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Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2274 PID: P411 SPN: 411 FMI: 4/4 LAMP: Amber SRT: |
Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the EGR differential pressure sensor circuit. |
EGR valve actuation will be disabled. |
 ISB, ISC, and ISL with CM2150 – EGR Differential Pressure Sensor Circuit
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Circuit Description
The exhaust gas recirculation (EGR) differential pressure sensor has two ports that sense exhaust gas pressure. The sensor outputs a voltage which represents the pressure difference between the two ports. The electronic control module (ECM) uses this pressure to determine how much exhaust gas is flowing through the EGR connection tube to the intake manifold. This information is used to control the EGR valve for correct emission levels.
The ECM provides a 5 volt supply to the EGR differential pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The EGR differential pressure sensor provides a signal to the ECM on the EGR differential pressure sensor signal circuit. This sensor signal voltage changes, based on the differential pressure in the EGR crossover tube.
Component Location
The EGR differential pressure sensor is located on the intake side of the engine. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
The ECM detects that the EGR differential pressure signal voltage is less than 0.26-VDC for more than 2 seconds.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- A default value for the EGR differential pressure sensor is used.
- The EGR valve will be closed.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
Possible causes of this fault code include:
- A signal circuit open or shorted to ground in the engine harness or sensor
- A supply wire open or shorted to ground
- A malfunctioning EGR differential pressure sensor.
Refer to Troubleshooting Fault Code t05-2274
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