SPN 111 FMI 3 is a Detroit™ coolant-level sensor diagnostic fault code, and this 2-page Detroit DD Series PDF documents the “Circuit Failed High” condition in full. This code reports the engine coolant level sensor circuit failed high, i.e. an open circuit. Diagnosis measures ECL sensor resistance, then key-on voltage at the sensor connector and at the CPC #3 connector to locate an open or a short. The summary below sets out the official causes, tools and troubleshooting order so a technician can verify the code before downloading the complete manual.
Official document details
| Brand | Detroit |
| Model coverage | DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication no. | Not printed on sheet (Detroit™ via TruckFaultCodes.com, © 2017) |
| Year / Revision | 2017 |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
SPN 111 FMI 3 document contents
- Fault code identification (SPN and FMI)
- Multiple-code check
- ECL sensor resistance measurement
- Key-on voltage checks at sensor and CPC #3
- Open or short repair and escalation
Applicable truck models
The procedure applies to Detroit DD Series diesel engines across all model years using an Engine Coolant Level sensor and Common Powertrain Controller #3. A digital multimeter and the diagnostic tool are required. For factory service data, wiring diagrams and bulletins beyond this fault-code sheet, consult the official Detroit Diesel support site.
Who needs this SPN 111 FMI 3 manual
Technicians chasing a failed-high coolant-level circuit on a Detroit engine need this sheet to decide between a bad sensor and an open harness. It documents the resistance and voltage thresholds used at each step.
The routine has you measure ECL sensor resistance, replace the sensor if it is open, then check key-on voltage at the sensor and CPC #3 connector to repair the open or short, escalating to the Customer Support Center if unresolved.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download it. Every document in the library is indexed by suspect parameter number and failure mode identifier, so you can cross-reference related Detroit DD Series fault codes without leaving the page.
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