Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P2002: Diesel Particulate Filter Low EfficiencyDiagnostic Fault Information
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
5-Volt Reference Voltage | P0652 | P2454 | -- |
Signal Circuit | P2454 | P2455 | P2455 |
Ground Circuit | -- | P2455 | -- |
Circuit/System Description
The diesel particulate filter (DPF) differential pressure sensor is established to detect difference in pressure in DPD. The engine control module (ECM) always detects differential. pressure in DPD with DPD differential pressure sensor installed in DPD front and back, and detects quantity of sedimentation of PM.
Conditions for Running the DTC
| • | DTCs P0079, P0080, P0102, P0103, P0117, P0118, P0126, P02E7, P02E8, P0409, P0652, P0653, P2032, P2033, P2228, P2229, P2454, and P2455 are not set. |
| • | The battery voltage is between 10-16 volts. |
| • | The ignition switch is ON for longer than 2 seconds. |
| • | The exhaust throttle valve is not active. |
| • | The EGR valve position is between 95-100 percent. |
| • | The intake throttle position is between 70-72 percent. |
| • | The engine speed is between 1200-1250 RPM. |
| • | The engine coolant temperature is between 70-90°C (158-194°F). |
| • | The barometric pressure (BARO) is more than 72 kPa. |
Conditions for Setting the DTC
The ECM detects that the actual DPF differential pressure is less than the desired pressure for longer than 20 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.
Diagnostic Aids
Inspect for any recent engine exhaust system mechanical repairs. An incorrectly installed DPF differential pressure sensor will cause this DTC to set.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Important: If DTC P0079, P0080, P0102, P0103, P0117, P0118, P0126, P02E7, P02E8, P0409, P0652, P0653, P2032, P2033, P2228, P2229, P2454, and P2455 are not set, test and repair those DTCs first.
Verify the integrity of the engine exhaust system by inspecting for the following conditions:
| • | Damaged components |
| • | Loose or improper installation |
| • | DPF system |
Circuit/System Testing
Important: You must perform Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition OFF, inspect the DPF system for exhaust gas leakage.
- Ignition OFF, inspect the DPF filter.
- Ignition ON for longer than 30 seconds, learning the zero position of DPF differential pressure.
- Command the DPF regeneration with a scan tool. Perform the DPF regeneration.
- Clean the DPF filter with an Ash Cleaner.
- Start the engine and operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
| ⇒ | If detect the exhaust gas leakage for DPF system, repair or replace the DPF system. |
| • | Exhaust gas temperature sensor |
| • | DPF differential pressure sensor and pressure hose |
| • | DPF assembly |
| ⇒ | If detect the broken, clogged condition, melt of filter for DPF filter, replace the DPF filter. |
| ⇒ | If detect the DTC, replace the control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module (ECM) replacement, setup, and programming |
