DEF System Leak Test: Test
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.
- Prior to running the test, check the following:
- Make sure the DEF tank is full of DEF.
- Make sure the DEF is not frozen. If the DEF is frozen, it will be necessary to run the engine to allow the system to thaw.
- Make sure the DEF supply line is properly connected to the DEF tank and the DEF dosing valve.
- Connect CONSULT.
NOTE: It may be necessary to allow the after treatment system time to cool to allow for accessibility to check for leaking components. - With the keyswitch ON and the engine OFF, select the Aftertreatment Diesel Exhaust Fluid System Leak Test found under the Engine Control Module (ECM) diagnostics test menu in CONSULT.NOTE:
- This test will cause the DEF dosing unit to draw DEF from the tank and pressurize it in the DEF dosing valve supply line. During this test, the dosing unit will continuously run and all unused DEF will return to the tank. An audible pumping noise will be noticeable during the test.
- During the initialization of this test, a note will appear on the screen, indicating that the system has reached a primed state.
- The dosing system should prime in under 1 minute for a system without leaks. If the dosing system does not prime, it may be due to a leak in the dosing valve or supply line.