SPN 2630 FMI 3 is the Detroit DD-Series diagnostic fault code document for the charge air cooler outlet temperature circuit failed high event, published on TruckFaultCodes.com (copyright 2017) and archived as a 4-page PDF in the DiagTechPro library. The document is a four-page diagnostic for a failed-high charge air cooler outlet temperature circuit, noting that this sensor is called the intake air temperature sensor in some literature.
SPN 2630 FMI 3 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) | 3 |
| Emissions calibration | All model years |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 4 |
| File size | 0.23 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 3)
- CAC outlet temperature circuit failed high
- Note: CAC outlet versus intake air temperature naming
- Steps 1 to 8 – Sensor, harness and voltage checks
- Steps 9 to 15 – MCM disconnect and resistance measurements
- Step 16 – Verification and Customer Support Center contact
The procedure connects the diagnostic tool, checks whether related codes are active, then disconnects the CAC outlet temperature sensor and inspects the harness for spread pins, corrosion or damaged wiring. Voltage between pins 1 and 2 is compared against 3.5-volt and 2.8-to-3.4-volt bands to decide between a wiring short, an open circuit or sensor replacement. Later steps disconnect the MCM 120-pin connector and measure resistance to pin 52 and the intake manifold temperature sensor, repairing the shared wire where resistance is high, then verifying the repair before releasing the vehicle.
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 All model years 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 3 manual
Workshop technicians facing a high charge-air-cooler outlet temperature reading on a Detroit DD-Series engine will use this page to test both the sensor and the shared MCM wiring.
The complete 4-page PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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