Vacuum Pump: Testing and Inspection

Cruise Control Vacuum System, Checking For Leaks

Follow the sequence of operations below:
- Remove vacuum line from vacuum pump.
- Push diaphragm on actuator inward.
- Plug removed vacuum line.
- If actuator diaphragm remains pressed and does not move: system is airtight
- If actuator diaphragm returns to its original position: system has a leak


NOTE: Malfunctions can be caused by incorrectly set vent valves, leaking actuators or by cracks in the vacuum lines.