Compression Check

Compression Check
The minimum compression in any 1 cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less than 690 kPa (100 psi). For example, if the highest pressure in any 1 cylinder is 1035 kPa (150 psi), the lowest allowable pressure for any other cylinder would be 725 kPa (105 psi). (1035 x 70% = 725) (150 x 70% = 105).

Cylinder Deactivation (Active Fuel Management) System Compression Test
With the engine running and the cylinder in active fuel management mode, the compression reading should be less than 172 kPa (25 psi).

Using the scan tool, de-energize the solenoid while observing the reading on the compression gage. With the engine running and the cylinder NOT in active fuel management mode, the compression gage reading should increase quickly to greater than 345 kPa (50 psi).