SPN 520261 FMI 31 is the Detroit Diesel fault-code service sheet that documents a speed-limitation fault triggered by the Powertrain Monitoring Control (PMC) function. It points the technician toward torque-request sources and idle-speed-balance checks. This DiagTechPro library page summarizes what the 2-page PDF contains so a technician can confirm it is the right document before downloading.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); Series 60 DDEC VI (EPA 2007) |
| System / group | GHG14 diagnostic trouble codes |
| Suspect Parameter Number | 520261 |
| Failure Mode Identifier | 31 |
| Source | TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description: external fuel or torque out-of-bounds
- Step 1: bring engine to operating temperature
- Steps 2-3: read Idle Speed Balance values
- Step 4: clear faults and re-evaluate
- Corrective action: reprogram MCM2.1
SPN 520261 FMI 31 diagnostic summary
According to the sheet, this fault may be caused by an external fuel source or a torque request that is out of bounds, so the technician is asked to check the injectors and any alternative fuel sources or add-on devices that could be requesting torque modifications. The procedure brings the engine to operating temperature, then uses the diesel diagnostic tool to read Idle Speed Balance (ISB) values and look for cylinders above 70% or below -70%. If clearing the faults does not stop the code from returning, the sheet directs the technician to reprogram the MCM2.1 with the latest software release.
Applicable Detroit truck models
This fault-code sheet applies to Detroit DD Series engines certified to EPA 2007 and later emissions standards, and it is cross-listed under the Detroit Series 60 (DDEC VI, EPA 2007) diagnostic set. For full engine specifications and support details, see the official Detroit website.
Who needs this SPN 520261 FMI 31 manual
Detroit fleet technicians investigating an unexpected road-speed or power limitation will use this sheet to separate a genuine fuelling fault from an add-on device or software issue before condemning parts.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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