2.2.26. SPN 110, FMI 0, Coolant temperature sensor: Temperature HIGH, ALARM.ΒΆ

Description

The measured coolant temperature exceeds the overheating alarm limit.

Possible causes are:

  • The fan belt is slipping, or the belt is broken.
  • The cooling system is not completely filled.
  • The water pump is defective.
  • The cooling system is clogged.
  • The thermostat is defective or removed (a double acting thermostat).
  • The thermostat is upside down.
  • The radiator filler cap is not pressure tight.
  • The engine is overloaded.
  • The coolant temperature sensor wiring is defective.
  • The coolant temperature sensor is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The engine stops after 30 seconds. The CAN message indicates that a shutdown is pending.

Solution

First save the error log and then do the procedure that follows:

  • Examine the fan belt and the belt tension.
  • Examine the coolant level.
  • Examine the condition of the radiator.
  • Examine the mechanical condition of the engine.
  • Examine the coolant temperature sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Test the operation with another coolant temperature sensor to see if the temperature sensor is defective.

See Coolant temperature sensor for reference.