Test sequence
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If a malfunction of the Engine Coolant Temperature (ECT) gauge is detected at the instrument cluster, check if the signal at the instrument cluster is OK.
- Read measuring value block display group 003.
- Check indication in display field -1-.
If the coolant temperature is indicated, instrument cluster is malfunctioning.
- Replace instrument cluster. See INSTRUMENT CLUSTER, REMOVING AND INSTALLING .
If the Engine Coolant Temperature (ECT) is not indicated:
- Check signal at multi-pin harness connector at instrument cluster.
- Remove instrument cluster. See INSTRUMENT CLUSTER, REMOVING AND INSTALLING .
- Connect VAG 1598A test box to blue 32-pin multi-pin harness connector using VAG 1598/25 adapter.
- Connect multimeter between terminal 8 and 7 (sensor Ground (GND)) for resistance measurement.
ENGINE COOLANT TEMPERATURE RESISTANCE SPECIFICATION
| Engine coolant temperature in °C | Resistance in ohm |
|---|---|
| 90 | approx. 110 |
| 120 | approx. 50 |
If specified values are not obtained:
- Check wire connection between instrument cluster and Engine Coolant Temperature (ECT) sensor according to wiring diagram.
If no malfunctions are found in wire:
- Replace coolant temperature sensor.