Golf III L4-2.0L (ABA) (1995)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Without VAG
Engine Coolant Temperature Sensor
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With the ignition "OFF", remove the harness connector from the Engine Coolant Temperature (ECT) Sensor.
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With a suitable volt/ohm meter, measure the resistance between terminals 1 and 3 of the Engine Coolant Temperature Sensor (terminals 1 & 3
correspond with BLUE wire and BROWN/YELLOW wire).
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Refer to the temperature sensor graph for the correct measurement.
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If the correct measurement IS NOT obtained, replace the Engine Coolant Temperature Sensor.
NOTE: Because of its adaptive capability, the Motronic control unit MUST be returned to its basic settings IF:
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The Engine Coolant Temperature Sensor has been disconnected while the engine is running.
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Any of these components have been replaced:
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Motronic control unit
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Mass Air Flow Sensor
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Throttle Position Sensor
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Throttle body
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Refer to: Return Motronic ECM to Basic Settings