P2002

DTC P2002 Diesel Particulate Filter Low Efficiency

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. If the ECM detects that the exhaust differential pressure is certain pressure low as compared with the calculated exhaust gas flow amount this DTC will set.

Condition for Running the DTC

^ DTCs P0079 P0080 P0102 P0103 P0116 P0117 P0118 P02E8 P02E9 P0405 P0406 P0652 P0653 P2032 P2033 P2228 P2229 P2454 and P2455 are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.
^ The engine speed is more than 1200 RPM.
^ The fuel injection quantity is more than 30mm3.
^ The barometric pressure is more than 11 psi (75 kPa).
^ The engine coolant temperature is between 149 to 198°F (65 to 92°C)
^ The intake airflow valve position is more than 50%.
^ The turbocharger control is under normal condition.
^ The exhaust brake valve is commanded OFF.

Condition for Setting the DTC

^ The ECM detects that the exhaust differential pressure is less than a predetermined range of the calculated pressure value for longer than 7 seconds

Action Taken When the DTC Sets

^ The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type B.
^ The ECM inhibits EGR control.

Condition for Clearing the DTC

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

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.
^ Misrouted disconnected or plugged exhaust differential pressure hoses or pipes will set this DTC.

Circuit/System Testing DTC P2002