Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3235
PID: N/A
SPN: 4363
FMI: 16
Description: Aftertreatment SCR Outlet Temperature – Data Valid But Above Normal Operating
Range – Moderately Severe Level
Troubleshooting:
Reason:
Aftertreatment SCR Outlet Temperature – Data Valid But Above Normal Operating Range –
Moderately Severe Level. The SCR outlet temperature sensor reading has exceeded the
maximum temperature limit.
Effect:
Possible reduced engine performance.
Circuit Description:
The aftertreatment SCR (selective catalytic reduction) temperature sensor module is a smart
device that communicates with the engine control module via the J1939 data link. The
aftertreatment SCR temperature sensor module performs its own internal diagnostics and
reports malfunctions back to the engine control module using the J1939 data link. The
aftertreatment SCR temperature sensor module is used to measure the aftertreatment SCR
intermediate temperature and aftertreatment SCR outlet temperature. The temperature probes
are permanently attached to the aftertreatment SCR temperature sensor module and can not
be replaced individually.
Component Location:
The aftertreatment SCR temperature sensor module is mounted on the aftertreatment SCR
catalyst.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running and active regeneration of the
aftertreatment diesel particulate filter is not occurring.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the temperature at the SCR catalyst outlet
temperature sensor was greater than 650°C [1202°F] for more than 60 seconds.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and
fails.
2) Diesel exhaust fluid injection into the aftertreatment system is 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 red STOP 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:
This fault will go inactive immediately after the SCR outlet temperature drops below the
warning limit, and will likely be inactive when the vehicle is in the shop. For these reasons this
troubleshooting tree must be used for both active and inactive fault codes.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
For intermittent power supply and datalink communication issues with Aftertreatment
Components, it is highly recommended that the OEM Power Distribution Center fuses and
relays be thoroughly checked for loose, missing or intermittent connections.
Possible Causes:
1) Malfunctioning SCR catalyst
2) Degraded, diluted, or incorrect diesel exhaust fluid
3) Malfunctioning in-range SCR outlet temperature sensor
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3255
PID: N/A
SPN: 3246
FMI: 0
Description: Aftertreatment Diesel Particulate Filter Outlet Temperature – Data Valid But Above
Normal Operating Range – Moderately Severe Level
Troubleshooting:
Reason:
Aftertreatment Diesel Particulate Filter Outlet Temperature – Data Valid But Above Normal
Operating Range -Moderately Severe Level. The aftertreatment diesel particulate filter outlet
temperature sensor reading has exceeded the maximum engine protection temperature limit.
Effect:
Progressive power and/or speed derate increasing in severity from time of alert. If the Engine
Protection Shutdown feature is enabled, the engine will shut down 30 seconds after the red
STOP lamps starts flashing.
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 outlet temperature sensor is located in the
aftertreatment system. It is located at the outlet of the aftertreatment diesel particulate filter.
Refer to the original equipment manufacturer (OEM) service manual.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running and active regeneration of the
aftertreatment diesel particulate filter is not occurring.
Conditions for Setting the Fault Codes:
The aftertreatment diesel particulate filter intake temperature sensor reading was greater than
687°C [1269°F] for 90 seconds.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and
fails.
2) Active and stationary regeneration of the diesel particulate filter will be disabled.
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.
5) The engine will be shut down if the Engine Protection Shutdown feature is enabled.
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 red STOP 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:
This fault will go inactive immediately after the aftertreatment temperatures drop below the
warning limit, and will likely be inactive when the vehicle is in the shop. For these reasons, this
troubleshooting tree must be used for both active and inactive fault codes.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
Possible Causes:
1) Excessive engine oil or diesel fuel being introduced into the exhaust system from the engine
2) A damaged engine fuel injector causing unburned diesel fuel to enter the exhaust system
3) A face plugged aftertreatment diesel oxidation catalyst
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3385
PID: 105
SPN: 105
FMI: 1
Description: Intake Manifold 1 Temperature – Data Valid But Below Normal Operational Range –
Moderately Severe Level
Troubleshooting:
Reason:
Intake Manifold 1 Temperature – Data Valid But Below Normal Operational Range – Moderately
Severe Level. The intake manifold temperature is below a critical threshold
Effect:
None on performance.
Circuit Description:
The Engine Control Module (ECM) provides 5 volts to the intake manifold temperature signal
circuit, and monitors the change in voltage caused by changes in the resistance of the sensor
to determine the intake manifold temperature. When the intake air is cold, the sensor (or
thermistor) resistance is high. The ECM signal voltage only pulls down a small amount through
the sensor to a ground. Therefore, the ECM senses a high signal voltage or low temperature.
When the intake air is warm, the sensor resistance is low. The signal voltage pulls down a
large amount. Therefore, the ECM senses a low signal voltage, or a high temperature.
Component Location:
The intake manifold 1 pressure/temperature sensor is located in the air intake horn.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is operating at idle.
Conditions for Setting the Fault Codes:
The intake manifold temperature was less than 20°C [68°F] while the engine was idleing for an
extended period of time.
Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs
and fails.
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:
The EGR valve was closed because the engine was idling with cold intake manifold
temperatures for an extended period of time.
Possible Causes:
1) Inactive fault codes
2) Faulty ECM
Make: Cummins
Engine: ISL9 CM2350 (2013-17)
Fauld Code: 3541
PID: N/A
SPN: 51
FMI: 4
Description: Engine Intake Throttle Actuator Position Sensor Circuit – Voltage Below Normal or
Shorted to Low Source
Troubleshooting:
Reason:
Engine Intake Throttle Actuator Position Sensor Circuit – Voltage below normal, or shorted to
low source. Low signal voltage detected at the engine intake air throttle position sensor circuit.
Effect:
Possible reduced engine performance
Circuit Description:
The engine control module (ECM) controls the engine intake air throttle actuator. The ECM can
open and close the throttle based on the operating condtions in order to regulate air flow to the
engine.
Component Location:
The engine intake air throttle actuator is mounted in the piping between the charge air cooler
and intake manifold.
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 engine intake air throttle position sensor circuit
voltage was out of range low.
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 intake air throttle actuation will be disabled. The engine intake air throttle will default
to the open position.
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, 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 malfunctioning engine intake air throttle position sensor
2) A short circuit to ground in the engine harness
3) An open circuit in the engine harness