticFACTORY OEM SERVICE PROCEDURE

2002-2004 models

  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 And E16
    G03651006Courtesy 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 the full lock position.
  5. Measure voltage between ECM/PCM connector terminals A24 and E16.
    Fig 2: Measuring Voltage Between ECM/PCM Connector Terminals A24 And E16
    G03651007Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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 3: Connecting PSP Switch 2P Connector Terminals No 1 And No 2 With A Jumper Wire
    G03651008Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Measure voltage between ECM/PCM connector terminals A24 and E16.
    Fig 4: Measuring Voltage Between ECM/PCM Connector Terminals A24 And E16
    G03651009Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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 (E16) and the PSP switch, or an open in wire between the PSP switch and G451.
  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 5: Measuring Voltage Between ECM/PCM Connector Terminals A24 And E16
    G03651010Courtesy 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 E (31P).
  17. Check for continuity between body ground and ECM/PCM connector terminal E16.
    Fig 6: Checking Continuity Between Body Ground And ECM/PCM Connector Terminal E16
    G03651011Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between ECM/PCM (E16) and the PSP switch.
    2. NO -  Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see HOW TO UPDATE 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 ).
Factory Service Tools

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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.