SPN 2630 FMI 20 is the Detroit DD-Series diagnostic fault code document for the charge air outlet temperature drift, low box event, published on TruckFaultCodes.com (copyright 2017) and archived as a 2-page PDF in the DiagTechPro library. The document diagnoses a low-box drift on the charge air outlet temperature signal, following the same harness and voltage checks to the Motor Control Module (MCM) on an EPA07 engine.
SPN 2630 FMI 20 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) | 20 |
| Emissions calibration | EPA07 |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 2 |
| File size | 0.22 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 20)
- Charge air outlet temperature drift (low box)
- Step 1 – Air intake and charge air cooler inspection
- Steps 2 to 3 – Sensor and connector inspection
- Steps 4 to 5 – Voltage measurement at the sensor
- EPA07 charge air cooler outlet sensor removal reference
The procedure inspects the air intake system and charge air cooler for leaks, cracks or plugging, then disconnects the charge air outlet temperature sensor and examines the harness connector for bent, spread or corroded pins. With the ignition on, the technician measures the voltage between pins 1 and 2 on the harness side against a 2.75-volt threshold. A reading above the threshold calls for replacing the EPA07 charge air cooler outlet air temperature sensor; otherwise the wires to pins 52 and 119 of the MCM 120-pin connector are repaired.
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 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 20 manual
Diesel technicians working a low-side charge-air temperature drift on an EPA07 Detroit DD-Series engine will use this page to confirm sensor wiring before replacement.
The complete 2-page PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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