SPN 3517 FMI 9 is documented in this Detroit DD Series fault code reference PDF, which covers the DEF Tank Signal Not Available via CAN condition on Detroit engines. The 2-page document lists the fault description, the step-by-step troubleshooting sequence and the connector measurements a technician uses to confirm the repair.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) GHG14 engines using the ACM2.1 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic code | FMI 9 / SPN 3517 |
| Year / revision | Source dated 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN 3517, FMI 9
- DEF tank signal not available via CAN
- ACM2.1 reprogramming verification
- DEF tank header harness resistance checks
- ACM2.1 terminating resistor measurement
- Harness repair and header replacement
Applicable truck models and engines
This fault code applies to Detroit DD Series (EPA 2007-Current) GHG14 engines using the ACM2.1, and the DiagTechPro library also files it under the Series 60 (DDEC VI, EPA 2007) DTC set. The diagnostic references the Aftertreatment Control Module (ACM2.1) used on these Detroit powertrains. See the manufacturer’s Detroit official website for current engine specifications and dealer support.
SPN 3517 FMI 9 troubleshooting overview
The technician first confirms whether the ACM2.1 was recently reprogrammed, then powers down all modules for five minutes and rechecks for active faults. Resistance across pins 1 and 2 of the Diesel Exhaust Fluid (DEF) tank header harness is measured, with branches for values above 80 ohms and between 40 and 80 ohms. The ACM2.1 120-pin connector internal terminating resistor is checked across pins 48 and 49 and to engine ground to separate a shorted DEF CAN harness, a failed ACM2.1 and a faulty DEF tank header.
Who needs this SPN 3517 FMI 9 manual
Detroit-certified technicians, independent truck repair shops and fleet maintenance teams will use this reference to follow the factory diagnostic sequence with a diesel diagnostic tool before replacing any control module or sensor.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it, alongside the related Detroit Power Service Literature.
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