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P2453




DTC P2453

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 provides an overview of each diagnostic category.

DTC Descriptor

DTC P2453
- Diesel Particulate Filter (DPF) Differential Pressure Sensor Performance

Diagnostic Fault Information






Circuit/System Description

The exhaust pressure differential sensor measures the pressure difference across the inlet and outlet of the diesel particulate filter (DPF). The pressure difference across the DPF increases as the captured particulates in the DPF increase. A diaphragm within the differential pressure sensor is displaced by the pressure changes that occur from particulate matter loading. The differential pressure sensor provides a signal voltage to the ECM, relative to the back pressure as a function of exhaust flow, DPF temperature, and soot loading. The engine control module (ECM) supplies a 5 V reference circuit and a ground on the low reference circuit. The ECM converts the signal voltage input into a pressure value.

Conditions for Running the DTC

* DTC P0101, P2454, or P2455 are not set.

* The engine run time is greater than 10 s.

* The engine speed is greater than 600 RPM.

* The battery voltage is greater than 11 V.

* Accelerator pedal position input transitions from 100% for more than 2 s then to 0% for 2 s.

* The DTC runs continuously when the above conditions are met.
Or

* DTC P0101, P2454, or P2455 are not set.

* The battery voltage is greater than 11 V.

* After engine run time of greater than 5 minutes then Ignition OFF and all vehicle systems OFF for at least 2 minutes.

Conditions for Setting the DTC

* The ECM detects that the differential pressure does not respond relative to an increase or decrease in exhaust flow for greater than 3 s.
Or

* During engine shut-down, the ECM detects that the differential pressure is greater than or less than the calibrated threshold for greater than 60 s.

Action Taken When the DTC Sets

* DTC P2453 is a Type B DTC.

* A message center or an indicator may display Clean Exhaust Filter.

Conditions for Clearing the MIL/DTC

DTC P2453 is a Type B DTC.

Diagnostic Aids

* A skewed or stuck exhaust pressure differential sensor will cause this DTC to set.

* If the hoses are twisted, bent, they will not return to their normal size and shape. If the hoses are restricted, it may cause this DTC to set.

* A turbocharger charge air cooler (CAC) hoses leak may cause this DTC to set.

* An air induction air leak or a skewed mass air flow (MAF) sensor may cause this DTC to set.

* An engine stall, low engine idle speed, or an engine misfire may cause this DTC to set.

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 Reference

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

Special Tools

* J-23738-A - Mityvac

* J-35555 - Metal Mityvac

Circuit/System Verification

1. Ignition On.

2. Verify that DTC P0101, P0102, P0103, P0234, P0299, P0300-P0308, P0401, P0402, P0641, P0697, or P2563 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. Ignition On.

4. Observe the scan tool Particulate Filt. Pressure Variance parameter. The value should be between -1.0 and +0.3 kPa.

5. Engine idling at operating temperature.

6. Observe the scan tool Particulate Filt. Pressure Variance parameter. The reading should be between 0.0 and +3.0 kPa.

7. Observe the scan tool Particulate Filt. Pressure Variance parameter. Increase the engine speed to 3,000 RPM. The value should increase.

• If not within the specified range
Refer to Circuit/System Testing

• If within the specified range

8. 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.

9. Verify DTC P2453 does not set.

• If the DTC sets
Refer to Circuit/System Testing

• If the DTC does not set

10. All OK.

Circuit/System Testing

1. Verify the following conditions do not exist with the air induction system:

* A loose air inlet duct

* A loose turbocharger air inlet clamp

* A damaged air cleaner housing

* A missing or damaged air cleaner restriction indicator

* A loose, leaking, or cracked intake manifold air resonator

* A cracked or damaged MAF sensor housing

* A skewed, stuck in range, or slow responding MAF sensor. Inspect the MAF sensor for contamination. Refer to DTC P0101 P0101.

• If a condition is found
Repair as necessary

• If no condition is found

2. Verify the following conditions do not exist with the DPF, exhaust, and fuel system:

* Any damaged exhaust system components

* Loose or improperly installed exhaust system components.

* Restrictions in the B154 exhaust pressure differential sensor ports

* Incorrect differential pressure line routing

* Damaged, bent, completely restricted, exhaust differential pressure lines-The lines should not be modified and should have a continuous downward gradient from the sensor.

* Inspect for fuel contaminates. Refer to Contaminants-in-Fuel Diagnosis Contaminants-in-Fuel Diagnosis.

• If a condition is found
Repair as necessary

• If no condition is found

3. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B154 exhaust pressure differential sensor. It may take up to 2 minutes for all vehicle systems to power down.

4. Test for less than 5 ohms between the low reference circuit terminal 1 and ground.

• If 5 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit

• If less than 2 ohms, replace the K20 Engine Control Module

• If less than 5 ohms

5. Ignition ON.

6. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the 5 V reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If greater than 5.2 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.

2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K20 Engine Control Module.

• If between 4.8-5.2 V

7. Verify the following conditions do not exist with the air induction system:

* A loose air inlet duct

* A loose turbocharger air inlet clamp

* A damaged air cleaner housing

* A missing or damaged air cleaner restriction indicator

* A loose, leaking, or cracked intake manifold air resonator

* A cracked or damaged MAF sensor housing

* A skewed, stuck in range, or slow responding MAF sensor. Inspect the MAF sensor for contamination. Refer to DTC P0101 P0101.

• If a condition is found
Repair as necessary

• If no condition is found

8. Verify the following conditions do not exist with the DPF, exhaust, and fuel system:

* Any damaged exhaust system components

* Loose or improperly installed exhaust system components-Ensure the smaller diameter pressure line is connected to the rear of the exhaust particulate filter and to the smaller port of the differential pressure sensor.

* Restrictions in the B154 exhaust pressure differential sensor ports

* Incorrect differential pressure line routing

* Damaged, bent, completely restricted, exhaust differential pressure lines-The lines should not be modified and should have a continuous downward gradient from the sensor.

* Inspect for fuel contaminates. Refer to Contaminants-in-Fuel Diagnosis Contaminants-in-Fuel Diagnosis.

• If a condition is found
Repair as necessary

• If no condition is found

9. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B154 Exhaust Pressure Differential Sensor. It may take up to 2 minutes for all vehicle systems to power down.

10. Test for less than 5 ohms between the low reference circuit terminal 1 and ground.

• If 5 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit

• If less than 2 ohms, replace the K20 Engine Control Module

• If less than 5 ohms

11. Ignition ON.

12. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the 5 V reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If greater than 5.2 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.

2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K20 Engine Control Module.

• If between 4.8-5.2 V

13. Verify the scan tool DPF pressure sensor parameter is greater than 4.8 V.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit terminal 2 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If greater than 4.8 V

14. Verify the scan tool DPF Pressure Sensor parameter is less than 0.20 V.

• If 0.2 V or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Ignition ON.

3. Test for less than 1 V between the signal circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit

• If less than 1 V

1. Ignition OFF.

2. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If less than 0.2 V

15. If all circuits and the B154 exhaust pressure differential sensor lines test normal, test or replace the B154 Exhaust Pressure Differential Sensor.

Component Testing

Note: You must perform the Circuit/System Testing in order to verify the integrity of the B154 Exhaust Pressure Differential Sensor circuits before proceeding with Component Testing.

1. Ignition OFF.

2. Remove the B154 Exhaust Pressure Differential Sensor.

3. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 3 and the corresponding terminal of the B154 Exhaust Pressure Differential Sensor.

4. Install a jumper wire between the low reference circuit terminal 1 of the B154 Exhaust Pressure Differential Sensor and ground.

5. Connect a DMM between terminal 2 of the B154 Exhaust Pressure Differential Sensor and ground.

6. Ignition ON, with the J-23738-A - Mityvac or J-35555 - Metal Mityvac connected to the B154 Exhaust Pressure Differential Sensor rear pressure port, slowly apply vacuum while monitoring the voltage on the DMM. The voltage should vary and transition smoothly without any spikes or dropouts.

• If the voltage does not vary or transition smoothly
Replace the B154 Exhaust Pressure Differential Sensor.

• If the voltage varies and transitions smoothly

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Exhaust Pressure Differential Sensor Pipe Replacement Exhaust Pressure Differential Sensor Pipe Replacement

* Exhaust Pressure Differential Sensor Replacement Exhaust Pressure Differential Sensor Replacement

* 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.

* Control Module References Control Module References for ECM replacement, programming, and setup

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