SPN 4752 FMI 31 is the Detroit DD Series (EPA 2007–Current) diagnostic trouble code that Detroit documents as “Exhaust Gas Recirculation (EGR) Cooler Performance Monitor”. This 2-page EPA10 fault-code sheet documents the monitored intake-manifold-temperature parameter and enabling conditions, the dash-lamp indication and engine reaction, and the ordered troubleshooting steps used to confirm and clear the condition. The monitor uses the intake manifold temperature sensor under a defined set of enabling conditions and illuminates the MIL, and the procedure separates a temperature-sensor fault from a genuinely blocked or leaking EGR cooler.
SPN 4752 FMI 31 document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | Detroit DD13, DD15 and DD16 engines |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Publication / source | Detroit Power Service Literature (TruckFaultCodes reference, 2017) |
| Emissions family | EPA10 |
| Pages | 2 |
| File size | 0.23 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code description and enabling conditions
- Cooling system and fan operation check
- Intake manifold air temperature monitoring
- Intake manifold temperature sensor connector inspection
- EGR system external-leak inspection
- EGR hot pipe, crossover tube and mixer pipe removal
- EGR cooler cleaning or replacement on DD13, DD15 and DD16
Applicable truck models
This fault-code procedure applies to trucks powered by the Detroit DD13, DD15 and DD16 engines on the DD Series (EPA 2007–Current) platform. After ruling out cooling-system and fan concerns, the technician checks whether the intake manifold air temperature reads above 93°C, inspects the sensor connector for pin damage, looks for external EGR leakage, and then removes the EGR hot pipe, crossover tube and mixer pipe to check for build-up before cleaning the piping and replacing the EGR cooler. Always confirm the engine family and EPA10 emissions level against the vehicle, and cross-check the latest procedure in the Detroit Power Service Literature on the official Detroit website.
Who needs this SPN 4752 FMI 31 manual
Diesel technicians, fleet maintenance teams and workshop owners diagnosing an EGR cooler performance fault or an emissions MIL on a DD13, DD15 or DD16 on Detroit DD Series trucks use this sheet to work the fault in order instead of guessing. The DD13 versus DD15/DD16 removal references make the cooler replacement specific to the engine on the bench.
The complete 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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