SPN 2623 FMI 2 is the Detroit DD-Series diagnostic fault code document for the difference between channel 1 and channel 2 value over limit event, published on TruckFaultCodes.com (copyright 2017) and archived as a 2-page PDF in the DiagTechPro library. The document covers an accelerator pedal fault set when the difference between channel 1 and channel 2 values exceeds the allowed limit, monitored through the pedal position voltages.
SPN 2623 FMI 2 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) | 2623 |
| Failure mode (FMI) | 2 |
| Emissions calibration | GHG14 |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 2 |
| File size | 0.29 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 2623 / FMI 2)
- Channel 1 to channel 2 difference over limit
- Steps 1 to 2 – Ignition on and other-fault check
- Steps 3 to 4 – Monitor pedal position voltage sweep
- Steps 5 to 8 – Clear, re-test and vibration check
- Accelerator pedal replacement and CSC contact
With the ignition on and other codes cleared, the technician monitors accelerator pedal position voltages under the Instrumentation tab and cycles the pedal slowly through its full sweep, watching for a smooth voltage change. If the sweep is not smooth the pedal is replaced; if it is smooth, codes are cleared and the fault is re-checked. Later steps gently wiggle the pedal and harness to simulate road vibration, rerun the voltage sweep, and either capture a log file for the Detroit Customer Support Center or replace the accelerator pedal.
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 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 2623 FMI 2 manual
Technicians chasing an intermittent accelerator pedal complaint on a Detroit DD-Series truck will use this page to test the pedal sweep and vibration response 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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