SPN 188 FMI 31 is a Detroit DD Series diagnostic trouble code, and this 1-page PDF fault-code sheet documents the “IDLE SPEED OUT OF RANGE” condition together with its monitored parameter, enabling conditions and factory troubleshooting steps. The reference is published on TruckFaultCodes.com (Copyright © 2017) and mirrors the Detroit™ DiagnosticLink flow used by dealer technicians. Use it to confirm the code before you open the harness.
SPN 188 FMI 31 document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | Detroit DD Series engines — DD13, DD15 and DD16 (EPA 2007 to current); also referenced for Series 60 DDEC VI |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 188, FMI 31 — EPA10/GHG14 |
| Fault description | IDLE SPEED OUT OF RANGE |
| Source / Revision | TruckFaultCodes.com, Copyright © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Fault code description and checks
This Detroit fault code sheet identifies the idle speed out of range fault reported by the Motor Control Module (MCM) as SPN 188, FMI 31. The monitored parameter is the Engine RPM. Typical enabling conditions are “Engine RPM = idle”. The affected dash lamps are MIL. Typical duration before the code sets is 10 Seconds. The numbered troubleshooting procedure walks the technician through a sequence of guided checks before any part is replaced. Unresolved cases are escalated to the Detroit™ Customer Support Center at 800-445-1980.
Document table of contents
- Fault code header — SPN and FMI identifiers
- Description — monitored parameter and enabling conditions
- Dash lamp and engine reaction summary
- Step-by-step troubleshooting procedure
- Verification of repair
Applicable truck models
This diagnostic covers Detroit DD13, DD15 and DD16 engines built to EPA 2007 and later emissions standards, as fitted to Freightliner Cascadia and Western Star highway tractors, and it is also cross-referenced for Series 60 engines running DDEC VI. Confirm engine serial and calibration coverage against the current data on Detroit’s official Detroit engine platform website before ordering parts.
Who needs this SPN 188 FMI 31 manual
Fleet technicians, mobile diesel mechanics and workshop owners who pull this code on DiagnosticLink use the sheet to separate a genuine sensor or wiring fault from a false trigger, saving guesswork and unnecessary parts. It is written for hands-on repair, not classroom study.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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