The 3250 FMI 4 EPA07 fault code file is a Detroit EPA07 diagnostic sheet covering a Diesel Oxidation Catalyst (DOC) outlet temperature circuit failed low 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 3250-4. 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 3250-4, emission level EPA07 |
| Fault name | DOC Outlet Temperature Circuit Failed Low |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
3250 FMI 4 EPA07 fault summary
It isolates a circuit-failed-low fault with a sequence of resistance measurements across the DOC outlet sensor pins and to ground, pointing to a harness short or a failed sensor. 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.
- Disconnecting the DOC outlet sensor and MCM 120-pin connector
- Resistance across sensor pins 1 and 2
- Resistance from pin 1 to ground
- Resistance from pin 2 to ground
- Repairing the short or replacing the sensor
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 3250 FMI 4 EPA07 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.
Related manuals library
