2.2.7. SPN 102, FMI 10, Boost pressure sensor: Pressure drop too high at cranking.ΒΆ

Description

The measured boost pressure is below the warning limit during engine cranking.

Possible causes are:

  • The engine air supply is clogged.
  • 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. The CAN message indicates an active fault.

NOTE: The engine may not start, or it starts slowly and runs poorly.

Solution

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

  • Examine the engine air supply system completely, consult the workshop service manual if necessary.
  • Make sure that the air filter is clean and installed in correctly.
  • Examine the piping from the air filter to the turbocharger (look for obstacles in the joints, the bends).
  • Make sure that the turbocharger operation is correct.
  • Examine the piping from the turbocharger to the charge air cooler (look for obstacles in the joints, the bends).
  • Make sure that the charge air cooler is not damaged.
  • Examine the piping from the charge air cooler to the inlet manifold (look for obstacles in the joints, the bends).
  • Examine the boost pressure sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Try the operation with another boost pressure sensor to see if the boost pressure sensor is defective.

See Boost pressure and temperature sensor for reference.