Cummins ISX15 CM2250 (2010-12) Fault Code: 2764 PID: 131 SPN: 1209 FMI: 16 Exhaust Gas Pressure- Data Valid But Above Normal Operating Range- Moderately Severe Level

Circuit Description
The exhaust gas pressure sensor is used to measure exhaust gas pressure in the exhaust manifold. This information is used by the engine control module (ECM) to control emissions and exhaust gas recirculation (EGR) valve operation, if equipped. The ECM provides a 5-VDC supply to the exhaust gas pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The exhaust gas pressure sensor provides a signal to the ECM on the exhaust gas pressure sensor signal circuit. This sensor signal voltage changes, based on the pressure in the exhaust manifold.

Component Location
The exhaust gas pressure sensor is located above the front section of the exhaust manifold and is plumbed into the exhaust manifold.

Conditions for Running the Diagnostics
This diagnostic runs continuously when engine speed is greater than 500 rpm.

Conditions for Setting the Fault Codes
This fault code is logged when the exhaust gas pressure sensor is reading a value above the engine protection limits.

Action Taken When the Fault Code is Active
An engine derate will be activated to bring exhaust gas pressure below the maximum operating limits.

Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highway driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop Talk
Possible causes of this fault code include:

A malfunctioning variable geometry turbocharger
A damaged in-range exhaust gas pressure sensor
A plugged or restricted aftertreatment diesel particulate filter
A plugged or restricted EGR cooler.

Possible Cause:
1) ECM calibration