PACCAR PX-9 CM2350 (2013-17) Fault Code:3136 PID: SPN:5019 FMI:3 Engine Exhaust Gas Recirculation Outlet Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source

Reason:
Engine Exhaust Gas Recirculation Outlet Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the EGR orifice pressure sensor.

Effect:
Possible reduced engine performance

Circuit Description:
The engine control module (ECM) provides a 5 volt supply to the EGR orifice pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The EGR orifice pressure sensor provides a signal to the ECM on the EGR orifice pressure sensor signal circuit. This sensor signal voltage changes based on the pressure at the EGR orifice pressure sensor.

Component Location:
The EGR orifice pressure sensor is mounted on the EGR mass measurement assembly near the EGR differential pressure sensor.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the EGR orifice pressure sensor signal voltage was greater than 4.75-volts for 5 seconds.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
3) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

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) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) 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) Open return circuit in the harness, connectors, or sensor
2) Signal circuit shorted to sensor supply or battery voltage