PACCAR PX-9 CM2350 (2013-17) Fault Code:2764 PID:131 SPN:1209 FMI:0 Exhaust Gas Pressure – Data Valid but Above Normal Operating Range – Moderately Severe Level

Reason:
Exhaust Gas Pressure – Data Valid but Above Normal Operating Range – Moderately Severe Level. High exhaust gas pressure has been detected by the exhaust gas pressure sensor.

Effect:
Possible reduced engine performance

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. The ECM provides a 5 volt 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 the engine is running.

Conditions for Setting the Fault Codes:
Exhaust gas pressure sensor reading was greater that 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:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
N/A

Possible Causes:
1) A malfunctioning variable geometry turbocharger
2) A damaged in-range exhaust gas pressure sensor
3) A plugged or restricted aftertreatment diesel particulate filter
4) A plugged or restricted EGR cooler