4.2.48. SPN 1381, FMI 16, Fuel supply pump inlet pressure ABOVE NORMAL

Description

The measured fuel supply pump pressure is too high.

Possible causes are:

• The external fuel supply pump is defective. The external supply pump is used due to the long fuel line from the tank to the pre-filter.
• The fuel supply pump pressure sensor wiring is defective
• The fuel supply pump pressure sensor power supply is not correct
• The fuel supply pump 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 that depend on the fuel supply pump pressure 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:

• If external fuel supply pump is used check operation with another supply pump.
• Check the fuel supply pump pressure sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).(see Fuel supply pump inlet pressure sensor)
• Check the 5 V power supply to the sensor.(see Fuel supply pump inlet pressure sensor)
• Check the operation with another pressure sensor to see if the fuel filter pressure sensor is defective.(see Fuel supply pump inlet pressure sensor)