SPN 926 FMI 4 is the Detroit DD Series diagnostic sheet that explains digital output 4 01 short to ground on GHG14 engines. This code is set by a short to ground on the pin 01 circuit of the Common Powertrain Controller (CPC4) #4 connector, reported as digital output 4 01. Detroit notes CPC4 digital outputs share an SPN with certain Motor Control Module (MCM2.1) faults, so the diesel diagnostic tool distinguishes the two. The sheet has the technician connect the tool, open the parameters work window and confirm the PGR035 digital-output parameters before repairing the short. This DiagTechPro library page outlines what the 1 page PDF contains before you download it.
SPN 926 FMI 4 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | CPC4 digital output 4 01 |
| Fault code (SPN / FMI) | 926 / 4 |
| Fault type | Digital output 4 01 short to ground |
| 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 4 sheet
Fleet technicians and Detroit-certified workshops troubleshooting this CPC4 digital output 4 01 fault need this sheet to follow the correct checks instead of guessing at parts. It suits technicians who must verify parameter configuration in PGR035 before condemning the pin 01 circuit wiring.
The complete 1 page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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