DTC P2002 or P2003 (LPL or LPV)
Diagnostic Instructions
DTC Descriptors
DTC P2002 00: Diesel Particulate Filter (DPF)
Low Efficiency |
DTC P2003 00: Diesel Particulate Filter (DPF)
Soot Accumulation |
Circuit/System Description
The diesel exhaust aftertreatment system consists of an under
hood pre-catalyst and an underbody catalyst. The underbody catalyst
also consists of the main diesel oxidation catalyst and the coated
Diesel Particulate Filter (DPF). One of the main purposes of the
DPF is to collect particulates from the engine exhaust in order to
minimize discharge of soot to the atmosphere. The soot particles
accumulate in the channels of the DPF and are burned off at regular
intervals through a process called regeneration. This prevents the
DPF from clogging. The ECM commands the DPF regeneration after
calculating various vehicle conditions such as DPF pressure
difference, exhaust gas temperature, engine oil quality, engine
speed, etc. Excessive accumulation of the soot in the DPF can cause
a drop in the engine performance. During regeneration, additional
fuel is injected via multiple post injections in order to increase
the exhaust gas temperature. During this period, the DPF
temperature is raised to approximately 600°C (1 112°F) and
the accumulated soot is oxidized or burned off into carbon dioxide
(CO2).
Conditions for Running the DTC
DTC P2002 and P2003
• |
The DTC runs continuously when
the above condition is met. |
Conditions for Setting the DTC
P2002
The ECM detects that the pressure difference of the DPF is less
than 0.9 kPa (0.13 PSI).
P2003
The ECM detects that the pressure difference of the DPF is too
high.
Action Taken When the DTC Sets
DTC P2002 and P2003 are Type B DTCs.
Conditions for Clearing the DTC
DTC P2002 and P2003 are Type B DTCs
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
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
1. |
Ignition ON, observe the DTC
information with a scan tool. Verify that no other DTCs are
set. |
2. |
Engine idling, observe the
scan tool DPF differential pressure parameter. The reading should
be within 0-10 kPa (0-1.5 PSI). |
3. |
Operate the vehicle within the
Conditions for Running the DTC to verify the DTC does not reset.
You may also operate the vehicle within the conditions that you
observed from the Freeze Frame/Failure Records data. |
Circuit/System Testing
1. |
Ignition OFF, inspect the
hose/pipes to the B154 Diesel Particulate Filter Exhaust
Differential Pressure Sensor for leaks, or restrictions.
|
⇒ |
If a condition is found, repair as necessary. |
2. |
Ignition OFF, disconnect the
harness connector at the B154 Diesel Particulate Filter Exhaust
Differential Pressure Sensor. |
3. |
Test for less than 5 Ω
between the low reference circuit terminal 2 and ground.
|
⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
4. |
Ignition ON, test for 4.8-5.2
V between the 5 V reference circuit terminal 1 and ground.
|
⇒ |
If less than the specified range, test the 5 V
reference circuit for a short to ground or open/high resistance. If
the circuit tests normal, replace the K20 Engine Control
Module. |
⇒ |
If greater than the specified range, test the 5 V
reference circuit for a short to voltage. If the circuit tests
normal, replace the K20 Engine Control Module. |
5. |
Verify the scan tool DPF
differential pressure sensor voltage parameter is greater than 4.8
V. |
⇒ |
If less than the specified range, test the signal
circuit for a short to ground. If the circuit tests normal, replace
the K20 Engine Control Module. |
6. |
Install a 3 A fused jumper
wire between the signal circuit terminal 3 and the earth circuit
terminal 2. Verify the DPF differential pressure sensor voltage
parameter is less than 0.5 V. |
⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage or an open/high resistance.
If the circuit tests normal, replace the K20 Engine Control
Module. |
7. |
Ignition OFF, connect the
harness connector at the B154 Diesel Particulate Filter Exhaust
Differential Pressure Sensor. |
8. |
Ignition ON, observe the scan
tool DPF differential pressure sensor voltage parameter. The scan
tool should display within 0.3-0.55 V. |
⇒ |
If not within the specified range, replace the
B154 Diesel Particulate Filter Exhaust Differential Pressure
Sensor. |
9. |
If all circuit tests normal,
replace the DPF. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|