Compression Check: Testing and Inspection
Engine Compression InspectionNOTE: After this inspection, you must select powertrain control module (PCM) reset using the Honda PGM Tester or Honda Diagnostic System (HDS) otherwise 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. Disconnect the throttle actuator control module connector, and the MAP sensor connector from the throttle body, then remove the mounting hardware. Do not disconnect any hoses.
6. Slide the throttle body away from the intake manifold, and set it aside.
7. Connect the Honda PGM Tester or the HDS to the data link connector (DLC).
8. Select PGM-F1, select inspection, then select the ALL INJECTORS OFF function on the Honda PGM Tester or the HDS.
9. Attach the compression gauge to a spark plug hole.
10. Crank the engine with the starter motor and measure the compression.
Compression Pressure: Above 990 kPa (10.1 kgf/cm2, 145 psi)
11. Perform the same measurement on the remaining cylinders.
Maximum Variation: Within 200 kPa (2.0 kgf/cm2, 28 psi)
12. 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 bore.
13. Perform the PCM reset procedure.
14. Reinstall the throttle body with a new gasket.
15. Perform the PCM idle learn procedure.