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Home >> Honda >> 2003 >> Civic Hybrid, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Idle Control System (Hybrid) >> Idle Stop Switch Signal Circuit Troubleshooting >> CVT Model

CVT Model

  1. Check the idle stop switch adjustment (see ADJUSTMENTS ).

    Is the adjustment OK? 

    • YES  - Go to step 2.
    • NO  - Adjust the idle stop switch (see ADJUSTMENTS ).

  2. Turn the ignition switch ON (II).
  3. Press the brake pedal.
  4. Measure voltage between ECM connector terminal E25 and body ground.
    Fig 1: Measuring Voltage Between ECM Connector Terminal E25 & Body Ground
    G01460337Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 5.
    2. NO  - Go to step 7.

  5. Release the brake pedal.
  6. Measure voltage between ECM connector terminal E25 and body ground.
    Fig 2: Measuring Voltage Between ECM Connector Terminal E25 & Body Ground
    G01460338Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is voltage less than 1.0 V? 

    1. YES  - The idle stop switch signal is OK.
    2. NO  - Go to step 15.

  7. Turn the ignition switch OFF.
  8. Disconnect the idle stop switch 2P connector.
  9. Turn the ignition switch ON (II).
  10. Measure voltage between ECM connector terminal E25 and body ground.
    Fig 3: Measuring Voltage Between ECM Connector Terminal E25 & Body Ground
    G01460339Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Replace the idle stop switch.
    2. NO  - Go to step 11.

  11. Turn the ignition switch OFF.
  12. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after the radiator fan stops.
  13. Disconnect ECM connector E (31P).
  14. Check for continuity between ECM connector terminal E25 and body ground.
    Fig 4: Checking Continuity Between ECM Connector Terminal E25 & Body Ground
    G01460340Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM (E25) and the idle stop switch.
    2. NO  - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck (see ECM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM, replace the original ECM (see HOW TO SUBSTITUTE OR REPLACE THE ECM ).

  15. Turn the ignition switch OFF.
  16. Disconnect the idle stop switch 2P connector.
  17. Check for continuity between idle stop switch 2P connector terminals No. 1 and No. 2.
    Fig 5: Checking Continuity Between Idle Stop Switch 2P Connector Terminals No. 1 & No. 2
    G01460341Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 18.
    2. NO  - Replace the idle stop switch.

  18. Turn the ignition switch ON (II).
  19. Measure voltage between idle stop switch 2P connector terminal No. 2 and body ground.
    Fig 6: Measuring Voltage Between Idle Stop Switch 2P Connector Terminal No. 2 & Body Ground
    G01460342Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    • YES  - Repair open in the wire between the idle stop switch and G501.
    • NO  - Repair open in the wire between the ECM (E25) and the idle stop switch.

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