Aftertreatment DPF Regeneration 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.

WARNING: Exhaust system components can become hot enough during operation and testing to cause burns or ignite and melt combustible materials. The exhaust and exhaust components can remain hot after the vehicle stops moving and has been shut down. To avoid the risk of fire, property damage, burns or other serious personal injury, allow the exhaust system to cool before beginning repairs or service. Make sure that no combustible materials are located where they are likely to come in contact with hot exhaust or exhaust components.

NOTE: If the stationary regeneration is being performed to recover either the DOC or DPF, or both, after coolant contamination, the DOC does not need to be removed or inspected unless there are active faults that require inspection as part of the fault code troubleshooting steps.

Before performing stationary regeneration, follow the steps listed below:

Select an appropriate location to park the vehicle.
- On a surface that will not burn or melt under high temperatures (such as clean concrete or gravel, not grass or asphalt)
- Away from anything that can burn, melt, or explode
  - Nothing within 0.6 m (2 ft) of the exhaust outlet
  - Nothing that can burn, melt, or explode within 1.5 m (5 ft) (such as gasoline, wood, paper, plastics, fabric, compressed gas containers, and hydraulic lines)
Park the vehicle securely.
- Set the parking brake.
- Place the transmission in P (Park).
- Set the wheel chocks at the front and rear of at least one tire.
Set up a safe exhaust area.
- If bystanders can possibly enter the area, use barriers to keep people at least 1.5 m (5 ft) from the exhaust outlet during regeneration.
- When indoors, attach an exhaust discharge pipe rated for at least 800°C (1, 500°F).
- Keep a fire extinguisher nearby.
Check exhaust system surfaces.
- Confirm that nothing is on or near the exhaust system surfaces (such as tools, rags, grease, or debris).
Prepare for engine speed changes during regeneration.
- Stay clear of the engine compartment.
Begin the stationary regeneration.
- CONSULT electronic service tool can be used to perform regeneration by starting the DPF Regeneration Test.
- The engine will create enough heat to regenerate the DPF. Engine speed will increase and the turbocharger can whistle loudly during the regeneration process. Once the DPF is regenerated, the engine will automatically return to normal idle speed.
- Make sure that the vehicle and surrounding area is monitored during regeneration. If any unsafe condition occurs, shut the engine off immediately.
Monitor the area.
- Make sure that the vehicle and surrounding area is monitored during regeneration. If any unsafe condition occurs, shut the engine OFF immediately.

To stop a stationary regeneration, engage the brake, or throttle pedal; or turn off the engine.

Once regeneration is complete, exhaust gas and exhaust surface temperatures will remain elevated for 3 to 5 minutes.

The test can be found under the ECM Diagnostics Test menu in CONSULT electronic service tool. Follow the on-screen instructions to perform the test.
To stop the stationary regeneration test at any time during the test:
- Select the stop button on CONSULT electronic service tool monitor screen.
- Depress the brake.
- Depress the accelerator pedal.
- Turn the engine off.
During the Aftertreatment DPF Regeneration Test, the following will be monitored:
- Aftertreatment DPF Soot Load: Informs the user of the current soot load of the filter:
  - Normal: No regeneration is necessary.
  - Above Normal: Least Severe Level - A stationary regeneration can be performed.
  - Above Normal: Moderately Severe Level - A stationary regeneration can be performed.
  - Above Normal: Most Severe Level - Reset the soot load using CONSULT. Perform a stationary regeneration. If soot load increases back to the most severe level, then replace the DOC/DPF.
- DPF Outlet Temperature
- DPF Inlet Temperature
- Diesel Oxidation Catalyst Inlet Temperature
Before starting the Aftertreatment DPF Regeneration Test, inspect the exhaust piping for leaks, cracks, and loose connections. Refer to Checking Exhaust System .
Tighten the exhaust clamps (if necessary). Refer to Exploded View . Any leaks in the exhaust system will cause the Aftertreatment DPF Test to be less efficient in reducing the soot load of the filter. This will result in the test running longer and possibly not completing.

NOTE: If the Aftertreatment DPF Regeneration Test will not initiate, see the Stationary Regeneration - Will Not Activate troubleshooting symptom tree. Refer to DTC Description .

- Once the Aftertreatment DPF Regeneration Test is started, follow CONSULT electronic service tool on-screen instructions. When the test is started, the engine idle speed will be raised automatically to the required level.
- The engine will, through engine controls, operate in a manner to build exhaust heat. The turbocharger will emit a slight whining noise during this test. This is normal.
- Once the Aftertreatment DPF Regeneration Test is complete, the engine will automatically return to normal idle speed.
Once the test is complete, check for active fault codes and/or engine indicator lamps for high diesel particulate soot load after performing the Aftertreatment DPF Regeneration Test. If any active P-codes are present, follow the appropriate P-code troubleshooting tree.