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Idle Stop Switch Signal Circuit Troubleshooting

  1. Check idle stop switch adjustment (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH/IDLE STOP SWITCH ADJUSTMENT ).

    Is the adjustment OK? 

    1. YES  - Go to step 2.
    2. NO  - Adjust the idle stop switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH/IDLE STOP SWITCH ADJUSTMENT ).
  2. Turn the ignition switch OFF.
  3. Jump the SCS line with the HDS.
  4. Disconnect PCM connector E (31P).
  5. Turn the ignition switch ON (II).
  6. Measure voltage between PCM connector terminal E9 and body ground.
    Fig 1: Measuring Voltage Between PCM Connector Terminal E9 And Body Ground
    G03663798Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 7.
    2. NO  - Go to step  9.
  7. Press the brake pedal.
  8. Measure voltage between PCM connector terminal E9 and body ground.
    Fig 2: Measuring Voltage Between PCM Connector Terminal E9 And Body Ground
    G03663799Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is voltage less than 1.0 V? 

    1. YES  - The idle stop switch signal circuit is OK.
    2. NO  - Replace the idle stop switch.
  9. Turn the ignition switch OFF.
  10. Disconnect the idle stop switch 2P connector.
  11. At idle stop switch side, check for continuity between idle stop switch 2P connectors No. 1 and No. 2
    Fig 3: Checking For Continuity Between Idle Stop Switch 2P Connectors No. 1 And No. 2
    G03663800Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 12.
    2. NO  - Replace the idle stop switch.
  12. Check the No. 18 ACG (15 A) fuse in under-dash fuse/relay box.

    Is the fuse blown? 

    1. YES  -
      • Repair short in the wire between the idle stop switch and the No. 18 ACG (15 A) fuse. Also replace the No. 18 ACG (15 A) fuse.
      • Repair short in the wire between the PCM (E9) and the idle brake switch. Also replace the No. 18 ACG (15 A) fuse.
    2. NO  - Go to step 13.
  13. Turn the ignition switch ON (II).
  14. Measure voltage between idle stop switch 2P connector terminal No. 1 and body ground.
    Fig 4: Measuring Voltage Between Idle Stop Switch 2P Connector Terminal No. 1 And Body Ground
    G03663801Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 15.
    2. NO  - Repair open in the wire between the idle stop switch and the No. 18 ACG (15A) fuse.
  15. Turn the ignition switch OFF.
  16. Check for continuity between PCM connector terminal E9 and idle stop switch 2P connector terminal No. 2.
    Fig 5: Checking For Continuity Between PCM Connector Terminal E9 And Idle Stop Switch 2P Connector Terminal No. 2
    G03663802Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see UPDATING THE PCM ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ).
    2. NO  - Repair open in the wire between the PCM (E9) and the idle stop switch.
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