4.2.9. SPN 102, FMI 18, Boost pressure LOWΒΆ

Description

The measured boost pressure drops below the alarm level during operation.

Possible causes are:

  • The boost air piping is leaking.
  • The turbocharger is defective.
  • The engine is mechanically defective.
  • The boost pressure sensor wiring is defective.
  • 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 2). The CAN message indicates active fault.

Solution

Find the cause for the low boost pressure indication:

  • Check the boost air system tightness (the piping, the intercooler).
  • Check the condition of the turbo charger.
  • Check the mechanical condition of the engine.

To check the electrical defects, check the boost pressure sensor, the sensor wiring and the controller input: 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 operation with another boost pressure sensor to see if the boost pressure sensor is defective.

See Boost pressure and temperature sensor sensor for reference.