The 3250 FMI 3 EPA10 fault code file is a Detroit EPA10 and GHG14 diagnostic sheet covering a Diesel Oxidation Catalyst (DOC) outlet temperature sensor circuit failed high on DD Series engines. Compiled by TruckFaultCodes.com (© 2017) from Detroit Power Service Literature, this 2-page PDF gives technicians the exact troubleshooting order for DTC 3250-3. 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 3250-3, emission level EPA10 and GHG14 |
| Fault name | DOC Outlet Temperature Circuit Failed High |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
3250 FMI 3 EPA10 fault summary
It works a circuit-failed-high condition, measuring sensor resistance and then harness voltages at pins 1 and 2 to locate a short to power or an open to the ACM 120-pin connector. 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.
- Inspecting the sensor connector pins
- DOC outlet temperature resistance test
- Voltage check at pin 2 for a short to power
- Voltage check at pin 1
- Repairing shorts or opens to ACM pins 27 and 73
Applicable truck models and engines
This procedure applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family. The procedure is built around the Aftertreatment Control Module (ACM). For engine specifications and dealer support, see the official Detroit engine support site.
Who needs this 3250 FMI 3 EPA10 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 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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