SPN 1077 FMI 4 is the Detroit DD Series fault-code troubleshooting sheet that documents a Quantity Control Valve (QCV) circuit failed low condition 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 4 under SPN 1077 (GHG14) |
| Source | Detroit fault-code literature via TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| Format | |
| Language | English |
SPN 1077 FMI 4 fault description
This two-page sheet targets a short-to-ground in the quantity control valve circuit. The technician disconnects the QCV connector and inspects for bent, spread or corroded pins, then repeats the inspection at the Motor Control Module (MCM2.1) 120-pin connector. Resistance is measured from each QCV pin to battery ground, expecting more than 10K ohms; a lower reading identifies a short to ground in the wiring between the QCV and the matching MCM2.1 pin, which is then repaired. If both pins pass, the quantity control valve is replaced and the repair is verified.
The SPN 1077 FMI 4 sheet identifies the following likely causes and check points:
- Bent, spread or corroded pins at the QCV or MCM2.1 connector
- Short to ground between a QCV pin and its MCM2.1 pin
- Failed quantity control valve
Document table of contents
- Fault code identification
- QCV and MCM2.1 connector inspection
- Resistance-to-ground measurements
- Quantity control valve 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 4 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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