audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Coolant Temperature Sensor/Switch (For Computer)|Testing and Inspection|Page 601 > < Coolant Temperature Sensor/Switch (For Computer)|Testing and Inspection|Page 599
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Connect multimeter between terminals C and D of sensor to measure resistance.

Range A shows resistance values for temperature range 0 to 50 degrees C and range B shows the values for temperature range 50 to 100 degrees C.

Sample readings:

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30 degrees C corresponds to a resistance of 1500 to 2000 Ohms

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80 degrees C corresponds to a resistance of 275 to 375 Ohms

If specified value is not attained:

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Replace engine coolant temperature sensor.

If specified value is attained:

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Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module.  See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan
Tool/Wiring and Component Check With Test Box VAG 1598/31

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Check for open circuit and short to positive or ground in following wiring connections:

Connector

Test box VAG1598/31

terminal

Socket

3

108

4 (signal)

93

Coolant Temperature Sensor/Switch (For Computer)|Testing and Inspection|Page 601 > < Coolant Temperature Sensor/Switch (For Computer)|Testing and Inspection|Page 599