• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5-Volt Reference | P0641 00 | -- | P0641 00 | -- |
Signal | P2454 00 | P2454 00 | P2455 00 | P2453 00 |
Low Reference | -- | P2455 00 | P2454 00 | -- |
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-volt 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.
• | The engine has been running and then turned off for at least 60 s. |
• | DTC P2453 runs continuously when the engine is running. |
and |
• | DTC P2453 runs once after the ignition has been turned OFF. |
• | 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. |
DTCs P2453 is a Type A DTC.
DTCs P2453 is a Type A DTC.
• | 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. |
Component Connector End ViewsComponent Connector End Views
Exhaust Particulate Filter System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
EN-23738-A Mityvac
For equivalent regional tools, refer to Special Tools.
⇒ | If any of the DTCs are set, refer to Control Module References. |
Note: Perform the Repair Verification after completing the Circuit/System Testing.
• | 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. |
⇒ | If a condition is found replace the exhaust pressure lines. |
⇒ | If less than the specified range, and the parameter decreases as engine speed is increased, inspect for incorrect differential pressure line routing. |
⇒ | 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 (ECM). |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM). |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM). |
⇒ | 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 (ECM). |
⇒ | 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 (ECM). |
⇒ | If greater than the specified range, test the 5-volt reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM). |
⇒ | 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 (ECM). |
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.
⇒ | If the voltage is erratic, replace the B154 Diesel Particulate Filter Pressure Sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |