Overheat sensor
â–¶ How to fix
Check the overheating sensor. Measurement points 11 and 17 in the auxiliary heater control unit connector. Resistance value: 150 kOhm at -25 °C10 kOhm at +25 °C. Check the water temperature sensor. Measurement points 14 and 18 in the connector to the auxiliary heater control unit. Resistance value: 650 kOhm at -25 °C 1000 kOhm at +25 °C.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Temperature at the overheating sensor rises too quickly.
Possible cause
The difference in temperature between the overheat sensor and water temperature sensor is too big.