Cummins ISX12 CM2250 (2010-12) Fault Code: 3151 (MR) PID: SPN: 4794 FMI: 31 Aftertreatment SCR Catalyst System Missing- Condition Exists - EcuForce Truck (2024)

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Circuit Description
The ECM monitors the NOx concentration in the engine’s exhaust gases using an aftertreatment intake NOx sensor and 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. Critically low NOx conversion efficiency is an indication of a missing SCR catalyst.

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 has to meet specific engine and aftertreatment conditions to run and complete. 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 ECM has detected that the NOx conversion efficiency of the SCR catalyst is critically low.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails for two consecutive trips.
Diesel exhaust fluid injection into the aftertreatment system is disabled.
Engine torque will be reduced if the engine is operated for a limited period of time with the fault code active.
Engine torque will be severely reduced and vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.
Conditions for Clearing the Fault Code
After completing a stationary regeneration (as instructed in this fault code troubleshooting tree) and no additional faults become active, the repair has been validated. Note that this fault code will still be active
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 MIL

Shop Talk
Troubleshoot all other active NOx sensor and SCR dosing system related fault codes before this fault.

Possible causes of this fault include:

Incorrect calibration revision on INCAL? CD
Tampering with SCR catalyst system, removal of SCR catalyst from vehicle, or malfunctioning SCR catalyst
Malfunctioning diesel exhaust fluid dosing system
Exhaust system leaks
Degraded, diluted, or incorrect diesel exhaust fluid
Diesel exhaust fluid deposits in decomposition tube.
This fault code can be set as a result of multiple failure modes. All steps of the troubleshooting tree must be completed.

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 Cause:
1) Aftertreatment NOx sensor failure
2) Aftertreatment DEF dosing unit Filter failure
3) Aftertreatment SCR catalyst failure
4) ECM calibration

Related

Categories Cumminz, DTC TRUCKS, ISX12 CM2250 (2010-12)Tags 2010-12, 31, 3151, 4794, Aftertreatment, Catalyst, CM2250, Code, Condition, Cummins, Exists, Fault, FMI, ISX12, Missing-, MR, PID, SCR, SPN, System

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Cummins ISX12 CM2250 (2010-12) Fault Code: 3151 (MR) PID: SPN: 4794 FMI: 31 Aftertreatment SCR Catalyst System Missing- Condition Exists - EcuForce Truck (2024)

FAQs

What is fault code 3151 Cummins? ›

5655 is a derate fault and 3151is a fault that states that the SCR is missing. This is usually caused by a faulty outlet nox sensor in my experience.

What is code 4796 on Cummins? ›

This fault code becomes active when the aftertreatment diesel oxidation catalyst intake and aftertreatment diesel particulate filter intake temperature sensors do not detect the presence of a catalyst in the aftertreatment system.

What is code 4364 on Cummins? ›

In summary, SPN 4364 FMI 18 is an engine error code related to the aftertreatment system of a diesel engine. It can indicate a variety of issues, ranging from a faulty NOx sensor to a malfunctioning DEF system.

What is the FMI 12 code? ›

An FMI 12 code will tell us that the module or a component that is monitored by this module has gone bad and needs replaced. Data Communication errors are usually going to come from issues in CAN communication.

How do I reset my Cummins fault code? ›

Follow these steps to clear the Cummins fault codes with a scanner:
  1. Close the doors and insert the key into the ignition.
  2. Cycle the key five times from “off” to “run” without actually cranking the engine.
  3. On the fifth cycle, leave in run.
Jan 20, 2021

What is the code 141 on a Cummins fault? ›

Fault Code 141 indicates an issue with the oil pressure sensor circuit. The oil pressure sensor monitors engine oil pressure and reports readings to the ECM.

What is code 74 Cummins? ›

Fault Code 74 sets due to the engine failing to respond to torque or speed requests sent by the TECU. Possible causes for this fault are due to OEM issues and cannot be caused by the transmission wiring or TECU.

What is code 4144 Cummins? ›

The most probable cause of this fault code is a faulty particulate matter sensor.

What is the code SPN 91 on a Cummins engine? ›

SPN 91/FMI 7 - 2 Channel Accelerator Pedal Not Recognized is set by the driver partially depressing the throttle pedal during engine start-up and failing to release the pedal to idle for two seconds within two minutes of starting the engine before putting the truck in gear and attempting to drive away.

What is spn 4364 fmi 1? ›

SPN 4364/FMI 1. Description. This fault code sets when the Aftertreatment Control Module (ACM) detects that the NOx conversion is lower than a calibrated threshold. Monitored Parameter.

What is a NOx inlet sensor? ›

The inlet sensor measures the nitrogen oxide (NOx) levels in the exhaust before it passes through the SCR and reports this data to the ECU. Based on this, the ECU determines how much DEF the doser should inject into the exhaust gas.

What causes low NOx conversion efficiency? ›

Poor DEF Quality: Contaminated or diluted diesel exhaust fluid (DEF) can compromise SCR efficiency, leading to reduced NOx conversion rates. Low DEF Pressure: Inadequate DEF pressure impedes proper dosing, affecting NOx conversion performance.

What does spn mean in fault code? ›

SPN stands for Suspected Parameter Number which tells you the circuit where the fault occurred. For example, if you had a SPN 1791 code, it would point to a fault detected in the EGR Valve Control Circuit. FMI stands for Failure Mode Indicator which tells you the reason the fault code was set.

What is engine code 12? ›

No Distributor Reference Pulse (Diagnostic Test Active)

The Engine Control Module uses the distributor reference pulse to calculate the engine speed. On newer engines, the Crank Shaft Position Sensor performs this function. Fault Code Description. 12 - No Distributor reference pulse (diagnostic test active)

What is the FMI failure mode indicator? ›

The FMI may indicate that a problem with an electronic circuit or an electronic component has been detected. The FMI may also indicate that an abnormal operating condition has been detected. The codes are displayed in the form “SPN – FMI”.

What is DEF tank error? ›

What Triggers the DEF Light? Low diesel exhaust fluid levels will cause the DEF light to start blinking. In most cases, it reminds you to refill the DEF tank. However, seepage, faulty connectors, and damage can lead to leaks in the diesel exhaust fluid system.

What is the malfunction indicator lamp on a Cummins? ›

Malfunction Indicator Lamp (MIL) Lights up to warn the driver to schedule service soon. May light up in addition to other lamps. Red Stop Engine Lamp Indicates that engine must be stopped as soon as it is safe to do so.

What is fault code 951 Cummins? ›

Fault Code 951 Cylinder Power Imbalance Detected.

What is Cummins fault viewer? ›

INSITE™ Fault Viewer monitors public faults on a J1939 or J1708 network. It helps to isolate the probable cause of a system failure or error.

References

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