Compression Check: Testing and Inspection
Engine Compression InspectionNOTE: After this inspection, you must reset the powertrain control module (PCM), using the Honda Diagnostic System (HDS) otherwise the PCM continues to stop the fuel injectors.
1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Remove the six ignition coils.
4. Remove the six spark plugs.
5. Connect the HDS to the data link connector (DLC).
6. Select PGM-FI INSPECTION, then ALL INJECTORS OFF function on the HDS.
7. Attach the compression gauge to a spark plug hole.
8. Open the throttle fully, crank the engine with the starter motor and measure the compression.
Compression Pressure: Above 930 kPa (9.5 kgf/cm2, 135 psi)
9. Measure the compression on the remaining cylinders.
Maximum Variation: Within 200 kPa (2.0 kgf/cm2, 28 psi)
10. If the compression is not within specifications, check the following items, then remeasure the compression.
- Damaged or worn valves and seats
- Damaged cylinder head gasket
- Damaged or worn piston rings
- Damaged or worn piston and cylinder bare
11. Select PCM reset to cancel the ALL INJECTORS OFF function on the HDS.