See Figures 1 and 2
The IACV-air regulator is used on CA16DE, CA18DE, GA16DE and SR20DE engines to provide increased idle speed during cold engine operation. The valve contains bimetal spring, that is connected to a rotary shutter. The shutter opens, when the engine is cold, allowing additional air to bypass the throttle plates, thus increasing the engine speed. During warm-up, an electrical current supplied to the valve, heats the bimetal spring, closing off the port.
See Figures 3 and 4
- Turn the ignition switch to the OFF position.
- Disconnect the IACV-air regulator electrical connector.
- Connect a voltmeter between terminal A and a known good engine ground.
Turn the ignition switch
. Battery voltage should be present.
If battery voltage is present, proceed to the next step.
- Turn the ignition switch OFF .
Connect an ohmmeter from terminal
to a known good engine ground. Continuity should exist.
If continuity is present, proceed to the next step.
- Connect an ohmmeter across the IACV-air regulator terminals.
- Measure the resistance between the terminals. The resistance should be approximately 70-80 ohms. If resistance is not within specifications, replace the IAC control valve
- Visually inspect the rotary shutter for clogging, sticking or binding. Clean shutter or replace the valve assembly if necessary.