SPN 2630 FMI 4 is the Detroit DD-Series diagnostic fault code document for the intake air temperature circuit failed low event, published on TruckFaultCodes.com (copyright 2017) and archived as a 1-page PDF in the DiagTechPro library. The document identifies a failed-low intake air temperature circuit caused by a short to ground in the sensor harness back to the Motor Control Module (MCM).
SPN 2630 FMI 4 document details
| Brand | Detroit |
| Model coverage | Detroit DD-Series (DD13, DD15 and DD16), EPA 2007 and later |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code (SPN) | 2630 |
| Failure mode (FMI) | 4 |
| Emissions calibration | EPA07 / GHG14 |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 1 |
| File size | 0.20 MB |
| Format | |
| Language | English |
The page records the official identifiers so a technician can confirm the exact code and calibration against the diesel diagnostic tool before starting any repair.
Document table of contents
- Fault code identification (SPN 2630 / FMI 4)
- Intake air temperature circuit failed low
- Affected wiring (sensor pin 2 to MCM pin 119)
- Repair direction for the short to ground
This concise, single-page description tells the technician to repair the short to ground between pin 2 of the intake air temperature sensor harness connector and pin 119 of the Motor Control Module 120-pin connector. Because the document points directly at the wiring rather than the sensor, the repair focuses on locating and correcting the shorted conductor in that segment of the harness, then clearing the code and confirming the reading returns to a plausible value before the vehicle is released.
Applicable truck models
This document applies to Detroit DD-Series diesel engines in the EPA 2007-and-later range, typically the DD13, DD15 and DD16 as covered by the EPA07 / GHG14 calibration shown on the file. Confirm the engine calibration and connector layout for your chassis on the official Detroit engine site before ordering parts.
Who needs this SPN 2630 FMI 4 manual
Auto-electricians tracing a shorted intake-air temperature circuit on an EPA07 Detroit DD-Series engine will use this page to jump straight to the affected harness segment.
The complete 1-page PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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