SPN 520310 FMI 4 is a Detroit DD Series diagnostic fault-code sheet that documents the Cylinder #6 Needle Control Valve Abnormal Operation (Min) Cold condition and its factory troubleshooting sequence. The sheet lists the SPN and FMI identifiers, a short description of the condition, and the repair steps in the order Detroit recommends. It is a concise reference sheet, 6 pages long, aimed at technicians who read the code with a scan tool and need to know the correct next step.
SPN 520310 FMI 4 troubleshooting overview
This six-page sheet covers cylinder #6 needle control valve abnormal operation (min) cold, monitored on the cylinder #6 injector needle control valve with a 25% derate. The procedure checks for SPN 168 and 723 faults, inspects the rear fuel injector harness 14-pin connector, measures injector resistance values, and works through the rocker cover, harness and MCM2.1 120-pin connector to isolate the failed component.
Official document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD Series (EPA 2007-Current) |
| System / group | Diagnostic Trouble Codes (DTCs) |
| SPN | 520310 |
| FMI | 4 — Cylinder #6 Needle Control Valve Abnormal Operation (Min) Cold |
| Source | TruckFaultCodes.com fault-code reference (Copyright 2017) |
| Pages | 6 |
| File size | 0.7 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification and description (injector needle control valve, MIL/CEL, 25% derate)
- Step 1–4: check for SPN 168/723 codes and inspect the rear fuel injector 14-pin connector
- Step 5–8: measure injector resistance values, remove the rocker cover and harness, replace the injector or harness
- Step 9–13: inspect the MCM2.1 120-pin connector, test the MCM2.1 and confirm the repair
Applicable truck models
This code sheet applies to Detroit DD Series engines (DD13, DD15 and DD16) built to GHG14 emissions specifications under the EPA 2007-Current platform, and Detroit cross-lists it under both the DD Series and Series 60 (DDEC VI, EPA 2007) diagnostic trees. For factory service literature and warranty details, refer to the official Detroit Diesel website.
Who needs this SPN 520310 FMI 4 manual
This reference is written for engine technicians diagnosing a cold injector fault who need the injector resistance checks and MCM2.1 test sequence. Keep the 520310 FMI 4 sheet on hand so the code can be diagnosed and verified before it is cleared.
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