Astra J
DTC P2454 or P2455Diagnostic Instructions
DTC DescriptorsDTC P2454 00: Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit Low VoltageDTC P2455 00: Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit High Voltage DTC P2455 01: Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit Short to Battery DTC P2455 11: Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit High Input Diagnostic Fault Information
Circuit/System DescriptionThe diesel exhaust aftertreatment system consists of an underhood pre-catalyst and an underbody catalyst. The underbody catalytic converter 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
Conditions for Setting the DTCP2454The ECM detects an open circuit or a short to ground greater than 2 s. P2455The ECM detects the DPF differential pressure sensor signal is greater than 4.9 V for greater than 1 s. Action Taken When the DTC Sets
Conditions for Clearing the DTC
Reference InformationSchematic ReferenceConnector End View ReferenceDescription and OperationExhaust Particulate Filter System Description Electrical Information ReferenceDTC Type ReferencePowertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool ReferenceControl Module References for scan tool information Circuit/System Verification
Circuit/System Testing
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. 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. 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. 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. Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure.
|
||||||||||||||||||||||||||||||||||||||||