Overheating
Check the water circulation. Check the check valve in the coolant circuit. Check water hoses and connections. Check that there is no air in the cooling system. Check the thermostat. Check the water valve. Check the water pump. Measuring points 3 and 6 in the connector for the auxiliary heater control unit. Resistance value: 4 ohms Check the overheat sensor. Measuring points 11 and 17 in the connector for the auxiliary heater control unit Resistance value: 150 kohm at -25 °C 10 kohm at +25 °C Check the dosage pump. Measuring points 1 and 2 on dosage pump V41. Resistance: 20 ohms Check the fuel supply.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The overheat sensor has detected a temperature of more than 115°C.
Poor water circulation or fault in overheating sensor.