DTC P2453
Diagnostic Instructions
DTC Descriptor
| DTC P2453 00: Diesel Particulate Filter (DPF)
Differential Pressure Sensor Performance |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5V Reference
|
P0641 00
|
-
|
P0641 00
|
-
|
Signal
|
P2454 00
|
P2454 00
|
P2455 00
|
P2453 00
|
Low Reference
|
-
|
P2455 00
|
P2454 00
|
-
|
|
| |
Circuit/System Description
The exhaust differential pressure sensor measures the pressure
difference across the inlet and outlet of the diesel particulate
filter. The pressure difference across the diesel particulate
filter increases as captured particulates in the diesel particulate
filter increases. A diaphragm within the exhaust differential
pressure sensor is displaced by the pressures change that occur
from particulate matter loading. The sensor translates this action
into electrical resistance. The engine control module supplies a 5
V reference circuit and a ground on the low reference circuit. The
exhaust differential pressure sensor provides a signal voltage to
the engine control module, relative to the back pressure as a
function of exhaust flow, diesel particulate filter temperature,
and diesel particulate filter soot loading. The engine control
module converts the signal voltage input to a pressure value.
Conditions for Running the DTC
| • |
The engine has been running
and then turned off for at least 60 s. |
| • |
DTC P2453 runs continuously
when the engine is running. |
| • |
DTC P2453 runs once after the
ignition has been turned OFF. |
Conditions for Setting the DTC
| • |
With the engine OFF the ECM
detects that the differential pressure is greater than or less than
the calibrated threshold for 0.5 s. |
| • |
With the engine running the
ECM detects that the differential pressure is greater than or less
than the calibrated threshold for 1 s. |
Action Taken When the DTC Sets
DTCs P2453 is a Type A DTC.
Conditions for Clearing the DTC
DTCs P2453 is a Type A DTC.
Diagnostic Aids
| • |
A skewed or stuck exhaust
differential pressure sensor will cause this DTC to set.
|
| • |
The flexible part of the
exhaust differential pressure lines are made of a high temperature
hose that is protected by a braided covering. If the hoses are
twisted or bent, they will not return to their normal size and
shape. If the hoses are restricted, it may cause this DTC to
set. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exhaust Particulate Filter System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EN 23738-A Mityvac
For equivalent regional tools, refer to
Special Tools .
Circuit/System Verification
| 1. |
Verify that DTCs P0651, P2454
and P2455 are not set. |
| 2. |
Ignition ON, engine OFF,
observe the scan tool DPF Differential Pressure parameter. The
value should be between -1.0 to +0.5 kPa (-0.14 to +0.07
PSI). |
| 3. |
Engine running at a warm
stabilized idle, observe the scan tool DPF Differential Pressure
parameter. The reading should be between 0.0-3.0 kPa (0.0-0.43
PSI) |
| 4. |
Engine running at a warm
stabilized idle, observe the scan tool DPF Differential Pressure
parameter. Increase the engine speed to 3 000 RPM. The value should
increase. |
| 5. |
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 data. |
Circuit/System Testing
Note: Perform the Repair
Verification after completing the Circuit/System Testing.
| 1. |
Verify the integrity of the
DPF system by visually and physically inspecting any of the
following conditions: |
| |
• |
Any damaged exhaust system
components |
| |
• |
Loose or improperly installed
exhaust system components |
| |
• |
Ensure the smaller diameter
pressure line is connected to the front of the DPF and to the
smaller port of the differential pressure sensor. |
| |
• |
Restrictions in the exhaust
differential pressure sensor ports |
| |
• |
Damaged, bent, restricted, or
kinked exhaust differential pressure lines. The lines should not be
changed and should have a continuous downward gradient from the
sensor. |
| 2. |
Remove and inspect the
flexible part of the exhaust differential pressure lines for
internal restrictions. |
| ⇒ |
If a condition is found replace the exhaust
pressure lines. |
| 3. |
Engine running, verify that
the scan tool DPF Differential Pressure parameter is greater than 0
kPa (0 PSI), and increases as engine speed is increased.
|
| ⇒ |
If less than the specified range, and the
parameter decreases as engine speed is increased, inspect for
incorrect differential pressure line routing. |
| 4. |
Ignition OFF, disconnect the
harness connector at the B154 Diesel Particulate Filter Exhaust
Differential Pressure Sensor. |
| 5. |
Ignition OFF and scan tool
disconnected for 90 s, test for less than 5 Ω between the low
reference circuit terminal 2 X1 and earth. |
| ⇒ |
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. |
| 6. |
Ignition ON, test for 4.8-5.2
V between the 5 V reference circuit terminal 1 X1 and
ground. |
| ⇒ |
If less than the specified range, test the 5 V
reference circuit for a short to ground or an 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. |
| 7. |
Verify the scan tool DPF
Differential Pressure parameter is between 4.8-5.2 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. |
| 8. |
Install a jumper wire between
the low reference circuit terminal 2 X1 and signal circuit terminal
3 X1. Verify the scan tool DPF Differential Pressure 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. |
| 9. |
Ignition OFF for 90 s,
disconnect the X1 harness connector at the K20 Engine Control
Module. |
| 10. |
Test for less than 5 Ω
between the 5 V reference circuit B154 Diesel Particulate Filter
Exhaust Differential Pressure Sensor terminal 1 X1 and the K20
Engine Control Module 5 V reference circuit terminal 27 X2.
|
| ⇒ |
If greater than the specified range, test the 5 V
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 11. |
Test for less than 5 Ω
between the signal circuit B154 Diesel Particulate Filter Exhaust
Differential Pressure Sensor terminal 3 X1 and the K20 Engine
Control Module signal circuit terminal 59 X2. |
| ⇒ |
If greater than the specified range, test the
signal circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 12. |
If all circuits DPF, and the
differential pressure lines test normal, test or replace the B154
Diesel Particulate Filter Exhaust Differential Pressure
Sensor. |
Component Testing
Note: You must perform the
Circuit/System Testing in order to verify the integrity of the
exhaust pressure differential sensor circuits before proceeding
with the Component Testing.
Static Test
| 1. |
Ignition OFF, remove the B154
Diesel Particulate Filter Exhaust Differential Pressure
Sensor. |
| 2. |
Install a 3 A fused jumper
wire between the 5 V reference circuit terminal 1 and the
corresponding terminal of the B154 Diesel Particulate Filter
Exhaust Differential Pressure Sensor. Install a jumper wire between
the low reference circuit terminal 2 of the B154 Diesel Particulate
Filter Exhaust Differential Pressure Sensor and ground.
|
| 3. |
Connect a DMM between the
signal circuit terminal 3 and ground. |
| 4. |
Ignition ON, with the EN
23738-A Mityvac , slowly apply vacuum to the sensor
while observing the voltage on the DMM. The voltage should vary and
transition smoothly without any spikes or dropouts. |
| ⇒ |
If the voltage is erratic, replace the B154 Diesel
Particulate Filter Exhaust Differential Pressure Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
