SPN 1077 FMI 6 is the Detroit DD Series fault-code troubleshooting sheet that documents a Quantity Control Valve (QCV) current too high condition on the Motor Control Module engine platform. This 3-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 — SPN 1077 FMI
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 6 under SPN 1077 (EPA07) |
| Source | Detroit fault-code literature via TruckFaultCodes.com, © 2017 |
| Pages | 3 |
| Format | |
| Language | English |
SPN 1077 FMI 6 fault description
This is a circuit-level diagnosis for the quantity control valve. The technician disconnects the QCV and measures resistance across pins 1 and 2 of the solenoid, expecting a value between 1 and 2 ohms; a reading outside that range calls for QCV replacement. If the valve checks good, the Motor Control Module (MCM) 120-pin connector is disconnected and wire resistance from each QCV pin to the matching MCM pin is measured, expecting less than 3 ohms. A test MCM is installed and the engine is brought to operating temperature to confirm the repair.
The SPN 1077 FMI 6 sheet identifies the following likely causes and check points:
- Quantity control valve solenoid resistance out of range
- Open or high-resistance wiring between the QCV and the MCM
- Motor Control Module output fault confirmed with a test MCM
Document table of contents
- Fault code identification
- QCV solenoid resistance measurement
- MCM 120-pin connector wiring checks
- Test MCM verification
Service tools referenced
- J-49120 extension harness
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 6 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 3-page PDF of this procedure is available in the DiagTechPro manuals library; a free account is required to download.
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