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Home >> Audi >> 1994 >> 90 CS Quattro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Camshaft Position (CMP) Sensor
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Camshaft Position (CMP) Sensor

  1. Disconnect CMP sensor connector. See the ELECTRICAL COMPONENT LOCATIONS  table at beginning of article. Connect Test Box (VAG 1598) to ECM with Adapter Cable (VAG 1598/11). Connect LED Tester (1115) between test box terminals No. 8 and 46. Operate starter for several seconds.
  2. If LED flashes at each second engine revolution, go to next step. If LED does not flash at each second engine revolution, check for faulty wiring. If wiring is okay, go to next step.
  3. Turn ignition on. Check voltage between test box terminals No. 7 and 45. If 9 volts minimum is not present, replace ECM. If 9 volts minimum is present, check voltage between test box terminals No. 8 and 45. If 4 volts minimum is not present, replace ECM. If 4 volts minimum is present, replace CMP sensor.
NOTE: Closed throttle position switch (idle switch) is part of throttle position sensor.
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