P2002

DTC P2002

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* 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 (EPF) 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, P0102, P0103, P0545, P0546, P0642, P0643, P0652, P0653, P0698, P0699, P2032, P2033, P2227, P2228, P2453, P2454, and P2455 are not set.
* A regeneration event must be complete.
* The vehicle speed is greater than 40 km/h (25 mph).
* The engine load is greater than 25 percent.
* Engine Run Time Since Last DPF Regeneration is less than 10 minutes.
* Distance Since Last DPF Regeneration is less than 30 km (18.6 mi).
* The Soot Mass is less than 40 grams.
* DTC P2002 runs once when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the particulate filter has degraded below a calibrated threshold for greater than 30 seconds.

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.

Circuit/System Verification

1. Verify that DTCs P003A, P0047, P0048, P0101, P0201-P0208, P0234, P0299, P02A1, P02A5, P02AD, P02B1, P02B5, P02B9, P029D, P0300-P0308, P0401, P0402, P046C, P0545, P0546, P2032, or P2033 are not set.

^ If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions

2. Verify that leaks do not exist in the exhaust system. Refer to Exhaust Leakage. Exhaust Leakage
3. Engine running at idle, perform the following:

1. Engine coolant temperature greater than 80°C (176°F).
2. Command the EGR solenoid with a scan tool to 25 percent.
3. Perform 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 seconds, while observing the exhaust from the tailpipe. There should be very light or no smoke visible from the tailpipe.

^ If a heavy black smoke is observed from the vehicles tailpipe, replace the particulate filter assembly.

Circuit/System Testing

Important: Perform the Repair Verification after completing the Circuit/System Testing.

1. Verify the integrity of the entire exhaust system by visually inspecting for the following conditions:

* Any damaged components
* Improper installation. The exhaust differential pressure lines should have a continuous downward gradient, without bends or kinks, from the differential pressure sensor to the particulate filter.
* Improperly routed exhaust differential pressure sensor lines. The smaller line connects to the front of the exhaust particulate filter.

2. Remove the exhaust differential pressure sensor lines. Visually inspect the lines for restrictions.

^ If a condition is found, replace the exhaust differential pressure lines.

3. Verify the integrity of the entire air induction system by inspecting for the following conditions:

* Restrictions in the air induction system and the turbocharger system
* Leaks in the intake air ducts and the turbocharger ducts
* Cracked or damaged MAF sensor housing
* 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.

4. Test the charge air cooler system for leaks.

^ If a charge air cooler leak is found, repair as necessary.

5. Test the engine for gaskets leaks.

^ If an engine gasket leak is found, repair as necessary.

6. If the air intake system, exhaust system, DPF components, and the charge air cooler test normal, replace the particulate filter.

Repair Instructions

* Exhaust Particulate Filter Replacement (6.6L (LMM))
* Exhaust Particulate Filter Cleaning (LMM DPF Service Regeneration) Exhaust Particulate Filter Cleaning (LMM DPF Regeneration Enable) for Regeneration Enable

Repair Verification

Notice: Refer to Diesel Particulate Filter (DPF) Regeneration Enable Notice.

Certain engine control conditions can cause the EPF to overload with soot. It will be necessary to clean the EPF as instructed to remove the excess soot accumulation. To avoid the customer's return to the service department, perform the Exhaust Particulate Cleaning procedure.