SPN 3868 FMI 3 is the Detroit DD Series fault code sheet for Digital Input 4 03, which is flagged as failed high (an open circuit) on pin 3 of the Common Powertrain Controller (CPC4) #4 connector. This one-page troubleshooting document, published on TruckFaultCodes.com, walks a technician through checking the CPC4 digital input parameters with the diesel diagnostic tool before repairing the wiring. Use it to confirm whether the code points to an open circuit (failed high) in the harness or to a mis-configured parameter.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series (EPA 2007-Current) and Series 60 (DDEC VI, EPA 2007) |
| System / Group | DTCs — CPC4 digital inputs |
| Fault code | SPN 3868, FMI 3 |
| Year / Revision | Copyright 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code header — Digital Input 4 03, pin 3 of the CPC4 #4 connector
- Note on the shared SPN between CPC4 digital outputs and Motor Control Module (MCM2.1) faults
- Troubleshooting steps 1 to 6
- Parameter verification in PGR013 digital inputs
- Wiring repair and OEM schematic reference
Applicable truck models for SPN 3868 FMI 3
The procedure covers trucks running the Detroit DD Series (EPA 2007 to current) and the Series 60 with DDEC VI, where the CPC4 manages powertrain digital inputs such as a hood tilt switch. The sheet notes that CPC4 digital outputs share an SPN with some MCM2.1 faults, so the diesel diagnostic tool is needed to tell the two modules apart during diagnosis. Complete pinouts and wiring schematics stay in the Original Equipment Manufacturer literature; see the official Detroit powertrain site for engine and controller references.
Who needs this SPN 3868 FMI 3 manual
Fleet technicians and workshop owners chasing a 3868 FMI 3 alarm use this sheet to first verify the PGR013 digital input parameters, and then to fix the open circuit on the pin 3 circuit of the CPC4 #4 connector once the configuration checks out. It keeps the repair anchored to the six documented steps instead of guesswork on live wiring.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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