volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Coolant Temperature Sensor/Switch (For Computer) > < Overview of Component Locations|Page 1017
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If the specification is not attained:

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Check wiring between 2-pin connector contact 2 and fuse holder using current flow diagram.

If the specification is obtained:

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Connect test box V.A.G 1598/31 to control module wiring harness. Engine control module remains disconnected.

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Check wiring for open circuit between test box and 2-pin connector using wiring diagram.
Contact 3+socket 39 
Wire resistance: Max. 1.5 Ohm

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Additionally check wires for short to one another.

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Additionally check wiring for short to battery positive or Ground.

If no malfunction is detected in the wiring:

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Replace engine control module.

Coolant Temperature Sensor/Switch (For Computer) > < Overview of Component Locations|Page 1017