Electrical Vacuum Control Valve
- Electrical vacuum control valve may be either open or closed at room temperature, but should reverse position when engine is at normal operating temperature. While engine is cold, check for continuity across switch terminals. See Fig 1. Note if switch is open or closed.
- Warm engine to normal operating temperature. Check for continuity across switch terminals again. Continuity should be opposite of cold condition. If continuity does not switch, replace valve. Check vacuum function of valve. See VACUUM CONTROL VALVE (VCV) test.