CM850 Electronic Control System – FAULT CODE 2274

EGR Valve Differential Pressure Sensor Circuit – Shorted Low


Overview

CODE REASON EFFECT
Fault Code: 2274
PID: P411
SPN: 411
FMI: 4/4
LAMP: Amber
SRT: 

EGR valve differential pressure sensor circuit – shorted low. Low signal voltage detected on the EGR valve differential pressure sensor circuit.

EGR valve will be closed.

EGR Valve Differential Pressure Sensor Circuit
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Circuit Description

The exhaust gas recirculation. (EGR) valve differential pressure sensor has two ports that sense a pressure drop across the EGR gas entrance to the intake connection. The electronic control module (ECM) uses this pressure drop to calculate the amount of EGR gas entering the intake. This calculation helps to determine the commanded position of the EGR valve (and VG turbocharger)
that will control the amount of EGR gas flow into the engine.

Component Location

The EGR valve differential pressure sensor is mounted on the side of the intake connection. Refer to Procedure 100-002 for a detailed component location view.

NOTE: The sensor is connected to the engine harness through a short pigtail harness. The pigtail harness is permanently affixed to the sensor. Do not try to remove the connector that is attached to the sensor body or damage to the sensor will occur.

Shop Talk

The EGR valve differential pressure sensor shares supply and return wires in the engine harness with other sensors. Open circuits and short circuits in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 2274, check for multiple faults.

  • Open signal circuit in the engine harness, connections, or sensor
  • Supply circuit open or shorted to ground
  • Sensor shorted to ground.

Refer to Troubleshooting Fault Code t05-2274

Last Modified:  08-Jul-2010