SPN 926 FMI 5 is the Detroit DD Series diagnostic sheet that explains vehicle power shutdown (open circuit) on GHG14 engines. This code flags a vehicle power shutdown caused by an open in the pin 01 circuit of the Common Powertrain Controller (CPC4) #4 connector. Detroit notes that CPC4 digital outputs share an SPN with certain Motor Control Module (MCM2.1) faults, and that the diesel diagnostic tool distinguishes between the MCM2.1 and the CPC4 when it reads the code. Wiring detail is taken from the OEM schematic literature. This DiagTechPro library page outlines what the 1 page PDF contains before you download it.
SPN 926 FMI 5 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | CPC4 digital output / vehicle power shutdown |
| Fault code (SPN / FMI) | 926 / 5 |
| Fault type | Vehicle power shutdown (open circuit) |
| Emissions platform | GHG14 |
| Source | TruckFaultCodes.com (Copyright © 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI reference)
- Fault description and affected circuit
- Step-by-step troubleshooting procedure
- Parameter configuration and connector checks
- Circuit repair instructions
Applicable truck models and engines
This fault sheet applies to Detroit DD Series engines built to the GHG14 emissions platform. It is used with the Detroit diesel diagnostic tool, and with ServiceLink where module configuration must be confirmed. Detroit publishes these fault codes through TruckFaultCodes.com, and the same SPN can appear on more than one module, so confirm the reading before ordering parts. For engine coverage and official service literature, see the Detroit official support site.
Who needs the SPN 926 FMI 5 sheet
Fleet technicians and Detroit-certified workshops troubleshooting this CPC4 digital output fault need this sheet to follow the correct checks instead of guessing at parts. The sheet suits technicians who need to confirm whether the reading belongs to the CPC4 digital output before repairing the pin 01 circuit.
The complete 1 page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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