Cummins ISB4.5 CM2150 Fault Code: 3151 PID: SPN: 4794 FMI: 31 Aftertreatment SCR Catalyst System Missing - Condition Exists. - EcuForce Truck (2024)

FAQs

What is the code 4334 on a Cummins fault? ›

What does fault code SPN 4334 mean? SPN 4334 indicates that the diesel exhaust fluid (DEF) pressure is too low and below the normal operating range.

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.

If the 3135 and 125 are connected, the DOC may be plugged or the SCR may be plugged. If they are not connected the 3135 may be a sensor issue, wiring issue or a leak on one of the differential pressure sensor tubes.

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. Symptoms include the illumination of the check engine light and potential engine derate mode.

Key points include: - The intake manifold pressure sensor monitors intake pressure and reports to the ECM. Fault code 433 indicates an issue with the sensor circuit. - Troubleshooting starts by inspecting the sensor and harness for damage. Pins are checked for issues.

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.

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.

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. These codes are integral to the CAN Bus system, facilitating precise monitoring and troubleshooting of vehicular systems.

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.

6.7L Cummins, 2018 KW, Code 3134. "DPF outlet pressure sensor circuit voltage below normal or shorted to low. Low signal.

What is SPN code 3251 Cummins? ›

SPN 3251/FMI 1 - GHG14

This diagnostic is typically Diesel Particulate Filter (DPF) Pressure Out of Range Low. This fault code sets when the pressure across the DPF is less than 1.5 kPa (0.2 psi) for more than 10 seconds.

The most common cause of the P0720 code and its related codes is usually a defective or damaged output or input speed sensor. Sometimes, corroded wiring causes the code to set, as well as loose connectors surrounding either sensor.

How do you clean a NOx sensor? Cleaning a NOx sensor is not recommended. NOx sensors are actually self-cleaning, so if the sensor is displaying signs that it isn't working properly, it should be replaced rather than cleaned manually to solve the issue.

The NOx sensor is part of the NOx reduction aftertreatment system used in diesel vehicles with urea based SCR systems. The sensor located upstream of the SCR catalyst directly measures the engine-out NOx gas concentration, which helps determine the optimum amount of urea injection.

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. A plugged or faulty DEF doser.

The diagnostic trouble code (DTC) P0743 stands for “Torque Converter Clutch Solenoid Circuit Electrical.”

A sensor which detects the operating pressure of fluid in the diesel exhaust fluid system.

Low voltage during cranking can cause the ECM power supply to drop below specifications and log Fault Code 434 . Corrupted voltage (short interruptions or spikes that can only be seen with a with a oscilloscope) on keyswitch line can cause this fault.

SPN 4334 flags a discrepancy within the DEF Pressure sensor circuit, whether it's an invalid reading or an indication of a circuit fault.