SPN 5361 FMI 16 is the Detroit DD Series fault code for Cylinder #4 Engine Smoothness Control / Quantity Low, and this diagnostic sheet lists the description, enabling conditions and step-by-step troubleshooting. Published on TruckFaultCodes.com (Copyright 2017), it explains that the MCM2.1 has driven the injector pulse to its minimum value while trying to smooth idle on cylinder #4.
Official document details
| Brand | Detroit |
| Model coverage | DD13, DD15, DD16 (DD Series, EPA 2007-Current) and Series 60 DDEC VI |
| System/Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 5361 FMI 16 |
| Source | TruckFaultCodes.com, Copyright 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code description (SPN and FMI)
- Monitored parameter and enabling conditions
- Dash lamps (MIL) and engine reaction
- Entry conditions for the code
- Possible causes (cylinder kit, valve train, injector)
- Troubleshooting steps 1 to 5
Applicable truck models
This fault sheet applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) range, and the same SPN/FMI logic is referenced for the Series 60 DDEC VI platform. All removals assume a Three-Filter fuel system. For OEM-level service literature and engine coverage, see the official Detroit Diesel website.
SPN 5361 FMI 16 troubleshooting steps
After confirming the code with the diesel diagnostic tool, Step 1 checks for multiple codes and services any others first. Step 2 runs the relative cylinder compression test; if cylinder #4 reads low compression the failure is mechanical. If all cylinders are within 10%, Step 3 brings the engine above 60°C (140°F), then Step 4 reads the Idle Speed Balance (ISB) value for cylinder #4 — a value pinned at the +100 limit points to a fueling fault. Step 5 inspects the fuel line from rail to injector; when damage is found the high pressure fuel injector lines are replaced, otherwise the fuel injector itself is replaced. The document notes MIL illuminate and no engine derate accompany this code.
Who needs this 5361 FMI 16 manual
Heavy-duty diesel technicians and DD Series fleet owners chasing a rough-idle or single-cylinder power complaint use this 5361 FMI 16 manual to decide whether the root cause is mechanical compression loss or a fueling fault before replacing any parts.
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