SPN 3512 FMI 4 is documented in this Detroit DD Series fault code reference PDF, which covers the 3V Sensor Supply Bank 2 Circuit Failed Low condition on Detroit engines. The 1-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) engines on the EPA10 and GHG14 platforms using the MCM |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic code | FMI 4 / SPN 3512 |
| Year / revision | Source dated 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN 3512, FMI 4
- 3V sensor supply bank 2 failed low
- Monitored parameter and dash lamps
- MCM internal failure diagnosis
- Motor Control Module replacement
Applicable truck models and engines
This fault code applies to Detroit DD Series (EPA 2007-Current) engines on the EPA10 and GHG14 platforms using the MCM, and the DiagTechPro library also files it under the Series 60 (DDEC VI, EPA 2007) DTC set. The diagnostic references the Motor Control Module (MCM) used on these Detroit powertrains. See the manufacturer’s Detroit official website for current engine specifications and dealer support.
SPN 3512 FMI 4 troubleshooting overview
This reference identifies the fault as a Motor Control Module (MCM) internal failure and directs the technician to replace the MCM, referring to the removal procedure for the Motor Control Module. The monitored parameter is the MCM 3V internal power supply, which is always enabled, with a typical two-second duration and the MIL and CEL dash lamps. Verification is performed at engine idle for one minute. Because the failure is internal, the page steers work toward module replacement rather than extended harness diagnostics.
Who needs this SPN 3512 FMI 4 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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