DPF outlet temperature shift is the Detroit DD Series (EPA 2007-current) diagnostic fault sheet for the impossible temperature shift on the DPF outlet temperature sensor condition on the DPF outlet temperature sensor circuit. It identifies an intermittent wiring concern as the likely cause, then walks through the All Voltages service routine, wiggle-testing pin 115 (T_DPF OUT), measuring sensor resistance, and drag-testing terminals from the sensor through the MCM 120-pin connector, with vertical and horizontal Aftertreatment Device wiring diagrams for reference. 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.
DPF outlet temperature shift 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 | EPA07 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Pages | 3 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 3246, FMI 8
- Impossible temperature shift on the DPF outlet sensor
- All Voltages service routine and wiggle test
- Sensor resistance measurement
- Drag-testing terminals to the MCM 120-pin connector
- Aftertreatment Device wiring diagrams
Applicable truck models
This impossible temperature shift on the DPF outlet temperature sensor procedure applies to Detroit DD13, DD15 and DD16 engines built on the DD Series (EPA 2007-current) aftertreatment platform (EPA07 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 DPF outlet temperature shift 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.
Related manuals library
