The SPN 3250 FMI 2 fault code file is a Detroit EPA07 diagnostic sheet covering a Diesel Oxidation Catalyst (DOC) temperature sensor plausibility error on DD Series engines. Compiled by TruckFaultCodes.com (© 2017) from Detroit Power Service Literature, this 9-page PDF gives technicians the exact troubleshooting order for DTC 3250-2. It is a field reference, not a substitute for the full factory manuals.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) — DTCs |
| Diagnostic code | DTC 3250-2, emission level EPA07 |
| Fault name | DOC Temperature Sensor Plausibility Error |
| Pages | 9 |
| File size | 0.4 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
SPN 3250 FMI 2 fault summary
It resolves a DOC temperature sensor plausibility error by comparing the DOC inlet, DOC outlet and DPF outlet readings, checking pressure-sensor voltages, and inspecting the DPF for contamination. Every step is laid out as a Yes/No decision branch, so you can follow the same path a Detroit dealer technician would without guessing.
- Comparing DOC inlet, outlet and DPF outlet temperatures
- Voltage service routine and harness wiggle test
- DPF inlet and outlet pressure sensor voltage checks
- Removing the aftertreatment device
- Contamination inspection and DOC or DPF replacement
Applicable truck models and engines
This procedure applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family. The EPA07 procedure is built around the Motor Control Module (MCM) and its 120-pin connector. For engine specifications and dealer support, see the official Detroit engine support site.
Who needs this SPN 3250 FMI 2 manual
Fleet technicians, mobile diesel mechanics and DD Series owners diagnosing this code with a diesel diagnostic tool such as DDDL or DDRS will find the exact step order, pin numbers and pass/fail limits they need. Keep it beside the truck during the repair.
The complete 9-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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