These valves are operated electrically by the ECU; when energized the valve opens a vacuum passage allowing engine vacuum to operate a component. The VSV is employed in several circuits; all are tested in basically the same fashion.
- Disconnect the negative battery terminal, remove the electrical connector from the valve and remove the valve.
- Test resistance between the valve terminals. Resistance should be approximately 30-35 ohms with the valve cold. If there is no continuity, the valve must be replaced. Check for continuity between either terminal and the VSV body. There should be no continuity.
- Using jumper wires, energize the valve by connecting to the proper terminals. Air should now pass out the B or F port when blowing air into the A or E port.
- With no power to the VSV, check that there is no air flow out of the B or F port when blowing into the A or E port. On valves with air filters, such as air control or T-vis, air may flow from the air filter when blowing into one port.
- If any portion of the test procedure is not as specified, the valve must be replaced.