4.2.12. SPN 102, FMI 4, Boost pressure sensor voltage below normalΒΆ

Description

The measured boost pressure signal is below the normal operating range (< 0,29 V).

Possible causes are:

  • The boost pressure sensor wiring is defective. (Shorted to ground.)
  • The boost pressure sensor power supply is not correct.
  • The boost pressure 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 functions dependent on the boost pressure are not active. No recovery before system reset.

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 boost pressure sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the 5 V power supply to the sensor.
  • Check the operation with another boost pressure sensor to see if the boost pressure sensor is defective.

See Boost pressure and temperature sensor sensor for reference.