3.2.388. SPN 521022, FMI 31, Possible exhaust line temperature sensor interchange

Description

The exhaust temperature sensors may be cross-connected.

Possible causes are:

• The exhaust temperature sensors are cross-connected.
• One of the exhaust temperature sensors is disconnected.
• One of the exhaust temperature sensors is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault.

NOTE: The present fault is classified as an emission related fault. Engine power will be reduced after a certain time which is defined by an authority.

Solution

• Check that the exhaust temperature sensors are connected correctly.
• Check that the SCR catalyst inlet temperature sensors are not cross-connected.
• Check the exhaust temperature sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
• Check that each of the exhaust temperature sensors are effective. Change defective sensors to new sensors.