SPN 2623 FMI 8 is the Detroit DD-Series diagnostic fault code document for the general fault if the channel 2 signal cannot be used event, published on TruckFaultCodes.com (copyright 2017) and archived as a 3-page PDF in the DiagTechPro library. The document is a three-page diagnostic for a general fault raised when the accelerator pedal channel 2 signal cannot be used, testing the pedal harness back to the Common Powertrain Controller (CPC4).
SPN 2623 FMI 8 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) | 8 |
| Emissions calibration | GHG14 |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 3 |
| File size | 0.35 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 8)
- Channel 2 signal cannot be used description
- Steps 1 to 2 – Disconnect accelerator pedal, ignition on
- Steps 3 to 4 – Voltage checks at the pedal harness
- Steps 5 to 7 – Resistance to the CPC4 #4 connector
- Accelerator pedal replacement decision
After disconnecting the accelerator pedal and turning the ignition on, the technician measures the voltage between pins D and E of the pedal harness connector against a 4.5-to-5.5-volt window, then checks pin D to ground. Open circuits are repaired back to pins 2 and 3 of the Common Powertrain Controller (CPC4) #3 connector. The final steps measure resistance between pin F of the pedal harness and pin 14 of the CPC4 #4 connector against a 3-ohm limit, repairing the open wire or replacing the accelerator pedal where the wiring is sound.
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 8 manual
Technicians diagnosing an accelerator pedal channel fault on a Detroit DD-Series truck will use this page to test the pedal wiring and CPC4 connections before replacing the pedal.
The complete 3-page PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
Related manuals library
