Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 2274
PID: 411
SPN: 411
FMI: 4
Description: Exhaust Gas Recirculation Differential Pressure Sensor Circuit – Voltage Below
Normal or Shorted to Low Source
Troubleshooting:
Reason:
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.
Effect:
Possible reduced engine performance
Circuit Description
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 located across an orifice in the EGR tube. The engine control module
(ECM) uses this pressure to determine how much exhaust gas is flowing in 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.
Component Location:
The EGR Valve and EGR Differential Pressure Sensor location varies depending on engine
model.
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 differential pressure signal voltage was
less than 0.26 VDC for more than 8 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) A default value for the EGR differential pressure sensor is used.
3) Diesel exhaust fluid injection into the aftertreatment system is disabled.
4) Active and stationary regeneration of the diesel particulate filter will be disabled.
5) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
6) 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) A signal circuit open or shorted to ground in the engine harness or sensor
2) A supply wire open or shorted to ground
3) A malfunctioning EGR differential pressure sensor
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 2376
PID: 412
SPN: 412
FMI: 4
Description: Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Below Normal or
Shorted to Low Source
Troubleshooting:
Reason:
Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Below Normal or Shorted to
Low Source. Low signal voltage detected at EGR temperature circuit
Effect:
Possible reduced engine performance.
Circuit Description:
The exhaust gas recirculation (EGR) temperature sensor is a variable resistor sensor and is
used to measure the temperature of the EGR gas flow after it exits the EGR cooler. The engine
control module (ECM) supplies 5 volts to the EGR temperature signal circuit. The ECM
monitors the change in voltage caused by changes in the resistance of the sensor to determine
the EGR flow temperature.
The EGR temperature value is used by the ECM for the engine protection system and engine
emissions control.
Component Location:
The EGR temperature sensor is located on the EGR connection tube between the EGR cooler
and the air intake connection.
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 temperature signal voltage was less than
0.05-VDC for more than 8 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) A default value for the exhaust gas recirculation temperature reading is used.
3) Diesel exhaust fluid injection into the aftertreatment system is disabled.
4) Active and stationary regeneration of the diesel particulate filter will be disabled.
5) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
6) 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:
The EGR temperature sensor shares return wires in the engine harness with other sensors. An
open return can cause multiple fault codes to be active.
Possible Causes:
1) A signal shorted to ground in the harness
2) A signal shorted to return or ground in the sensor
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 2554
PID: 131
SPN: 1209
FMI: 2
Description: Exhaust Gas Pressure 1 – Data Erratic, Intermittent, or Incorrect
Troubleshooting:
Reason:
Exhaust Gas Pressure – Data Erratic, Intermittent or Incorrect. The exhaust gas pressure
sensor is reading an erratic value.
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 consists of two parts:
One part runs immediately after the keyswitch is turned OFF, and the engine coolant
temperature is above 70°C or 158°F. The second part runs continuously while the engine is
running.
Conditions for Setting the Fault Codes:
1) The Engine Control Module (ECM) detected the exhaust pressure reading was higher or
lower than the other absolute pressure sensors when the keyswitch is OFF and the engine is
not running.
2) The Engine Control Module (ECM) detected the exhaust pressure was higher or lower than
expected during normal engine operation.
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) A default value is used for the exhaust gas pressure sensor reading.
3) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
4) 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, first ensure the engine coolant temperature is above 70°C or 158° F.
Operate the engine if necessary.
2) Cycle the keyswitch to the ON position for 30 seconds, then cycle the keyswitch to the OFF
position for 30 seconds. Start the engine and run it at high idle for up to 5 minutes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE
immediately after the diagnostic runs and passes.
4) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs
and passes.
5) 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.
6) 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) Stuck in-range exhaust gas pressure sensor reading
2) High resistance in the exhaust gas pressure sensor signal or return lines
3) Plugging or restriction in the exhaust gas pressure sensor tube
4) Leaks in the exhaust system