Cummins ISX15 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 the code SPN 4795 FMI 31? ›

SPN 4795/FMI 31 - MY13

This diagnostic is typically Particulate Filter (DPF) Outlet Temperature Response - Too Fast. NOTE: This fault indicates the ACM2. 1 has detected a sudden temperature shift on the DPF outlet temperature sensor.

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.

Typically, you will need to connect the jumper wire between specific pins to activate the fault code clearing process. Ensure that the jumper wire is correctly connected. Once the jumper wire is in place, wait for approximately 10 to 15 seconds. Then, disconnect the jumper wire from the diagnostic connector.

We also still had code 254 which according to the N14 book states that: less than 6 volts detected to fuel shutoff circuit/solenoid OR ECM excessive current draw from ECM or faulty ECM output circuit.

This diagnostic is typically Fuel Compensation Pressure (FCP) Sensor Circuit Failed Low.

A Suspect Parameter Number (SPN) is a specific code used in the automotive industry to identify and diagnose faults codes in electronic control units (ECUs) within vehicles.

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.

Fault code 1434 is for your unswitched battery power. Check between your batteries and your ECM for in-line fuse holder and also for any corrosion or damage within the wiring that powers your ECM. This indicates that there is a loss of unswitched battery power to the ECM.

This injection pump, often called a "P-pump," is the Holley Four-barrel carburetor of the diesel world. The P7100 pump has been around forever, is practically bulletproof, and is very tunable for high performance. Cummins Injection Pump Overview.

Using a code reader tool, connect to the ECM and find the “fault codes” tab. The displayed codes can generally be clicked on one by one. Another option is to select “erase all faults” and then follow the onscreen instructions. At the end of the procedure, the ignition key should be turned off.

How do I permanently clear my engine code? ›

Leaving the battery disconnected for a few minutes will ensure the vehicle systems will completely reset when you reconnect the battery. Secure the negative cable back to the terminal and cover it with the cap. Disconnecting the battery will clear the error codes and reset the check engine light.

Using an OBD2 Scanner:

Follow the scanner's instructions to navigate to the "Read Codes" option. Review the error codes for any needed repairs. Once you've addressed the issues or if you just want to clear the light, navigate to the "Clear Codes" or "Reset" option on the scanner.

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.

6.7L Cummins, 2018 KW, Code 3134. "DPF outlet pressure sensor circuit voltage below normal or shorted to low. Low signal voltage detected at the aftertreatment DPF outlet pressure sensor circuit." Is this a sensor or wiring issue?

Fault Code 3543-The diesel exhaust fluid quality is not sufficient enough to provide adequate NOx reduction.

SPN 521049/FMI 31

Description This Code Sets When There is a Code Present for the Diesel Exhaust Fluid (DEF) Tank Level, DEF Dosing Unit, DEF Pump, NOx Sensors, Blocked DEF Line, DEF Quality, NOx Efficiency, Selective Catalyst Reduction (SCR) Harness and/or SCR Sensor.

SPN is short for suspect parameter number. It identifies which electrical circuit, part or component of your truck isn't working properly. FMI stands for failure mode identifier—this part of the fault code tells you what type of problem your truck has.

This fault code indicates that the nox emissions are not being reduced enough by the SCR catalyst. There are many possible causes for this fault code including: Degraded DEF fluid. A faulty SCR catalyst.

Failure Mode Identifier (FMI) Codes on J1939 data link. The FMI is used along with the SPN to provide specific information that relates to a diagnostic trouble code (DTC). The FMI may indicate that a problem with an electronic circuit or an electronic component has been detected.