Idle Up Control Valve: Testing and Inspection

INSPECTION OF IDLE-UP SYSTEM

1. WARM UP ENGINE.
- Allow the engine to reach normal operating temperature.

2. CONNECT TACHOMETER.

3. INSPECT IDLE-UP SYSTEM.






a. Disconnect the Vacuum Switching Valve (VSV) connector for idle-up.






b. Turn the idle speed adjusting screw until the rpm falls to 500 rpm.






c. Connect the VSV connector.
d. Check that the rises above 100 rpm.
e. Adjust the idle speed.

4. INSPECT ISC VSV.






a. Inspect VSV for open circuit
- Using an ohmmeter, check that there is continuity between the terminals.

Resistance (Cold): 33 - 39 ohms

- If there is no continuity, replace the VSV.






b. Inspect VSV for ground.
- Using an ohmmeter, check that there is no continuity between each terminal and the body.
- If there is no continuity, replace the VSV.

c. Inspect VSV operation.






- Check that air does not flow from pipe E to pipe F.
- Apply battery voltage across the terminals.






- Check that air flows from pipe E to pipe F.
- If operation is not as specified, replace the VSV.