General Information

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: To avoid possible damage to the Diesel Exhaust Fluid (DEF) system dosing valve, the following should be followed:

Care should be used when handling the DEF dosing valve as the spray nozzle is delicate and damage may occur.
Never set the dosing valve down on the spray nozzle.
Use caution when disconnecting the dosing valve connections.
Do not stress the dosing valve fluid connectors as they can be easily damaged.

The Diesel Exhaust Fluid (DEF) dosing valve (1) is used to spray DEF into the exhaust flow prior to the intake of the Selective Catalyst Reduction (SCR) catalyst (2). The DEF dosing valve is located on the decomposition tube (3), mounted on a flange with two bolts.

Courtesy of NISSAN NORTH AMERICA, INC.
There are two primary connections at the DEF dosing valve:
- A 2-pin harness connection, which connects the DEF dosing valve to the Engine Control Module (ECM)
- A DEF supply line, which connects the DEF dosing valve to the DEF dosing unit
Use the following procedure for further information on the operation of the DEF dosing valve. Refer to System Description .
Use the following procedure for information on handling incorrect or contaminated DEF. Refer to Exhaust Schematic .