Compression Check

Engine Compression Test
No cylinder should read less than 690 kPa (100 psi).

Cylinder Deactivation (Active Fuel Management) System Compression Test
Depress the Schrader valve on the compression gage, in order to release the pressure and zero the gage. With the engine running and the cylinder in active fuel management mode, the compression reading should be less than 172 kPa (25 psi)