Particulate Filter Service Regeneration

Description A service regeneration of the Particulate filter is required during certain diagnostic procedures. When commanded, the engine control module (ECM) controls the service regeneration as follows:

1. The exhaust system is warmed up for about 8 minutes. Engine speed is slowly increased to 2,000 RPM and then to 2,500 RPM.
2. Once the Particulate Filter reaches its calibrated regeneration temperature, the ECM maintains engine speed between 2,000–2,500 RPM for about 20 minutes until regeneration is complete, is cancelled by the technician, or is aborted due to abnormal conditions.
3. The ECM then slowly decreases engine speed to 1600 RPM, then to 800 RPM, and finally to normal idle speed over a 5 minute period. This is done to allow the Particulate Filter to cool down. The following conditions must be met in order to enable Particulate Filter Service Regeneration: DTC P2463 is the only active DTC. The battery voltage is greater than 10 V. The engine speed is between 500–2,700 RPM. The vehicle speed is 0. Exhaust gas temperature sensor 1 is between 20–500°C (68–932°F). Exhaust gas temperature sensors 3 is between 20–735°C (68–1,355°F). The engine coolant temperature sensor is warmer than 70°C (158°F). The fuel temperature is colder than 150°C (302°F). The Barometric pressure is greater than 40 kPa (5.8 psi) The Accelerator Pedal Position sensor is less than 1 percent. The diesel exhaust fluid temperature is warmer than −7°C ( +19°F). The diesel exhaust fluid tank is not empty. The brake pedal and accelerator pedal are in the released position. The transmission is in Park. The Particulate Filter Service Regeneration will be terminated if any of the following conditions occur: The Particulate Filter Service Regeneration is commanded Off using the scan tool. The scan tool is disconnected from the vehicle. The vehicle is shifted out or Park. The brake or accelerator pedal is applied. Diagnostic Aids The scan tool Particulate Filter Regeneration Inhibit reason parameter will display a reason for not enabling or aborting the Particulate Filter service regeneration. Refer to the reasons that are displayed and the corrective action for each reason. Service Regeneration Unsuccessful

Particulate Filter Regeneration Parameters	Unsuccessful Regeneration—Number of Completed Regenerations Did Not Increment By One	Corrective Action For An Unsuccessful Regeneration
DPF Service Regeneration Inhibit Reason	Accelerator Pedal Position— The Accelerator Pedal Position sensor indicated over 1 percent	Ensure the accelerator pedal was not applied during the service regeneration. ⇒ If the accelerator pedal was not applied, test the accelerator pedal position sensor.

	Particulate Filter Regeneration Parameters	Unsuccessful Regeneration—Number of Completed Regenerations Did Not Increment By One	Corrective Action For An Unsuccessful Regeneration
		Brake Pedal Position Applied —The brake pedal position indicated Applied.	Ensure that the brake pedal was not applied during the service regeneration procedure. ⇒ If the brake pedal was not applied, test the brake pedal switch.
		Note: The scan tool must remain connected to the data communication link (DCL) during the entire service regeneration procedure. Device Control—The scan tool has interrupted service regeneration. A loss of communication between the scan tool and the vehicle has occurred.	The scan tool Exit or Off soft key button was depressed. Inspect for a poor connection at DCL.
		Particulate Filter Temperature —Particulate Filter service regeneration temperatures are less than a calibrated threshold.	Observe the DTC information. Test for a degraded diesel oxidation catalyst (DOC). Test for a skewed exhaust temperature sensor, Exhaust Gas Temperature sensor 2.
		Ignition and Start Switch Signal — Battery voltage was less than 11 V.	Test the battery and charging system for proper operation.
		None	Refer to the Particulate Filter Regeneration Status parameter
		Not in Park—Transmission gear selector is not in Park.	Ensure that the transmission gear selector remained in Park during the Service Regeneration procedure. ⇒ If the gear selector

Particulate Filter Regeneration Parameters	Unsuccessful Regeneration—Number of Completed Regenerations Did Not Increment By One	Corrective Action For An Unsuccessful Regeneration
		position, test the transmission range switch and circuits.
Particulate Filter Normal Regeneration Inhibit Reason	Regeneration Timed Out	A regeneration has timed out attempting a regeneration for greater than 90 minutes for this key cycle
	Exhaust Gas Temperature 2 High	Exhaust temperature sensor 2 greater than 750°C (1382°F)
	Exhaust Gas Temperature High	Exhaust temperature greater than 650°C (1202°F)
	DTC Set	An active DTC is set
	Axle Torque Limit	Torque Limiting is active to prevent an engine overheat condition
	Decel Too Long	A long decel condition of greater than 40 s was active
	Fuel Level	Fuel level is below 15%
	Turbocharger Temp Too High	Turbocharger temperature is too high
	TCM Override	A condition within the TCM is present
	Engine Run Time	Engine has not run long enough to complete a regeneration or has not warmed to operating temperature
	DLC Override	A scan tool is connected to the DLC
	Idle Speed Overide	Vehicle is shifted into Park or Neutral while a normal regeneration is active

Reference Information Description and Operation Exhaust Aftertreatment System Description DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References for scan tool information DPF Service Regeneration

Warning

Tailpipe outlet exhaust temperature will be greater than 300°C (572°F) during this procedure. To help prevent personal injury or property damage from fire or burns, perform the following:

1. Do not connect any shop exhaust removal hoses to the vehicle tailpipe.
2. Park the vehicle outdoors and keep people, other vehicles, and combustible material away during this procedure.
3. Do not leave the vehicle unattended.

Warning

To avoid extremely elevated exhaust temperatures, inspect and remove any debris or mud build up at the exhaust cooler located at the tailpipe.

Caution

Due to the elevated engine temperatures created while performing this procedure it is imperative to keep the front of vehicle in an open environment, with the hood open, away from any walls or buildings. This will ensure proper airflow across the radiator.

Note

If you were not referred to this procedure from another diagnostic, DO NOT perform the Service Regeneration. Do not refuel the vehicle during Particulate Filter Service Regeneration. The scan tool must remain connected to the data communication link (DCL) during the entire service regeneration procedure. Do not perform the Particulate Filter Service Regeneration if the diesel exhaust fluid temperature (DEF) is colder than −7°C (+19°F). Fuel level should be greater 15% to ensure a successful regeneration.

1. Ignition On.
2. Park the vehicle outside the repair facility and away from any obstacles.
3. With the vehicle in Park, use the throttle to increase the engine speed to 3000 RPM while looking for the speedometer to move slightly (greater than 1 mph). If this signal noise exists, inch the vehicle forward, place in park and repeat until there is no response seen from the speedometer. This will avoid a vehicle speed based interrupt of the service regeneration.
4. Place the transmission in Park and apply the parking brake.
5. Clear the DTCs with a scan tool before commanding a Particulate Filter Service Regeneration.
6. Observe the scan tool Particulate Filter Regenerations Completed parameter and record the value.
7. Open the hood.
8. Check the following fluid levels before and after this procedure: Reductant Engine oil Engine coolant Power steering Transmission  9. Perform the Ambient Air Temperature Reset with a scan tool if the vehicle has been driven in an outside temperature colder than −5°C (+23°F).

Note

If a scan tool message of Oil Temperature Out Of Range is displayed once a service regeneration is commanded, disregard the message and command the service regeneration procedure.

10. Command the Particulate Filter Service Regeneration On with a scan tool. ⇒ If the service regeneration failed to start, repair the vehicle for the condition indicated by the scan tool Particulate Filter Regeneration Inhibit Reason parameter. Refer to the Service Regeneration Unsuccessful table.
11. When the service regeneration is complete, the Particulate Filter Regeneration Status parameter will display Complete and the Particulate Filter Regenerations Completed parameter will increment by 1 from the value previously recorded. ⇒ If the service regeneration failed to start, repair the vehicle for the condition indicated by the scan tool Particulate Filter Regeneration Inhibit Reason parameter. Refer to the Service Regeneration Unsuccessful table.

Note

DTC P202E may set after a Particulate Filter Service Regeneration. The excessive exhaust temperatures created during a Particulate Filter Service Regeneration causes the diesel exhaust fluid (DEF) to crystallize. The crystallize reductant will cause the Q61  Emission Reduction Fluid Injector to stick. Idling the engine for 15 minutes will cause the reductant to liquefy and un-stick the injector.

12. Allow the engine to cool by idling for an additional 15 minutes. Command the Reductant Injector On and Off several times with a scan tool.
13. Clear the DTCs with a scan tool.
14. Ignition Off for 90 s. Repair Instructions Perform the Diagnostic Repair Verification.