Engine Compression Test

1. Warm up the engine to normal operating temperature.
2. Remove the fuel pump fuse (20A).
3. Wait until the engine stopped.
4. Remove the ignition coils and spark plugs.
5. Crank the engine to remove any foreign material in the cylinders.
6. Put a compression pressure gauge into spark plug hole.
7. Check compression pressure at each cylinder.

   Specification: 

   1225.83kPa (12.5kg/cm² , 177.79psi) (200 - 250 rpm)

   Limit: 1078.73kPa (11.0kg/cm² , 156.46psi)

   Difference between each cylinder: 98kPa (1.0kg/cm² , 14psi) or less

Good 

• Go to "Check Injector performance" procedure.

No Good 

• Add a small amount of oil through the spark plug hole, and repeat above steps. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
• If the compression on each cylinder is not the same or not similar a burnt or defective valve seat, worn head gasket and pressure rings can be the cause of vibration of engine.
• Repair or replace as necessary and go to "Verification of Repair " procedure.