Idle Speed/Throttle Actuator - Mechanical: Testing and Inspection

SYSTEM INSPECTION
- Warm up engine to normal operating temperature.

Checking Throttle Opener Operation:

- Check that there is clearance between throttle stop screw and throttle lever at engine stop and cranking and that 0 - 1.0 second after engine start, throttle opener rod retracts and clearance disappears.
- If check result is not satisfactory, check vacuum hoses, throttle opener, VSV and system electric circuit.

VACUUM HOSES INSPECTION

Checking Vacuum Hoses:

- Check hoses for connection, leakage, clog and deterioration. Replace as necessary.

THROTTLE OPENER INSPECTION
- Disconnect vacuum hose from VSV.
- Connect vacuum pump gauge to hose disconnected.

Checking Throttle Opener:

- Check that opener rod moves smoothly and that it is held at the same position when 50 cmHg vacuum is applied to opener.
- If rod doesn't move smoothly, or it isn't held at the same position, replace.

VSV (VACUUM SWITCHING VALVE) INSPECTION
- With ignition switch OFF, disconnect connector from VSV.

Checking VSV Resistance:

- Check resistance between two terminals of VSV.

VSV RESISTANCE
39 ohms

- If resistance is as specified, proceed to next operation check. If not, replace.
- Disconnect vacuum hoses from throttle opener and intake manifold.

Checking VSV Operation:

- Blow into hose "A". Air should come out of hose "B" and not out of filter.

Checking VSV Operation:

- Connect 12V battery to VSV terminals. In this state, blow hose "A".
- Air should come out of filter and not out of hose "B".
- If check result is not as described above, replace VSV.
- Connect VSV connector securely.
- Connect vacuum hoses securely.