The Detroit TCI temperature sensor troubleshooting sheet documents Detroit fault code SPN 1172 FMI 3, which sets when the turbocharger compressor inlet (TCI) temperature sensor or circuit failed high. This 2-page PDF belongs to the Detroit DD Series (EPA 2007-Current) DTC library and guides a technician through the confirmation and repair sequence for the code. It is drawn from Detroit Power Service Literature and republished by TruckFaultCodes.com (2017).
The steps check for related high-side temperature-sensor codes, then measure the voltage at the sensor to separate a short to power from an open circuit between the sensor and pin 88 of the 120-pin MCM connector, with sensor replacement as the final option.
Detroit TCI temperature sensor document details
| Brand | Detroit |
| Model coverage | DD Series (EPA 2007-Current) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 1172 FMI 3 |
| Source | Detroit Power Service Literature |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Multiple-code check (SPN 3250 / 3242 / 3246)
- TCI temperature sensor disconnection
- Voltage measurement at sensor pin 1
- Short-to-power and open-circuit repair
- Sensor replacement criteria
Applicable truck models
This fault code troubleshooting procedure applies to Detroit DD Series engines built to EPA 2007 and later emissions standards, covering all model years within the DD Series DTC set. Use it alongside a diesel diagnostic tool such as DiagnosticLink or ServiceLink to read live data and confirm the code before any parts are replaced. For engine coverage and official service resources, visit the Detroit Diesel official website.
Who needs this Detroit TCI temperature sensor manual
Fleet technicians, mobile diesel mechanics and workshop owners rely on this reference before opening the SPN 1172 FMI 3 code with a scan tool. Following the documented sequence avoids replacing good parts and clarifies whether the concern lies in wiring, a sensor, or a mechanical component.
The full SPN 1172 FMI 3 PDF is available in the DiagTechPro manuals library; a free account is required to download.
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