Compression Check: Testing and Inspection
Engine Compression InspectionNOTE: On the 2005-2006 models: After this inspection, you must reset the engine control module (ECM)/powertrain control module (PCM), otherwise ECM/PCM will continue to stop the injectors from functioning. Select ECM/PCM reset using the Honda Diagnostic System (HDS).
1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. 2002-2004 models: Remove the No. 17 (15 A) fuse from the under-dash fuse/relay box.
2005-2006 models: Connect the HDS to the data link connector (DLC). Turn the ignition switch ON (II), then select PGM-FI, INSPECTION, then ALL INJECTORS OFF function on the HDS.
4. Remove the four ignition coils.
5. Remove the four spark plugs.
6. Attach the compression gauge to the spark plug hole.
7. Open the throttle fully, then crank the engine with the starter motor and measure the compression.
Compression Pressure: Above 930 kPa (9.5 kgf/cm2, 135 psi)
8. Measure the compression on the remaining cylinders.
Maximum Variation: Within 200 kPa (2.0 kgf/cm2, 28 psi)
9. 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
10. Remove the compression gauge from the spark plug hole.
11. Install the four spark plugs.
12. Install the four ignition coils.
13. 2002-2004 models: Install the No. 17 (15 A) fuse from the under-dash fuse/relay box.
2005-2006 models: Select ECM/PCM reset to stop the ALL INJECTORS OFF function on the HDS.