Signal from coolant temperature sender -G2-, checking
If there is a malfunction in the coolant temperature display at the instrument cluster, check for the signal at the instrument cluster.
- Connect VAS5051 tester or VAG1551 scan tool. See VAS 5051 VEHICLE DIAGNOSTIC, MEASURING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS .
- Read memory. See READ MEASURING VALUE BLOCK (SCAN TOOL FUNCTION 08) .
- Select display group 003.
- If the temperature is displayed in the diagnostic unit V.A.G 1551 but not in the instrument cluster, the instrument cluster is defect and must be replaced.
- If no coolant temperature is displayed in the diagnostics unit V.A.G 1551 , check for the signal at the multi plug connector at the instrument cluster.
- Instrument cluster removal. See INSTRUMENT CLUSTER, REMOVING AND INSTALLING .
- Connect the test box V.A.G 1598 with the adapter V.A.G 1598/25 to the 32-pin connector.
- Use the multi meter V.A.G 1526 between terminal 8 and terminal 7 (sensor ground) and measure the resistance.
Base value:
- Coolant temperature 90 °C: approx. 110 Ohm
- Coolant temperature 120 °C: approx. 50 Ohm
If the base value is not achieved, check the harness connectors to the sender for the coolant temperature -G2-.
- Check wire connection according to wiring diagram.
See appropriate System Wiring Diagram article.
If the wire connections are ok, replace coolant temperature sensor -G2-.