P2002
DTC P2002
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor
DTC P2002
- Diesel Particulate Filter Efficiency
Circuit/System Description
The particulates in the exhaust gases are collected by the diesel particulate filter (DPF). When the filter becomes saturated with particulates, they are oxidized by a regeneration process. The regeneration process increases the exhaust gas temperature, heating the diesel oxidation catalyst (DOC), and the DPF. The accumulated particulate matter in the DPF will then be safely converted to harmless gases and the DPF will then be clean and ready to filter additional particulate matter.
The engine control module (ECM) monitors the system with inputs from two exhaust gas temperature (EGT) sensors 1 and 2 and a differential pressure sensor. This diesel particulate filter diagnostic provides a means for monitoring the exhaust particulate filter efficiency. The resistive exhaust flow is monitored to determine if a DPF substrate is missing or a defined DPF failure has occurred. The resistive exhaust flow is calculated from mass air flow and DPF differential pressure. This diagnostic will run after a successful regeneration event has completed. This includes a successful service regeneration event.
Conditions for Running the DTC
* DTCs P0101-P0103, P2228, P2229, P2453, P2454, and P2455 are not set.
* A regeneration event is active.
* The engine speed is greater than 600 RPM.
* The ambient air temperature is greater than -7°C (19°F).
* The BARO is greater than 75 kPa (11 psi).
* The engine run time is greater than 10 s.
* The DPF inlet and outlet temperatures are between 500-800°C (932-1472°F).
* DTC P2002 runs once a successful regeneration has completed.
Conditions for Setting the DTC
The ECM detects that the particulate filter has degraded beyond a calibrated threshold after a successful regeneration has completed.
Action Taken When the DTC Sets
DTC P2002 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2002 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Exhaust Aftertreatment System Description Exhaust Aftertreatment System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition On.
2. Verify that DTCs P003A, P0047, P0048, P0101-P0103, P0201-P0208, P0234, P0299, P0300-P0308, P0401, P0402, P046C, P0545, P0546, P2032, P2033, or P2454-P2455 are not set.
• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
• If none of the DTCs are set
3. Engine idling and at operating temperature
4. Verify very light or no black smoke is visible from the tailpipe while performing several accelerator pedal sweeps by rapidly depressing the accelerator pedal to wide open throttle (WOT) and returning the pedal to the at rest position, allowing the engine to return to idle speed for 5 s.
• If heavy black smoke is observed
Replace the Exhaust Particulate Filter
• If no heavy black smoke is observed
5. Verify the following conditions do not exist with the exhaust and DPF system:
* Any damaged, missing or altered components
* Leaks in the Exhaust system -Refer to Exhaust Leakage Testing and Inspection
* Improper installation-The exhaust differential pressure lines should have a continuous downward gradient, without sharp kinks, from the differential pressure sensor to the particulate filter.
* Improperly routed B154 exhaust pressure differential sensor lines.
* Completely restricted differential pressure sensor lines.
* Disconnected or broken differential pressure sensor lines.
• If a condition is found
Repair as necessary
• If no condition is found
6. Verify the following conditions do not exist with the air induction system:
* Restrictions in the air induction system and the turbocharger system
* Leaks in the intake air ducts and the turbocharger ducts. Perform the Induction System Smoke Test in Charge Air Cooler Diagnosis (Full System Air Leak Test) Charge Air Cooler Diagnosis (Full System Air Leak Test)Charge Air Cooler Diagnosis (Induction System Smoke Test) Charge Air Cooler Diagnosis (Induction System Smoke Test).
* Cracked or damaged B75B MAF sensor housing
* A skewed, stuck in range, or slow responding MAF sensor. Inspect the MAF sensor for contamination. Refer to DTC P0101 P0101.
* Inspect for a dirty air filter element
* Debris blocking the air sensing filaments of the MAF sensor
• If a condition is found
Repair as necessary
• If no condition is found
7. Test the charge air cooler system for leaks. Perform the Full System Air Leak Test in Charge Air Cooler Diagnosis (Full System Air Leak Test) Charge Air Cooler Diagnosis (Full System Air Leak Test)Charge Air Cooler Diagnosis (Induction System Smoke Test) Charge Air Cooler Diagnosis (Induction System Smoke Test).
• If a leak is found
Repair as necessary
• If no leak is found
8. Test the engine air induction system for leaks. Perform the Induction System Smoke Test in Charge Air Cooler Diagnosis (Full System Air Leak Test) Charge Air Cooler Diagnosis (Full System Air Leak Test)Charge Air Cooler Diagnosis (Induction System Smoke Test) Charge Air Cooler Diagnosis (Induction System Smoke Test).
• If a leak is found
Repair as necessary
• If no leak is found
9. Replace the Exhaust Particulate Filter.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Exhaust Particulate Filter Replacement (LGH-35 Series) Exhaust Particulate Filter Replacement (35 Series)Exhaust Particulate Filter Replacement (LGH) Exhaust Particulate Filter Replacement
Note: This procedure is not necessary if the SCR/DPF was replaced.
* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration procedure. After completing the service regeneration, perform the following to verify the diagnostic passed:
1. The transmission is in park or neutral.
2. Increase the engine speed to wide open throttle for 30 s.
3. Release the accelerator pedal.
4. Verify DTC P2002 does not set.
• If the DTC sets
A condition still exists.