Vacuum Control Valve

Functional Vacuum Check

1. With a cold engine, passage A to B should be closed and passage A to C should be open.

2. With engine at normal operating temperature, the VCV should be open between A and B and closed between A and C.

For the 4-port valve, check A1 to B1 and A2 to B2 separately.

3. If these conditions are not met, replace the VCV Valve.









Functional Electrical Check

1. While the engine is cold, measure the continuity across the switch. Compare with specifications.

2. Warm the engine to normal operating temperature.

3. Measure the continuity across the switch. Compare with specifications.

4. The vacuum function is checked as previously described.