SPN 110 FMI 16 is a Detroit™ coolant-temperature diagnostic fault code, and this 2-page Detroit DD Series PDF documents the “Coolant Temperature High Alarm” condition in full. This code is a high coolant temperature alarm. After ruling out coolant temperature circuit codes, the procedure compares inlet and outlet temperatures cold and then checks the cooling system for the cause of the overheat. 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 | 0.2 MB |
| Format | |
| Language | English |
SPN 110 FMI 16 document contents
- Fault code identification (SPN and FMI)
- Multiple-code check (SPN 110/FMI 3 and 4)
- Cold inlet vs outlet temperature comparison
- Coolant, thermostat and radiator checks
- Fan, shroud and hose inspection
Applicable truck models
The procedure applies to Detroit DD Series diesel engines on the GHG14 emissions platform using coolant inlet and outlet temperature sensors. The diagnostic tool and basic cooling-system tools 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 110 FMI 16 manual
Technicians responding to a high-temperature alarm on a Detroit engine need this sheet to separate a sensor fault from a real cooling failure. It provides a structured cooling-system inspection list.
The routine has you repair related temperature codes first, compare inlet and outlet temperatures cold, then check coolant condition, thermostat operation, radiator and charge air cooler blockage, fan belt, shroud position, hoses and viscous fan operation.
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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