What does code SPN 4364 mean?

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 good NOx conversion efficiency?

How to Get an SCR NOx efficiency above 70% if it’s below 70%? Inlet and outlet sensors calculate the efficiency, so make sure both sensors are good. Make sure your DPF system is operating normally.

How do you calculate NOx conversion efficiency?

The method of claim 5 , wherein the SCR conversion efficiency f is calculated from an equation f=px+q(1−x), wherein p is the NOx conversion value in the absorption mode of the NH3, q is the NOx conversion vale in the release mode of the NH3, and x is the reference control signal of the dosing module.

What are normal NOx sensor readings?

With no DEF doser operation both inlet and outlet should read close to each other. When the injector is activated outlet nox should drop at least 70%. Normally under steady cruise the nox sensor on a duramax or ISB cummins is around 200-300 ppm.

What are SPN codes?

Military Separation Program Numbers (SPN Codes) define the reason a discharge or separation was granted. SPN Codes were replaced by alpha-numeric separation codes but can still be found on many older DD-214s.

What should outlet NOx be?

– Inlet and Outlet NOx values should be within 40 parts per million (ppm) of one another just before the engine shuts down.

What is a NOx conversion test?

A NOx conversion test only checks NOx sensor function. The test compares the. NOTE: readings of the two sensors as the engine cycles through multiple conditions to confirm they.

How do I reset my Cummins NOx sensor?

The procedure:

1. Run the Aftertreatment Maintenance command.
2. Run the NOx Reset command.
3. Perform a regen (Recommended, not required)
4. Codes will go inactive and can be cleared.

What should a NOx sensor read at idle?

When the injector is activated outlet nox should drop at least 70%. Normally under steady cruise the nox sensor on a duramax or ISB cummins is around 200-300 ppm.