SPN 3873 FMI 3 is the Detroit diesel fault code documented in this analog output 02 failed high cpc4 connector 3 troubleshooting guide for DD Series (EPA 2007-Current) engines. This 1-page PDF explains the monitored condition, the enabling parameters and the step-by-step checks a technician follows to confirm and repair the code. It is part of the Detroit DD Series diagnostic trouble code (DTC) library and follows the standard monitored-parameter, enabling-conditions and troubleshooting-step layout used across the Detroit fault-code set.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); cross-referenced for Series 60 (DDEC VI – EPA 2007) |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 3 under SPN 3873 — Analog Output 02 Failed High CPC4 Connector 3 |
| Emissions level | GHG14 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3873 FMI 3 troubleshooting steps
- The code reports analog output 02 failed high on the pin 6 circuit of the Common Powertrain Controller (CPC4) #3 connector.
- Note that CPC4 digital outputs share an SPN with some MCM2.1 faults; the diesel diagnostic tool distinguishes the two.
- Turn the ignition on, connect the diesel diagnostic tool and open the parameters work window.
- Verify that the PGR009 analog-output parameters are set to the specific component (for example, an oil pressure lamp).
- Fix the open circuit on the pin 6 circuit of the CPC4 #3 connector, referring to OEM literature for the wiring schematic.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers analog output 02 on the CPC4 #3 connector pin 6 circuit. The procedure is published in Detroit Power Service Literature and drawn from the Detroit diesel fault-code set; always confirm the latest revision through the official Detroit engine support site.
Who needs this SPN 3873 FMI 3 manual
Fleet technicians and workshop owners use this guide to trace a CPC4 output failed-high condition to an open pin 6 circuit rather than a matching MCM2.1 fault. Reading the full procedure before touching the harness keeps the diagnosis on the documented path and avoids replacing good parts.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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