volkswagen Workshop Repair Guides

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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature Sensor, Checking

Diagnostic Procedures

Engine Coolant Temperature Sensor, Checking

‹› Use only gold-plated terminals when servicing terminals in harness  connector of sensor.

Special tools, testers and auxiliary items required

‹› Multimeter (VAG1526) or multimeter  (VAG1715)

‹› Connector test kit (VAG1594)

‹› Wiring diagram

Test requirements

‹› Fuses in E-box (in plenum chamber, left) must be OK: 

‹› Ground (GND) connections between engine and chassis must be OK.

‹› Parking brake must be engaged or else daylight driving lights will  be switched on.

‹› For vehicles with automatic transmission, selector lever must be in  P position.

‹› Engine must be cold.

Function test

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Connect diagnostic tester.

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Switch ignition on.

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Under address word 33, select "Diagnostic mode 1: Checking  measured values."

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Select the measuring value "PID 05: Coolant temperature". 

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Check specified value of coolant temperature:

If specified value is not obtained:

Engine, Cooling and Exhaust > Cooling System > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Testing and Inspection > Engine Coolant Temperature Sensor on Radiator, Checking > Page 2653

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