A/C Idle Control Solenoid Valve

Fig. 20 Idle Control System Wiring And Vacuum Hose Diagram:

Idle Boost Throttle Controller Test

1. Start the engine and let it warm up to normal operating temperature (cooling fan comes on).
2. Check the idle speed with headlights, heater fan, rear window defogger, cooling fan, and air conditioner off.

Idle Speed Should Be:
Manual Trans. 800 +/-50 rpm
Auto Trans. 750 +/-50 rpm (except "N" or "P")

a. If OK, go to step 4
b. If not, go to step 3

3. Disconnect the vacuum hose from the idle boost throttle controller and check the vacuum.

Fig. 21 Idle Boost Throttle Controller:

a. There should be no vacuum.
b. If there is no vacuum, check the throttle valve shaft for binding or sticking and replace the idle boost throttle controller.
c. If there is vacuum, proceed to A/C Idle Boost Solenoid Test.

4. Check the idle speed with the A/C ON.

Idle Speed Should Be:
Manual Trans. 800 +/-50 rpm
Auto Trans. 750 +/-50 rpm (except "N" or "P")

a. If not, disconnect the vacuum hose from the idle boost throttle controller and check the vacuum.
b. There should be vacuum.
c. If there is vacuum, check the throttle valve shaft for binding or sticking and replace the idle boost throttle controller.
d. If there is no vacuum, proceed to A/C Idle Boost Solenoid Test

�rZ(Fig. 11 A/C Idle Boost Solenoid Valve Test:

A/C Idle Boost Solenoid Valve Test