A6 Sedan V6-2.8L (AHA) (1998)
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Check indication in display field -1-.
If the coolant temperature is indicated, instrument cluster is malfunctioning.
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Replace instrument cluster.
If the Engine Coolant Temperature (ECT) is not indicated:
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Check signal at multi-pin harness connector at instrument cluster.
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Remove instrument cluster.
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Connect VAG1598A test box to blue 32-pin multi-pin harness connector using VAG1598/25 adapter.
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Connect multimeter between terminal 8 and 7 (sensor Ground (GND)) for resistance measurement.
Engine coolant temperature in °C
Resistance in ohm
90
approx. 110
120
approx. 50
If specified values are not obtained:
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Check wire connection between instrument cluster and Engine Coolant Temperature (ECT) sensor according to wiring diagram.
If no malfunctions are found in wire:
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Replace coolant temperature sensor.