What does low NOx conversion mean?

What does low NOx conversion mean?

Description. This code sets when the ACM detects that the SCR NOx Conversion efficiency is low. The measurement for this sensor happens by measuring the inlet and outlet NOx sensors to determine the efficiency rate. If this falls below the calculated threshold, then this fault code gets triggered.

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 is code SPN 4364?

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.

What is NOx conversion?

The most common way to reduce diesel engine NOx out emissions is to use SCR. Due to a catalytic reaction within the catalyst, NOx is converted nominally into Nitrogen and Water. Currently, the evaporative process is enhanced by aggressive mixer plates and long flow paths.

What is SCR efficiency?

SCR technology is one of the most cost-effective and fuel-efficient technologies available to help reduce diesel engine emissions. SCR can reduce NOx emissions up to 90 percent while simultaneously reducing HC and CO emissions by 50-90 percent, and PM emissions by 30-50 percent.

What FMI 18?

FMI: 1/18. SRT: REASON: Coolant Level – Data Valid but Below Normal Operating Range – Moderately Severe Level. Low engine coolant level detected.

What does SCR stand for?

Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system used in diesel engines.

How to troubleshoot selective catalyst reduction NOx ( DD15 )?

Disconnect DEF doser injector connector and perform a Low temp regen using DDDL. Monitor inlet & outlet NOx sensor readings (PPM) make sure they are within 50ppm, if not replace the sensor with most inaccurate/erratic reading. After all basic checks have been performed.

When to get a new Cascadia DD15 engine?

Discussion in ‘ Freightliner Forum ‘ started by janboskit, Jun 28, 2016 . See above. Same issue on my 2012 Cascadia DD15 engine. In short, eventually needed a new onebox. Got it while it was still in warrantee. 600k on mine. Every month 400 people find a job with the help of TruckersReport. Please Select…

What does fault code SPN 4364 FMI 18 mean?

DD13 with 3364 FMI 2, Spn 4364 FMI 18, 1548 FMI 4. Wondering DD13 with 3364 FMI 2, Spn 4364 FMI 18, 1548 FMI 4. Wondering if I could get the troubleshooting steps for these codes … read more Vocational, Technical or Tra… 2012 Freghtliner Cascadia with DD13 DEF tank is full w/Stop & check engine light on while DEF light blinking.

What does’scr NOx conversion efficiency low’mean on Detroit Diesel?

What does ‘SCR NOx conversion efficiency low’ mean on Detroit Diesel DD13, DD15, DD16? Fault codes associated with Selective Catalyst Reduction ( SCR) NOx efficiency low are the most dreaded codes you will find on the Detroit Diesel application and can drive your costs high.

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