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Home >> Honda >> 2002 >> Accord Value Package >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mount Control System (4-CYL) >> Troubleshooting

Engine Mount Control System (4-CYL): Troubleshooting

Special Tools Required 

  1. Vacuum Pump/Gauge, 0-30 in.Hg A973X-041-XXXXX
NOTE: Check the vacuum hoses and lines for damage and proper connections before troubleshooting.

Follow this procedure if the engine vibrates excessively when idling.

  1. Warm up the engine to normal operating temperature (the cooling fan comes on twice).

    Is the idle speed less than 800 RPM? 

    1. YES  - Go to step 2.
    2. NO  - Adjust the idle speed (see IDLE SPEED ADJUSTMENT ).
  2. Fully depress the brake pedal.
  3. With the transmission in gear, have an assistant disconnect and reconnect the 2P connector from the engine mount control solenoid valve.

    Is there a noticeable change in idle smoothness when the 2P connector is disconnected? 

    1. YES  - Reconnect the 2P connector to the solenoid valve. The engine mount control system is OK.
    2. NO  - Go to step 4.
  4. Shift to [N  ] or [P  ] position.
  5. Disconnect the 2P connector from the engine mount control solenoid valve.
  6. Measure voltage between the No. 2 terminal and body ground.
    Fig 1: Measuring Voltage Between No. 2 Terminal & Body Ground
    G02556851Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 7.
    2. NO  - Repair open in BLK/YEL wire between the 2P connector and No. 6 (15 A) fuse in the driver's under-dash fuse/relay box.
  7. Measure voltage between the No. 1 and No. 2 terminals.
    Fig 2: Measuring Voltage Between No. 1 & No. 2 Terminals
    G02556852Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 8.
    2. NO  - Repair open in GRN/WHT wire between Powertrain Control Module (PCM) (A2) and the 2P connector. If the wire is OK, substitute a known-good Powertrain Control Module (PCM) and recheck (see HOW TO SUBSTITUTE THE ECM/PCM FOR TESTING PURPOSES ).
  8. Raise the engine speed above 1,000 RPM.
  9. Measure voltage between the No. 1 and No. 2 terminals.
    Fig 3: Measuring Voltage Between No. 1 & No. 2 Terminals
    G02556853Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Repair short to body ground in GRN/WHT wire between PCM (A2) and the 2P connector. If the wire is OK, substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE ECM/PCM FOR TESTING PURPOSES ).
    2. NO  - Go to step 10.
  10. Disconnect the upper vacuum hose (A) from the engine mount control solenoid valve (B), and connect a vacuum pump/gauge to the hose. Apply vacuum for 20 seconds.
    Fig 4: Connecting A Vacuum Pump/Gauge To Upper Vacuum Hose
    G02556854Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the engine mount hold vacuum? 

    1. YES  - Go to step 11.
    2. NO  - Either the vacuum hose or the engine mount has a vacuum leak. Repair as needed.
  11. Release the vacuum, then apply vacuum again.

    Is there a noticeable change in idle smoothness with and without vacuum applied? 

    1. YES  - Go to step 12.
    2. NO  - Replace the engine mount.
  12. Disconnect the lower vacuum hose (A) from the engine mount control solenoid valve (B) and connect a vacuum pump/gauge to the hose.
    Fig 5: Connecting A Vacuum Pump/Gauge To The Lower Vacuum Hose
    G02556855Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there manifold vacuum? 

    1. YES  - Replace the engine mount control solenoid valve.
    2. NO  - A hose is restricted or pinched or the intake manifold port is plugged. Repair as needed.
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