Engine Compression Inspection

Special Tools Required
Compression gauge attachment (  070AJ-RBD0100)

NOTE: After this inspection, you must reset the engine control module (ECM), otherwise the ECM will continue to stop the injectors from functioning. Select ECM 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.Connect the HDS to the data link connector (DLC).

4.ON the HDS select PGM-FI, INSPECTION, and then the ALL INJECTORS OFF.

5.Remove the four glow plugs.

6.Attach the compression gauge to the glow plug hole.


7.Crank the engine with the starter motor, and measure the compression.

Compression Pressure: 
Above 2.4 MPa (24.5 kgf/cm2, 348 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.Select ECM reset to cancel the ALL INJECTORS OFF function on the HDS.