4.2.16. SPN 105, FMI 3, Intake air temp. sensor voltage above normal or open circuit

Description

The measured intake manifold air temperature signal is above the normal operating range (the sensor is integrated in the boost pressure sensor).

Possible causes are:

  • The intake manifold temperature sensor wiring is defective.
  • The intake manifold 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. The engine functions dependent on the intake manifold temperature are not active.

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

See Boost pressure and temperature sensor sensor for reference.