Air in DEF 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.
- Remove the DEF supply line (1) from the DEF dosing valve.
(A)
: DEF dosing valve harness connector
CAUTION: To avoid damage, do not kink or bend tubing or lines. Ensure all tubes and lines are routed and installed properly and care is given during the disassembly and assembly process. Failure to do so can result in damage to the tubes, lines or surrounding components.NOTE: Obtain a container suitable for collection of the DEF that exits the DEF supply line. A 3.8 L (1 US gal, 7/8 Imp gal) bucket is recommended. - Route the outlet of the DEF supply line into a suitable container.
- Turn the keyswitch to the ON position and connect CONSULT and select the Diesel Exhaust Fluid Doser Pump Override test under the ECM Diagnostic Tests menu.NOTE:
- This test will attempt to prime the dosing system. During this test, DEF will be drawn from the tank and pumped through the DEF supply line.
- Once the test is initiated, it will continue to pump DEF, even when attempting to stop the test with CONSULT. To stop the test, it is necessary to turn the keyswitch to the OFF position.
- If this test runs for an extended period of time, a P-code will become active. Limit the test time to 5 minutes or less.
- Observe the DEF flow exiting the DEF supply line while the Override Test is running.NOTE: Bubbles are an indication of a leak that allows air to enter the dosing system. If bubbles are present, check the following components for damage or leaks:
- DEF tank fitting
- DEF tank supply line
- DEF tank assembly
Repair or replace any damaged components.
- Turn the keyswitch to the OFF position to end the test.
- Connect DEF supply line.
- Dispose of the collected DEF in accordance with local environmental regulations.
- Operate the engine and check for leaks.