This SPN 3599 FMI 3 document is a Detroit DD Series fault-code sheet for the MCM internal injector power supply failed high condition on EPA10 and GHG14 engines. It records the monitored parameter, engine reaction, and the single repair instruction.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / group | DD Series / DTCs |
| SPN | 3599 |
| FMI | 3 |
| Condition | MCM internal injector power supply failed high |
| Emissions level | EPA10 and GHG14 |
| Source | Detroit Power Service Literature |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3599 FMI 3 fault description
The sheet names the monitored parameter as the MCM internal 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 fault is internal to the module, the only troubleshooting step is to replace the Motor Control Module.
- Monitored parameter: MCM internal 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 diesel engines built to the EPA10 and GHG14 calibration and managed by a Motor Control Module. Because the supply is internal, confirm the reading with a diesel diagnostic tool before ordering the module from the official Detroit Diesel website.
Who needs this SPN 3599 FMI 3 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 repair. With no external circuit to test, the sheet keeps the diagnosis short and directs the technician straight to the module, which shortens shop time on an otherwise puzzling complaint.
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