TT Quattro Coupe V6-3.2L (BHE) (2005)
Temperature Sensor (Gauge): Testing and Inspection
Engine Coolant Temperature (ECT) Sensor -G2-, Checking
If the coolant temperature gauge in the instrument cluster is not working properly, check whether the coolant temperature sensor signal is being received
by the instrument cluster.
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Connect scan tool.
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Select "Read Measuring Value Block" function 08.
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Select Display Group 003.
If the coolant temperature is indicated on scan tool, instrument cluster is malfunctioning and must be replaced.
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Removing instrument cluster.
If the coolant temperature is not indicated on scan tool, test the signal at the multi-pin connector on the instrument cluster.
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Removing instrument cluster.
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Connect test box VAG 1598 to the blue 32-pin connector using adapter VAG 1598/25.
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Use multimeter to measure resistance between contacts 8 and 9 (load Ground).
Specifications:
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Coolant temperature 90 degrees C: approx. 110 Ohms
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Coolant temperature 120 degrees C: approx. 50 Ohms
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If measured values do not match specifications, test wiring between instrument cluster and coolant temperature sender using wiring diagram.
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If there are no open circuits or short circuits, replace the coolant temperature sender.