P2455

DTC P2455 Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage

Circuit Description

The exhaust differential pressure sensor is attached to the chassis frame near the diesel particulate filter (DPF) assembly. The exhaust differential pressure sensor is a transducer that varies voltage according to changes of the exhaust gas differential pressure between in front and in rear of filter. The sensor has the following circuits:

^ 5 volts reference circuit
^ Low reference circuit
^ Exhaust differential pressure sensor signal circuit

The exhaust differential pressure sensor provides a signal to the ECM on the signal circuit which is relative to the differential pressure changes in front and in rear of filter. The ECM should detect a low signal voltage at a low differential pressure such as small PM accumulation. The ECM should detect high signal voltage at high differential pressure such as large PM accumulation. If the ECM detects an excessively high signal voltage this DTC will set.

Condition for Running the DTC

^ DTCs P0652 P0653 and P2454 are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.

Condition for Setting the DTC

^ The ECM detects that the exhaust differential pressure sensor signal voltage is more than 4.75 volts for 1 second.

Action Taken When the DTC Sets

^ The ECM illuminates the MIL when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.
^ The ECM limits fuel injection quantity.
^ The ECM inhibits EGR control.
^ The ECM inhibits DPF regeneration control.
^ The ECM inhibits cruise control.
^ The ECM inhibits PTO control.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type A.

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.

Circuit/System Testing DTC P2455