SPN 703 FMI 4 is the Detroit DD Series diagnostic fault code that identifies Digital Output 3 09 – short to ground on the pin 9 circuit of the CPC4 #3 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 | Digital Output 3 09 – short to ground on the pin 9 circuit of the CPC4 #3 connector |
| Published source | TruckFaultCodes.com, Copyright © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 703 FMI 4 diagnostic overview
This Detroit sheet covers a short to ground on the pin 9 circuit of the Common Powertrain Controller (CPC4) #3 connector, reported as digital output 3 09. The procedure has the technician turn the ignition on with the engine off, connect the diesel diagnostic tool, open the parameters work window, and confirm that the PGR035 digital output parameters are set to the component being controlled, such as an optimized idle active lamp. If the parameters are correct, the fix is to repair the short to ground on pin 9 of the CPC4 #3 connector using OEM wiring information.
Document table of contents
- Fault code identification
- Note: CPC4 outputs versus MCM2.1 faults
- Troubleshooting steps 1 to 6
- Parameter verification (PGR035 digital outputs)
- OEM wiring schematic reference
Applicable truck models covered
This procedure applies to Detroit DD Series (EPA 2007-Current) engines wired through the CPC4 controller, and the code is also cross-listed under the Series 60 (DDEC VI – EPA 2007) DTC group. It concerns a configurable digital output rather than a fixed sensor, so parameter checks are part of the diagnosis. For the OEM wiring schematics referenced in this procedure, see the official Detroit engine manufacturer site.
Who needs the SPN 703 FMI 4 manual
Workshop technicians and fleet owners using the diesel diagnostic tool to read Detroit fault codes and test the CPC4 #3 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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