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Engine Compression Inspection

NOTE: After this inspection, you must reset the powertrain control module (PCM). Otherwise the PCM will continue to stop the injectors from functioning. Select PCM reset using the Honda Diagnostic System (HDS) (see HDS CLEAR COMMAND ).
  1. Warm up the engine to normal operating temperature (cooling fan comes on).
  2. Turn the ignition switch to LOCK (0).
  3. Connect the HDS to the data link connector (DLC) (see step 2 HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).
  4. Turn the ignition switch to ON (II).
  5. Make sure the HDS communicates with the vehicle and the PCM. If it done not, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
  6. Select PGM-FI, INSPECTION, then ALL INJECTORS STOP function on the HDS.
  7. Remove the four intake side ignition coils (see IGNITION COIL REPLACEMENT ).
  8. Remove the four intake side spark plugs.
  9. Attach the compression gauge to a spark plug hole.
    NOTE: Use a compression gauge with a connecting length (between the edge and the flange) of less than 23 mm (0.9 in).
    Fig 1: Attaching Compression Gauge To Spark Plug Hole
    G06428849
  10. Turn the battery module switch OFF (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
  11. Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor and measure the compression.

    Compression Pressure 

    Service Limit: 

    980 kPa (10.0 kgf/cm 2  , 142 psi) 

  12. Measure the compression on the remaining cylinders.

    Maximum Variation: 

    Within 200 kPa (2.0 kgf/cm 2  , 29 psi) 

  13. If the compression is not within specifications, check the following items, then remeasure the compression.
    • Incorrect valve clearance
    • Valve deposits
    • Confirmation of cam timing
    • Damaged or worn cam lobes
    • Looseness of exhaust side spark plug
    • Damaged or worn valves and seats
    • Damaged cylinder head gasket
    • Damaged or worn piston rings
    • Damaged or worn piston and cylinder bore
  14. Remove the compression gauge from the spark plug hole.
  15. Install the four intake side spark plugs (see IGNITION COIL REPLACEMENT ).
  16. Install the four intake side ignition coils (see IGNITION COIL REPLACEMENT ).
  17. Select PCM reset (see HDS CLEAR COMMAND ) to cancel the ALL INJECTORS OFF function on the HDS.
  18. Turn the battery module switch ON (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
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