SPN 667 FMI 3 is the Detroit DD Series diagnostic fault code that identifies Starter pin – short to power on the pin 18 circuit of the CPC4 #1 connector. This DiagTechPro reference summarizes the official 1-page Detroit diagnostic sheet so a technician can confirm the condition before opening the truck, and it links to the full downloadable PDF.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) diesel engines |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault condition | Starter pin – short to power on the pin 18 circuit of the CPC4 #1 connector |
| Published source | TruckFaultCodes.com, Copyright © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 667 FMI 3 diagnostic overview
This one-page Detroit sheet reports a starter pin short to power on the pin 18 circuit of the CPC4 #1 connector. Because the Common Powertrain Controller (CPC4) digital outputs share the same number as some Motor Control Module (MCM2.1) faults, the diesel diagnostic tool is used to confirm the fault is on the CPC4 side before repair. The document refers the technician to Original Equipment Manufacturer (OEM) literature for the wiring schematic.
Document table of contents
- Fault code identification and description
- Note: CPC4 digital outputs versus MCM2.1 faults
- OEM wiring schematic reference
Applicable truck models covered
This diagnostic applies to Detroit DD Series (EPA 2007-Current) engines using the CPC4 controller, and is also cross-listed under the Series 60 (DDEC VI – EPA 2007) DTC group. It covers the starter pin output on the CPC4 #1 connector. For the OEM wiring schematics referenced in this procedure, see the official Detroit engine manufacturer site.
Who needs the SPN 667 FMI 3 manual
Workshop technicians and fleet owners using the diesel diagnostic tool to read Detroit fault codes and test the CPC4 #1 connector and Motor Control Module wiring will need this sheet. The full step-by-step PDF is available in the DiagTechPro manuals library, and a free account is required to download it.
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