Compression Check: Testing and Inspection

Engine Compression Inspection

NOTE: After the inspection, you must reset the powertrain control module (PCM). Otherwise, the PCM will continue to stop the fuel injectors from operating.

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

2. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

3. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) Initial Inspection and Diagnostic Overview.

4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

5. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit Testing and Inspection.

6. Select ALL INJECTORS STOP in the PGM-FI INSPECTION menu with the HDS.

7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

8. Remove the six ignition coils Service and Repair.

9. Remove the six spark plugs.

10. Attach the compression gauge to a spark plug hole.






11. Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression.





12. Measure the compression on the remaining cylinders.





13. If the compression is not within specifications, check the following items, then remeasure the compression.

- Incorrect valve clearance
- Confirmation of cam timing
- Damaged or worn cam lobes
- Damaged or worn valves and seats
- Damaged cylinder head gaskets
- 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 six spark plugs.

16. Install the six ignition coils Service and Repair.

17. Select PCM reset Initial Inspection and Diagnostic Overview in the PGM-FI INSPECTION menu to cancel ALL INJECTORS STOP with the HDS.