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Tighten: Tighten the nuts to 95 N.m (70 lb ft). 17. Remove the support from the transmission. 18. Lower the vehicle. EXHAUST PARTICULATE FILTER CLEANING (LMM DPF REGENERATION ENABLE) DPF Regeneration Enable 1. Ignition ON, clear all DTCs with a scan tool. 2. Select DPF Regeneration Enable within the Special Function menu. 3. Select ON. The selection can be confirmed by the DPF Regeneration Reason parameter indicating 4. Exit the Special Function Menu. The scan tool can now be removed. The vehicle will perform an active Regeneration as soon as the engine running conditions are met. EXHAUST PARTICULATE FILTER CLEANING (LMM DPF SERVICE REGENERATION) IMPORTANT: The DPF Regeneration Enable is required when specific service procedures have been performed. Do not perform a DPF CAUTION: Tailpipe outlet exhaust temperature will be greater than 300°C (572°F) during service regeneration. To help preven t personal 1. Do not connect any shop exhaust removal hoses to the vehicle's tailpipe. 2. Park the vehicle outdoors and keep people, other vehicles, and combustible material away during service 3. Do not leave the vehicle unattended. CAUTION: To avoid extremely elevated exhaust temperatures, inspect
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Conditions for Running The following conditions must be met in order to enable DPF Service Regeneration: There are no active DTCs displayed. The battery voltage is greater than 10 volts. The engine speed is between 600-1,250 RPM. The exhaust gas temperature (EGT) sensors 1 and 2 are less than 400°C (752°F). The engine coolant temperature (ECT) sensor 1 is between 70-115°C (158-239°F). The brake pedal and accelerator pedal are in the released position. The transmission is in Park or Neutral. Test Procedure 1. Clear all DTCs with a scan tool before proceeding with DPF Service Regeneration. 2. Observe the scan tool DPF Regenerations Completed parameter and record the value. 3. Check the following fluid levels before and after this procedure: Engine oil Engine coolant Power steering Transmission Fuel level should be over 15 percent to ensure a successful regeneration. 4. Park the vehicle outside the facility, away from any obstacles, place the transmission in Park and apply the parking brake. 5. Ensure the hood is open. 6. Select DPF Service Regeneration in the Output Controls menu and follow the instruction on and remove any debris or mud build up at the exhaust cooler NOTE: Due to the elevated engine temperatures created while performing IMPORTANT: Do not refuel the vehicle during DPF Service Regeneration.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
the scan tool. 7. Command the DPF Service Regeneration with the scan tool. 8. The DPF Service Regeneration will take approximately 35 minutes consisting of the following: 1. 8 minutes for the exhaust system to warm up, with the engine speed slowly increasing to 1,600 RPM, then 2,200 RPM and finally 2,500 RPM 2. 20 minutes for the DPF to regenerate at 2,500 RPM 3. 3 minutes for the exhaust system to cool down with the engine speed will slowly returning to 1,400 RPM 4. 3 minutes at 800 RPM, then idle speed of 680 RPM 9. The DPF Service Regeneration will be terminated if any of the following actions are performed: Applying the brake pedal Applying the accelerator pedal Selecting Drive or Reverse Commanding DPF Service Regeneration OFF using the scan tool or disconnecting the 10. After the service regeneration completes, allow the vehicle to idle for an additional 2 minutes while monitoring the scan tool DTC information. There should be no additional If DTC P244B sets, replace the Exhaust Particulate Filter. If service regeneration aborted or failed, repair the vehicle for the condition indicated 11. Ignition OFF for 90 seconds, perform the following within 10 minutes of a completed service regeneration. Operate the vehicle within the following conditions to run the DTC. If DTC P2002 sets, replace the Exhaust Particulate Filter. IMPORTANT: The DPF Service Regeneration will be automatically Temporary blue, gray, or white smoke during this
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
12. Verify that the scan tool DPF Soot Mass parameter is less than 10 grams. If greater than the specified range, refer to Service Regeneration Unsuccessful. 13. Verify that the scan tool DPF Regenerations Completed parameter has increased by one. If the value has not increased by one, refer to Service Regeneration Unsuccessful. Service Regeneration Unsuccessful The scan tool DPF Regen Inhibit Reason parameter, will display a reason for not enabling The scan tool DPF Regeneration Status parameter will display Active or Required The scan tool DPF Regenerations Completed parameter did not increment. The scan tool DPF Soot Mass parameter, will display greater than 10 grams, indicating Service Regeneration Status Fault Table EXHAUST PARTICULATE FILTER REPLACEMENT (6.6L - PICKUP) Removal Procedure DPF Regeneration Parameters Successful Regeneration Unsuccessful Regeneration DPF Regeneration Status Complete Active or Required DPF Regeneration Reason None Fuel Used Engine Run Time Distance Traveled DPF Pressure Soot Mass Calculated Soot DPF Regeneration Inhibit None Varies DPF Soot Mass Less than 10 grams Greater than 10 grams
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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