The SPN 94 FMI 3 document is a Detroit DD Series diagnostic trouble code guide covering the fuel compensation pressure (FCP) sensor circuit failed high condition and its step-by-step troubleshooting. This 2-page PDF is compiled from the TruckFaultCodes.com Detroit fault codes reference (© 2017) for the DD Series (EPA 2007-Current) / DTCs set. It is written for workshop diagnostics rather than general reading.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current); Detroit Series 60 (DDEC VI – EPA 2007) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic trouble code | SPN 94/FMI 3 — Fuel Compensation Pressure Sensor Circuit Failed High |
| Publication no. | Not stated (TruckFaultCodes.com DTC reference) |
| Year / Revision | © 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 94 FMI 3 document sections
- Fault code identification: SPN 94/FMI 3 — FCP sensor circuit failed high
- Checking for multiple codes (SPN 100/FMI 3, SPN 4077/FMI 3, SPN 4407/FMI 3)
- Short-to-power repairs at MCM 120-pin connector pins 82 and 104
- Disconnecting the FCP sensor and MCM 120-pin connector
- Resistance measurement across the sensor connector pins
Applicable truck models covered
The SPN 94 FMI 3 fault applies to the models below. This procedure covers Detroit DD Series (EPA 2007-Current); Detroit Series 60 (DDEC VI – EPA 2007) engines equipped with the Motor Control Module. The steps reference the systems named in the extract only — FCP sensor components, harness connectors and, where present, the MCM 120-pin connector. Confirm engine and emissions configuration against the vehicle build before ordering parts; verify current procedures on the Detroit Diesel official site.
Who needs this 94 FMI 3 manual
This reference suits drivability technicians and workshop owners tracing low-side and compensation fuel pressure sensor circuits. Every troubleshooting step and decision branch from the original PDF is preserved so the on-vehicle diagnosis can be followed in sequence. Use it alongside a Detroit-compatible scan tool such as DDDL or DDRS.
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