2.2.246. SPN 4753, FMI 4, DOC inlet temp sensor: Electrical signal below normal, possible reason is short to ground.ΒΆ

Description

The measured DOC inlet temp. signal is below the normal operating range.

Possible causes are:

  • The DOC inlet temperature sensor wiring is defective.
  • The DOC inlet temperature 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 which is defined by an authority.

Solution

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

  • Examine the DOC inlet temperature sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Measure the DOC inlet temperature sensor resistance value at a known temperature.
  • Try the operation with another DOC inlet temperature sensor to see if the sensor is defective.

See Exhaust gas temperature sensor for reference.