2.2.87. SPN 1761, FMI 3, DEF tank level sensor: Electrical signal above normal, possible reason is open circuit.ΒΆ

Description

The measured diesel exhaust fluid (DEF) tank level signal is above the normal operating range.

Possible causes are:

  • The DEF tank level sensor wiring is defective (Shorted to high source or open circuit).
  • The DEF tank level 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 present fault is classified as an emission related fault. Engine power is reduced after a certain time defined by an authority.

Solution

First save the error log and then obey the solutions that follow:

  • Examine the DEF tank level sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).

NOTE: The DEF tank temp. and level sensors have a common reference GND.

  • Check the DEF tank level sensor operation. Measure the resistance over the level sensor. The resistance should be under 1MOhm.