This DEF metering flush procedure note explains Detroit information code SPN 4335 / FMI 14 on EPA10 engines, a silent fault with no dash lamps illuminated. It indicates that the Aftertreatment Control Module (ACM2) will initiate a flush of the DEF metering unit.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD-Series (DD13, DD15, DD16) and Series 60 (DDEC VI) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 4335 / FMI 14 |
| Fault name | Silent fault (no dash lamps) – metering unit flush |
| Emissions platform | EPA10 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
| Source | TruckFaultCodes.com (© 2017); Detroit Power Service Literature |
DEF metering flush procedure sections covered
The single page is informational and sets the repair order against a related pressure code rather than listing bench tests.
- Fault code header: SPN 4335, FMI 14 (silent, no dash lamps)
- Meaning: ACM2 starts a metering unit flush
- Check whether SPN 3361 / FMI 7 is present as well
- If present, repair SPN 3361 / FMI 7 first
- If only this code is present, no repair is needed; release the unit
Applicable truck models
This note applies to Detroit DD-Series (DD13, DD15 and DD16) and Series 60 DDEC VI engines on the EPA10 aftertreatment platform served by the ACM2 control module. Related dosing chapters are held in Detroit Power Service Literature at the Detroit Diesel official website.
Who needs this DEF metering flush procedure manual
A technician who finds a stored SPN 4335 / FMI 14 needs this metering flush procedure note to see that it is self-initiated, so the truck can be released once SPN 3361 is ruled out.
The full 1-page PDF is available in the DiagTechPro manuals library; a free account is required to download. For workshop reference, Detroit documents the matching component removal and installation steps for SPN 4335 / FMI 14 in Power Service Literature, and technicians should keep the wiring pin numbers shown in this sheet on hand while testing on the bench.
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