Air Regulator Solenoid
- Check operation of air regulator with engine cold. Start engine and note if idle speed is higher than normal after initial start. If idle speed is not higher, proceed to step 4).
- As engine temperature increases, engine idle speed should stabilize. Check air regulator for leakage. Disconnect hose between air regulator and throttle valve body at throttle valve body side. Plug throttle body fitting end. See Fig 1
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Courtesy of ISUZU MOTOR CO.
- Start engine. Check for variation in engine speed by closing and opening end of air regulator hose. Variation in engine speed should be less than 50 RPM. Replace air regulator if variation in engine speed is more than specification.
- If fast idle speed was not higher than normal on initial engine start, disconnect air regulator harness connector at air regulator. Air regulator is located on right rear of engine, below intake manifold.
- Using ohmmeter, measure resistance between air regulator terminals. Resistance should be 45.5-49.5 ohms. Replace air regulator if resistance is not as specified. If resistance is as specified, go to next step.
- Turn ignition on. Using a voltmeter, check for voltage at air regulator harness connector. If voltage is present, replace air regulator. If voltage is not present, check wiring to air regulator and fuel pump relay.