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Home >> Audi >> 1990 >> 100 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Cis MOTRONIC >> Coolant Temperature Sensor
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Coolant Temperature Sensor

  1. Ensure engine temperature is greater than 176°F (80°C). Remove harness connector from coolant temperature sensor. Connect voltmeter between temperature sensor terminal No. 1 and engine ground.
  2. Turn ignition on. Voltmeter should read 4.5-5.5 volts. If no voltage is present, repair break in wiring. If wiring is okay, replace CIS Motronic control unit.
NOTE: Full throttle switch terminal identifications are located on connector.
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