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Home >> Audi >> 1990 >> 100 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Cis MOTRONIC >> Idle Switch
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Idle Switch

  1. Turn ignition on. Connect voltmeter between Test Adapter (VW 1501) connector 1 and ground. See Figure . Voltmeter should read battery voltage. Turn ignition off.
  2. Move throttle valve .20-.28" (.5-.7 mm). With feeler gauge between throttle valve stop and adjustment screw, measure resistance between test adapter connector 1 and ground using ohmmeter. Resistance should change from zero ohm (with throttle closed) to infinity as throttle gap increases beyond .020" (.5 mm).
  3. If resistance is not as specified, adjust idle gap to .006-.020" (.15-.5 mm). If resistance is as specified, check full throttle switch.
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