SPN 520310 FMI 3 is the Detroit fault code for Injector Cylinder #6 Needle Control Valve Abnormal Operation (Max) Cold, and this 6-page PDF reproduces the official code description and the full troubleshooting routine. The Motor Control Module (MCM2.1) sets this code from the injector cylinder #6 needle control valve circuit on the rear fuel injector harness, lighting the MIL and CEL and applying a 25% engine derate.
Official document details
| Brand | Detroit |
| Model coverage | DD Series (EPA 2007-current); also Series 60 (DDEC VI) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 520310, FMI 3 |
| Year / Revision | Copyright 2017 (TruckFaultCodes.com) |
| Pages | 6 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI)
- Description and monitored parameter
- Typical enabling conditions, dash lamps and engine reaction
- Check for multiple codes (SPN 168 and 723 first)
- Rear fuel injector harness 14-pin connector inspection
- Injector and harness resistance measurement charts
- MCM2.1 120-pin connector inspection and replacement
Applicable models for SPN 520310 FMI 3
This diagnostic trouble code applies to Detroit DD13, DD15 and DD16 engines built to EPA 2007 and later standards, and the same code appears in the Series 60 (DDEC VI) fault-code set. The procedure works on both two-filter and three-filter fuel systems and references the rear injector wiring harness and the MCM2.1. For engine background and dealer support, see the official Detroit Diesel website.
Who needs this SPN 520310 FMI 3 guide
Technicians diagnosing a rough cold start, misfire or power derate on cylinder #6 rely on this guide to check harness pins, measure injector resistance and decide between replacing the harness, the fuel injector or the MCM2.1. This library page summarises the official Detroit fault-code sheet published on TruckFaultCodes.com (Copyright 2017) and is meant as a quick reference. The source document lists exact resistance or pressure ranges, connector pin numbers and torque values in charts, so always confirm those specifications against current Detroit Power Service Literature and the diesel diagnostic tool before condemning a part. Recording your measured values as you work through each step also makes it easier to escalate the case to the Detroit Customer Support Center at 800-445-1980 if the fault stays active. The complete PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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