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).

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).

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).

8. Remove the four intake side ignition coils. Service and Repair

9. Remove the four intake side spark plugs.

10. 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.).

11. Turn the IMA battery module switch OFF. High Voltage Safety

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

Compression Pressure:
Above 980 kPa (10.0 kgf/cm2, 142 psi)

13. Measure the compression on the remaining cylinders.

Maximum Variation:
Within 200 kPa (2.0 kgf/cm2, 28 psi)

14. 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

- Looseness 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

15. Remove the compression gauge from the spark plug hole.

16. Install the four intake side spark plugs.

17. Install the four intake side ignition coils. Service and Repair

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

19. Do the PCM idle learn procedure PCM Idle Learn Procedure.

20. Do the start clutch pressure control calibration procedures. Programming and Relearning

21. Turn the IMA battery module switch ON. High Voltage Safety

22. Clear any IMA DTCs that may have been set while doing this inspection procedure.

23. If the IMA battery level gauge (BAT) displays no segment, start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in N or P) until the BAT displays at least three segments.