SPN 4364 FMI 18 is the Detroit Diesel diagnostic trouble code set when SCR NOx conversion efficiency reads 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 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 18 table of contents
Diagnosis starts by repairing any DEF quality code (SPN 3364) first, then checking DEF concentration with a refractometer from DEF Test Kit W060589001900 – it must read between 28 and 36%. DEF pressure is compared to ambient (baro) within 4.3 PSI, the supply and air lines are checked for kinks and leaks, and a DEF quantity test must dispense 44-59 mL (or 102-138 mL depending on tool version). A parked regeneration then confirms whether the conversion reading rises and stays above 70% (0.70).
- Fault code header and description (enabling conditions)
- Troubleshooting steps 1 to 16
- DEF quality, pressure and quantity checks
- Charted parameters (engine speed, SCR in/out temperature, NOx sensors)
- Parked regeneration verification and log-file escalation
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR catalyst and DEF dosing system that controls NOx conversion. The SPN 4364 FMI 18 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 18 manual
It targets aftertreatment technicians diagnosing low NOx conversion on EPA10 Detroit DD Series trucks. The measured DEF concentration, pressure and dosing-volume windows turn a vague efficiency code into a checklist of pass and fail values.
The full 4-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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