Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3543
PID: SID 115
SPN: 4094
FMI: 31
Description: NOx Limits Exceeded Due to Insufficient Reagent Quality – Condition Exists
Troubleshooting:
Reason:
NOx Limits Exceeded Due to Insufficient Reagent Quality – Condition Exists. The diesel
exhaust fluid quality is not sufficient enough to provide adequate NOx reduction.
Effect:
Possible reduced engine performance.
Circuit Description:
The engine control module (ECM) monitors the NOx concentration in the engine’s exhaust
gases using an aftertreatment intake NOx sensor and an aftertreatment outlet NOx sensor. By
comparing these two values, the ECM is able to determine the conversion efficiency of the
SCR catalyst and dosing system.
Component Location:
The SCR catalyst is located in the vehicle’s exhaust system, after the diesel particulate filter
and decomposition tube.
Conditions for Running the Diagnostics:
This diagnostic runs after the diesel exhaust fluid tank has been refilled. Specific engine and
aftertreatment conditions must be met. NOx sensor data is gathered over varying engine
speeds and loads. When enough data has been gathered, the diagnostic will run, make a
pass/fail decision, and begin to gather data again.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the NOx conversion across the SCR catalyst was
less than expected, and the diesel exhaust fluid tank has recently been refilled.
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) Engine torque will be severely reduced.
Conditions for Clearing the Fault Code:
It is necessary to use the “Reset All Faults” command in INSITE™ electronic service tool to
clear this fault and extinguish the amber CHECK ENGINE lamp and/or Malfunction Indicator
Lamp (MIL).
Shop Talk:
Troubleshoot all other active NOx sensor and SCR dosing system related fault codes before
this fault.
Possible Causes:
1) Malfunctioning diesel exhaust fluid dosing system
2) Exhaust system leaks
3) Malfunctioning SCR catalyst
4) Degraded, diluted, or incorrect diesel exhaust fluid
5) Diesel exhaust fluid deposits in the decomposition tube
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3683
PID: SID 27
SPN: 1127
FMI: 7
Description: Engine Turbocharger 1 Boost Pressure – Mechanical System Not Responding or
Out of Adjustment
Troubleshooting:
Reason:
Engine Turbocharger 1 Boost Pressure – Mechanical System Not Responding or Out of
Adjustment.
Effect:
Possible reduced engine performance
Circuit Description:
The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The
VGT actuator is a smart device and receives information via the J1939 data link from the
primary engine control module (ECM). The VGT actuator performs its own diagnostics and
reports malfunctions back to the primary engine ECM, using the J1939 data link. The ECM
then decodes the error message and converts it to a fault code.
Component Location:
The VGT actuator is located on the turbocharger bearing housing.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes:
The Variable Geometry Turbocharger (VGT) actuator position could not meet the commanded
position for greater than 10 seconds.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp
(MIL) after the diagnostic fails on two consecutive trips.
2) The VGT actuator will continue to attempt to meet the commanded position.
3) Active and stationary regeneration of the diesel particulate filter will be disabled.
4) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
5) Diesel exhaust fluid injection into the aftertreatment system is 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 ECM will turn off the amber CHECK ENGINE lamp and/or MIL immediately after the
diagnostic runs and passes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE
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.
Shop Talk:
N/A
Possible Causes:
1) A malfunctioning turbocharger actuator
2) A malfunctioning turbocharger
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3724
PID: 168
SPN: 168
FMI: 17
Description: Battery 1 Voltage – Data Valid But Below Normal Operating Range – Least Severe
Level
Troubleshooting:
Reason:
Battery 1 Voltage – Data Valid But Below Normal Operating Range – Least Severe Level. Low
voltage to the EGR valve device driver has been detected.
Effect:
Possible reduced engine performance.
Circuit Description:
The EGR valve device driver in the ECM provides power to the EGR valve motor. The EGR
valve motor is used to move the EGR valve to the correct position, as commanded by the
ECM.
Component Location:
The EGR valve device driver is internal to the ECM and can not be serviced separately.
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 low power at the EGR valve device driver. The
ECM was no longer able to control the EGR valve.
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:
This fault code indicates an internal failure in the ECM
Possible Causes:
1) Inactive fault codes
2) Faulty ECM
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 4163
PID: N/A
SPN: 5742
FMI: 16
Description: Aftertreatment Diesel Particulate Filter Temperature Sensor Module – Data Valid
But Above Normal Operating Range – Moderately Severe Level
Troubleshooting:
Reason:
Aftertreatment Diesel Particulate Filter Temperature Sensor Module- Data Valid But Above
Normal Operating Range – Moderately Severe Level. High internal temperature detected in the
aftertreatment diesel particulate filter temperature sensor module.
Effect:
Possible reduced engine performance
Circuit Description:
The aftertreatment diesel particulate filter temperature sensor module is a smart device that
communicates with the engine control module via the J1939 data link. The aftertreatment
diesel partculate filter temperature sensor module performs its own internal diagnostics and
reports malfunctions back to the engine control module using the J1939 data link. The
aftertreatment diesel particulate filter temperature sensor module is used to measure the
aftertreatment diesel oxidation catalyst intake temperature, aftertreatment diesel particulate
filter intake temperature, and aftertreatment diesel particulate filter outlet temperature. The
temperature probes are permanently attached to the aftertreatment diesel particulate filter
temperature sensor module and can not be replaced individually.
Component Location:
The aftertreatment diesel particulate filter temperature sensor module is mounted on the
aftertreatment diesel particulate filter.
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 aftertreatment diesel particulate filter temperature sensor module reported the internal
circuit board temperature was too high.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp
(MIL) after the diagnostic fails on two consecutive trips.
2) Active and stationary regeneration of the diesel particulate filter 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:
This fault code indicates the internal temperature of the aftertreatment diesel particulate filter
temperature sensor module was too high. Troubleshoot the exhaust system for leaks, missing
heat shields, or dirt and debris that could lead to over heating of the aftertreatment diesel
particulate filter temperature sensor module.
Possible Causes:
1) Inactive fault codes
2) Faulty aftertreatment DPF temperature sensor module
3) Faulty ECM