SPN 111 FMI 6 is a Detroit™ coolant-level sensor diagnostic fault code, and this 2-page Detroit DD Series PDF documents the “Coolant Level Sensor Circuit Failed Low” condition in full. This code reports the engine coolant level sensor circuit failed low, i.e. a short in the wiring. Diagnosis disconnects the ECL sensor and the CPC #3 21-pin connector and measures resistance to find a short between wires or to ground. 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 6 document contents
- Fault code identification (SPN and FMI)
- Multiple-code check
- ECL sensor and CPC #3 disconnect
- Resistance measurements across pins and to ground
- Short-circuit repair or support escalation
Applicable truck models
The procedure applies to Detroit DD Series diesel engines on the GHG14 emissions platform 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 6 manual
Electrical technicians chasing a coolant-level sensor circuit fault on a Detroit engine need this sheet to locate a short in the harness rather than replacing the sensor. It documents the resistance thresholds to test against.
The routine has you disconnect the ECL sensor and CPC #3 connector, then measure resistance across the sensor pins and from each pin to ground; a low reading pinpoints the short circuit to repair, otherwise you escalate to the Customer Support Center.
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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