Cummins ISB4.5 CM2150 Fault Code: 1993 PID: SPN: 4795 FMI: 31 Aftertreatment Diesel Particulate Filter 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.

(DPF Stay Warm) Aftertreatment Diesel Particulate Filter Temperature Stabilization: Allows the DPF to stay warm when, during an in-motion regeneration event, the vehicle speed drops below a specified threshold.

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.

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.

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.

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.

A very common way to begin cleaning a DPF is to use high-pressure, compressed air. You can achieve this best by using a high-pressure cleaning cabinet, which backflush compressed air into the filter and forces ash to dislodge any blockage.

When it comes to diesel particulate filter (DPF) regeneration, there are three types: Passive -- This occurs when the load and speed of the engine produce temperatures greater than 350 degrees C, and it burns off the trapped soot as the vehicle operates.

This indicates a higher level of soot in the DPF. A flashing DPF Lamp combined with an illuminated Warning or Check Engine Lamp indicates that the Aftertreatment DPF needs regeneration immediately. A parked regeneration is required.

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.

How to clear fault codes without a scanner? ›

An OBD error code should only be cleared once the vehicle has been repaired and fully restored to proper working order.

The SPN 23 FMI 31 code indicates that the engine is not receiving the proper amount of fuel. This can be caused by a variety of issues, including a clogged fuel filter, a faulty fuel pump, or a problem with the fuel injectors.

FAILURE MODE IDENTIFIERS (FMI) Now that we have defined MID (The component) and PID (types of data), we can talk about Failure Mode Identifiers (FMI). Every diagnostic trouble code (DTC) that you find will have an FMI.

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.

SPN stands for Suspect Parameter Number. It's a diagnostic trouble code that provides detailed information about specific faults detected by the vehicle's ECU, making it easier to identify and address issues within the vehicle's electronic systems.

This diagnostic is typically the Exhaust Gas Recirculation (EGR) Actuator, Failsafe Mode, Motor On. Check as follows: 1. Check for additional voltage fault codes SPN/168 FMI (any).

SPN 3719/FMI 31 - Silent Code that Logs when the Diesel Particulate Filter Regeneration Lamp is Flashing in "Regen Zone 2." NOTE: This code is informational only and used by service to help understand which dash lights illuminated during normal service.