After Treatment Connected

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.

Monitoring the condition of the exhaust leaving the exhaust system outlet during a Snap Acceleration Test can reveal the condition of the after treatment diesel particulate filter (DPF).

NOTE: The engine must be at minimum operating temperature or above when completing this test

Place vehicle transmission in N (Neutral) and apply the parking brake.
Start and idle the engine.
Rapidly depress the accelerator pedal from 0-100%. This can be performed multiple times, if necessary.
Check for black smoke exiting the exhaust stack as the engine is accelerated from low idle to high idle.
NOTE: In some applications, a Snap Acceleration Test may not provide the conditions necessary to reveal a malfunctioning after treatment DPF. If there is a heavy buildup of exhaust residue/soot on the exhaust system outlet and a Snap Acceleration Test does not reveal a condition outlined in the following steps, it may be necessary to perform a brief acceleration run under partial to full load.
- White smoke can indicate condensation in the exhaust and/or some unburned fuel. White smoke is not an indication of a malfunction of the after treatment system.
- Visible gray smoke or faint black smoke out of the exhaust system outlet indicates that the after treatment DPF is damaged. Inspect the after treatment DPF.
- Visible black smoke out of the exhaust system outlet indicates a malfunction of the after treatment DPF.