Signal From Engine Coolant Temperature (ECT) Sensor -G2-, Check

Signal From Engine Coolant Temperature (ECT) Sensor -G2-, Checking

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.
- Connect VAS5051 tester or VAG1551 scan tool. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks" under "Lighting and Horns"
- Read Measuring Value Block. Refer to "Scan tool Testing/Measuring Value Blocks (Function 08)/Reading" under "Instrument Panel"
- Select display group number 003.

If the Engine Coolant Temperature (ECT) appears on the VAG1551 scan tool display but not by the Engine Coolant Temperature (ECT) gauge, the instrument cluster is faulty and must be replaced.

If no Engine Coolant Temperature (ECT) is indicated on the VAG1551 scan tool display, the signal must be checked at multi-function connection at instrument cluster.
- Remove instrument cluster.
- Connect VAG1598 tester with VAG1598/25 adapter to the blue 32-pin connector.
- Measure resistance (sensor resistance) between terminal 8 and 7 using VAG1526 multimeter.

Specified values:
Coolant temperature 90 °C: approx. 110 Ohms
Coolant temperature 120 °C: approx. 50 Ohms

If the specified values are not reached, the wire connection to Engine Coolant Temperature (ECT) -G2- must be checked.
- Check wire connection according to wiring diagram.

If the wire connection is OK, Engine Coolant Temperature (ECT) -G2- must be replaced.