This SPN 3599 FMI 4 document is a Detroit DD Series fault-code sheet for the MCM internal fuel injector power supply failed low condition on EPA10 and GHG14 engines. It records the monitored parameter, enabling conditions, engine reaction, and the single repair step.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / group | DD Series / DTCs |
| SPN | 3599 |
| FMI | 4 |
| Condition | MCM internal fuel injector power supply failed low |
| Emissions level | EPA10 and GHG14 |
| Source | Detroit Power Service Literature |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3599 FMI 4 fault description
The sheet lists the monitored parameter as the MCM internal fuel injector power supply, always enabled, with a typical duration of two seconds. It sets the MIL and CEL dash lamps, applies a 25 percent derate, and is verified at engine idle for one minute. Because the failure is internal to the module, the only troubleshooting instruction is to replace the Motor Control Module.
- Monitored parameter: MCM internal fuel injector power supply
- Enabling conditions, monitor sequence and execution frequency
- Dash lamps (MIL, CEL) and 25 percent derate reaction
- Verification at engine idle for one minute
- Step 1 – Replace the Motor Control Module
Applicable truck models
This fault code applies to Detroit DD Series heavy-duty diesel engines built to the EPA10 and GHG14 calibration and managed by a Motor Control Module. Because the supply is internal, confirm the diagnosis with a diesel diagnostic tool before ordering the module from the official Detroit Diesel website.
Who needs this SPN 3599 FMI 4 manual
Diesel technicians and workshop owners who see a 25 percent derate with this internal power-supply fault use this sheet to confirm the reaction data and the module-replacement instruction before quoting the job. Because there is no external harness to test, the document keeps the diagnosis short and points straight to the module, saving time on a difficult intermittent complaint.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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