SPN 1077 FMI 5 is the Detroit DD Series fault-code troubleshooting sheet that documents a Quantity Control Valve error with current too low, illuminating the MIL and CEL lamps and applying a 25% engine derate on the Motor Control Module engine platform. This 2-page reference reproduces the fault-code identification and the factory decision tree so a technician can diagnose the concern before replacing parts.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 5 under SPN 1077 (ALL YEARS) |
| Source | Detroit fault-code literature via TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| Format | |
| Language | English |
SPN 1077 FMI 5 fault description
The sheet lists the monitored parameter as the quantity control valve under rail-pressure closed-loop control, with the code setting when current falls under 200 mA for about two seconds. The technician disconnects the quantity control valve and measures resistance across pins 1 and 2; a reading greater than 2 ohms calls for valve replacement. If the valve is within range, the Motor Control Module (MCM) 120-pin connector is disconnected and resistance is measured from each MCM pin to the matching valve pin, resolving to either an MCM replacement or a repair of the open circuit in the wiring.
The SPN 1077 FMI 5 sheet identifies the following likely causes and check points:
- Quantity control valve solenoid resistance above 2 ohms
- Open circuit between an MCM pin and the valve
- MIL and CEL illuminated with a 25% engine derate
Document table of contents
- Description and monitored conditions
- Quantity control valve resistance check
- MCM 120-pin connector wiring checks
- Valve or MCM replacement
Applicable truck models
This troubleshooting sheet applies to Detroit DD Series engines built from EPA 2007 to current that use the Motor Control Module (MCM) and Common Powertrain Controller architecture. Confirm the engine’s emissions family and calibration against the manufacturer’s official documentation at the Detroit engine website before repairs.
Who needs this SPN 1077 FMI 5 manual
Heavy-duty diesel technicians, fleet shops and mobile mechanics who retrieve this code on a Detroit DD engine need this manual to follow the factory decision tree instead of guessing. It is written for anyone using DDDL or an equivalent diesel diagnostic tool who wants the exact test values before condemning a component.
The full 2-page PDF of this procedure is available in the DiagTechPro manuals library; a free account is required to download.
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