SPN 4076 FMI 4 is the Detroit diesel fault code documented in this engine coolant inlet temperature circuit failed low troubleshooting guide for DD Series (EPA 2007-Current) engines. This 1-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 4 under SPN 4076 — Engine Coolant Inlet Temperature Circuit Failed Low |
| Emissions level | All years |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 4076 FMI 4 troubleshooting steps
- This one-page fault indicates the engine coolant inlet temperature circuit has failed low.
- The documented repair is a short to ground between pin 2 of the engine coolant inlet sensor harness connector and pin 80 of the MCM 120-pin connector.
- Repair that harness short, then clear the code and verify the repair with the diagnostic tool.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers the engine coolant inlet temperature harness between the sensor and the MCM. 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 4 manual
Fleet technicians and workshop owners use this guide to go straight to the documented short-to-ground harness repair for a circuit-low coolant fault. 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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