SPN 4076 FMI 3 is the Detroit diesel fault code documented in this engine coolant inlet temperature circuit failed high troubleshooting guide for DD Series (EPA 2007-Current) engines. This 2-page PDF explains the monitored condition, the enabling parameters and the step-by-step checks a technician follows to confirm and repair the code. It is part of the Detroit DD Series diagnostic trouble code (DTC) library and follows the standard monitored-parameter, enabling-conditions and troubleshooting-step layout used across the Detroit fault-code set.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); cross-referenced for Series 60 (DDEC VI – EPA 2007) |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 3 under SPN 4076 — Engine Coolant Inlet Temperature Circuit Failed High |
| Emissions level | All years |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 4076 FMI 3 troubleshooting steps
- Check for multiple codes across the coolant and temperature circuits before isolating this fault.
- Disconnect the engine coolant inlet temperature sensor, turn the ignition on and measure the voltage across pins 1 and 2.
- Voltage of 2.8 to 3 volts means replace the sensor; lower voltage sends you to the harness checks.
- Measure between pin 2 and ground and repair the wire to MCM 120-pin connector pin 80 or pin 55 as indicated.
- If voltage is above 3 volts, repair the short to power on MCM pins 77, 80, 108 or 110, or repair the open in the shared temperature-sensor supply.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers the engine coolant inlet temperature sensor and its MCM wiring. The procedure is published in Detroit Power Service Literature and drawn from the Detroit diesel fault-code set; always confirm the latest revision through the official Detroit engine support site.
Who needs this SPN 4076 FMI 3 manual
Fleet technicians and workshop owners use this guide to trace a circuit-high coolant fault across the sensor, harness and MCM connector pins. Reading the full procedure before touching the harness keeps the diagnosis on the documented path and avoids replacing good parts.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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