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Air Control Valve (ACV) Test

NOTE: The following test is for models with separate Idle Speed Control only. For models with integral fuel injection and idle speed control systems, see FUEL INJ - BOSCH LH article in the FUEL SYSTEMS section.
  1. Disconnect ACV harness connector. Measure resistance between terminals 3 and 4 and between terminals 4 and 5. Resistance should be about 20 ohms.
  2. Warm engine to operating temperature. Ground the Blue/White ACV test connector (located near the coil). ACV valve will close and engine speed should drop to about 600-650 RPM.
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