SPN 3246 FMI 8 is the Detroit DD Series (EPA 2007-current) diagnostic fault sheet for the DPF outlet temperature signal spike condition on the DPF outlet temperature sensor circuit. It attributes the signal spike to an intermittent wiring concern and guides the technician through wiggle-testing the DPF outlet temperature signal on pin 97, measuring sensor resistance, and drag-testing every terminal between the sensor and the Aftertreatment Control Module. The sheet is written for heavy-duty technicians who pull this diagnostic trouble code with a diesel diagnostic tool and need the confirmed factory step order rather than guesswork.
SPN 3246 FMI 8 document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD13, DD15 and DD16 — DD Series (EPA 2007-current) |
| System / Group | DPF outlet temperature sensor / DTCs |
| Fault code | SPN 3246 / FMI 8 |
| Emissions platform | EPA10/GHG14 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 3246, FMI 8
- DPF outlet temperature — signal spike note
- Wiggle-testing for abnormal voltage spikes
- Sensor resistance measurement
- Drag-testing harness terminals to the ACM
Applicable truck models
This DPF outlet temperature signal spike procedure applies to Detroit DD13, DD15 and DD16 engines built on the DD Series (EPA 2007-current) aftertreatment platform (EPA10/GHG14 calibrations) and is cross-listed for Series 60 DDEC VI (EPA 2007) installations that share the same DPF outlet temperature sensor. Removal and installation callouts refer to Detroit Power Service Literature, and the Detroit Customer Support Center (800-445-1980) is the authoritative escalation point. Full model and engine coverage is confirmed on the Detroit Diesel official website.
Who needs this SPN 3246 FMI 8 manual
Workshop owners, mobile diesel technicians and fleet maintenance teams reach for this manual the moment a scan tool reports SPN 3246/FMI 8. It keeps the diagnosis on the manufacturer’s confirmed path, which shortens repair time and avoids replacing a good DPF outlet temperature sensor. The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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