SPN 4364 FMI 1 is the Detroit Diesel diagnostic trouble code set when SCR NOx conversion efficiency reads very low on DD Series (EPA 2007-current) engines. This 4-page troubleshooting sheet lists the fault definition, the relevant monitor or note data, and a numbered diagnostic routine that ends in the correct wiring or component repair. It is drawn from TruckFaultCodes.com (© 2017) and applies to the EPA10 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — SCR conversion efficiency |
| Suspect parameter (SPN) | SPN 4364 |
| Failure mode (FMI) | SCR NOx conversion efficiency very low |
| Emissions calibration | EPA10 |
| Dash lamps | MIL |
| Verification | parked regeneration |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 4 |
| File size | 0.3 MB |
| Format / language | PDF / English |
SPN 4364 FMI 1 table of contents
As with the related efficiency codes, any DEF quality fault (SPN 3364) is repaired first, then DEF concentration is verified at 28-36% with a refractometer from DEF Test Kit W060589001900. DEF pressure is compared to ambient within 4.3 PSI, lines are inspected, and a DEF quantity test must fall in the 44-59 mL or 102-138 mL window. A parked regeneration then checks that the conversion reading climbs and holds above 70% (0.70); if not, log files are sent to Detroit Customer Support at csc@daimler.com or 800-445-1980.
- Fault code header and description (enabling conditions)
- Troubleshooting steps 1 to 16
- DEF quality, pressure and quantity checks
- Charted parameters and parked regeneration
- Log-file escalation to Detroit Customer Support
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR catalyst and DEF dosing system. The SPN 4364 FMI 1 procedure applies to Detroit DD Series (EPA 2007-current) engines running the EPA10 calibration, and the same code index is cross-referenced under the Detroit Series 60 (DDEC VI, EPA 2007) fault-code set. For engine identification and warranty details, see the Detroit Diesel official site.
Who needs this 4364 FMI 1 manual
It is aimed at technicians facing a very low SCR conversion reading and a possible derate on EPA10 Detroit DD Series engines. The concrete DEF and regeneration targets show whether the catalyst, dosing volume or fluid quality is the limiting factor.
The full 4-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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