Exhaust Gas Recirculation Valve Differential Pressure – Data Valid But Above Normal Operating Range – Moderately Severe Level
|Fault Code: 2359
Exhaust Gas Recirculation Valve Differential Pressure – Data Valid But Above Normal Operating Range – Moderately Severe Level. The EGR differential pressure sensor has detected high EGR gas flow, or the EGR differential pressure reading is not valid for engine operating conditions.
EGR valve actuation will be disabled.
ISB, ISC, and ISL – Differential Pressure Sensor Circuit
The exhaust gas recirculation (EGR) differential pressure sensor has two ports that sense exhaust pressure. The sensor outputs a voltage which represents the pressure difference between the two ports. The electronic control module (ECM) uses this pressure differential 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.
The EGR differential pressure sensor measures the exhaust gas pressure drop across the EGR differential pressure orifice. This pressure drop is used to calculate the amount of EGR flow into the intake manifold.
The EGR differential pressure sensor is located on the air intake connection. Refer to Procedure 100-002 in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the following conditions are met:
- The EGR valve position is less than 5 percent open
- The engine speed is less than a calibratible value
- Engine torque output is less than a calibratible value.
Conditions for Setting the Fault Codes
EGR differential pressure is greater than a calibratible value when the EGR valve position is less than 5 percent open and engine torque is less than a calibratible value.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- EGR valve operation will be disabled.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Verify that 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, calibrate the ECM. Refer to Procedure 019-032 in Section 19.
This diagnostic checks the reading of the differential pressure sensor when the EGR valve is closed. Since the EGR valve is closed, the reading of the EGR differential pressure should be 0. If the ECM detects a reading higher than expected with the EGR valve closed, this fault code is logged.
Possible causes of this fault code include:
- A damaged EGR differential pressure sensor
- A stuck open EGR valve
- EGR differential pressure sensor flow port cross-drillings are plugged with soot.