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Home >> Audi >> 1989 >> 80 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests >> Engine Sensors & Switches >> Cis-E III >> Coolant Temperature Sensor
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Coolant Temperature Sensor

  1. Ensure engine temperature is greater than 176°F (20°C). Remove harness connector from coolant temperature sensor. Connect multimeter between temperature sensor terminal No. 1 and engine ground.
  2. Connect between terminal No. 2 and engine ground. For multimeter reading, see COOLANT TEMPERATURE SENSOR chart. Connect multimeter between harness connector terminal No. 1 and ground, then between terminal No. 2 and ground.
  3. Turn ignition on. Multimeter should read 4.5-5.5 volts. If no voltage is present, repair break in wiring. If no voltage is present and no break in wiring is found, replace respective control unit that controls that temperature sensor.
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