4.2.38. SPN 110, FMI 3, Coolant temperature sensor voltage above normal or open circuitΒΆ

Description

The measured coolant temperature signal is above the normal operating range.

Possible causes are:

  • 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. Engine power will be reduced (Degradation Level 1). The CAN message indicates active fault. Engine protection and other functions that depend on the coolant temperature are not active.

NOTE: The engine overheating protection is not active. The engine may be damaged, if overheating happens.

Solution

First save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:

  • Check the coolant temperature sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the operation with another coolant temperature sensor to see if the temperature sensor is defective.

See Coolant temperature sensor sensor for reference.