This DEF purge pressure high sheet documents Detroit fault code SPN 4334 / FMI 17 on EPA10 engines, monitored at engine idle then key off. The three-page procedure runs an output component test, compares pressures, and inspects the nozzle and return line.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD-Series (DD13, DD15, DD16) and Series 60 (DDEC VI) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 4334 / FMI 17 |
| Fault name | High DEF purge pressure |
| Emissions platform | EPA10 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
| Source | TruckFaultCodes.com (© 2017); Detroit Power Service Literature |
DEF purge pressure high sections covered
The routine first rules out other active faults, then checks the sensor reading before moving to the nozzle and air-line routing.
- Monitored parameter and enabling conditions; MIL lamp
- Run the SCR output component test and repair any active faults
- Compare DEF pressure to barometric (Baro) and DEF air pressure
- Remove and recheck the DEF pressure sensor if out of tolerance
- Check air-line routing, DEF return line and nozzle for damage
- Run the 60-second SCR air pressure test to verify
Applicable truck models
These steps cover Detroit DD-Series (DD13, DD15 and DD16) and Series 60 DDEC VI engines on the EPA10 platform with the ACM2 aftertreatment control module. Sensor and nozzle removal chapters are in Detroit Power Service Literature at the Detroit Diesel official website.
Who needs this purge pressure high manual
This purge pressure high manual is for technicians resolving SPN 4334 / FMI 17, giving the pressure-comparison method and nozzle checks that a purge-side fault needs before parts are changed.
The full 3-page PDF is available in the DiagTechPro manuals library; a free account is required to download. For workshop reference, Detroit documents the matching component removal and installation steps for SPN 4334 / FMI 17 in Power Service Literature, and technicians should keep the wiring pin numbers shown in this sheet on hand while testing on the bench.
Related manuals library
