The Detroit EGR differential pressure fault-code sheet is a Detroit DD Series (EPA 2007-Current) troubleshooting document for exhaust gas recirculation differential pressure that reads too low in the high box. It reproduces the official fault identification, the monitored parameters or service notes printed on the document, and the recommended diagnostic actions a heavy-duty technician follows step by step.
Detroit EGR differential pressure document details
| Brand | Detroit |
| Model coverage | Detroit DD13, DD15 and DD16 diesel engines built from EPA 2007 onward; the same DTC logic is cross-referenced on Series 60 DDEC VI applications. |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication no. | Not printed on document; sourced from Detroit Power Service Literature |
| Year / Revision | © 2017 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 411 / FMI 1
- Description and enabling conditions
- Engine reaction and verification
- Troubleshooting steps
- EGR cooler, crossover tube and mixer pipe checks
- Sensor harness inspection
Applicable truck models
Detroit DD13, DD15 and DD16 diesel engines built from EPA 2007 onward; the same DTC logic is cross-referenced on Series 60 DDEC VI applications. Fault code SPN 411 / FMI 1 is diagnosed with a diesel diagnostic tool such as DDDL or DDRS. For factory procedures and the latest module software, see the Detroit Diesel official website.
Diagnostic steps and checks
The description block gives detailed enabling conditions — engine running over five minutes, 1100-1850 rpm, 1400-2800 N·m torque, steady-state and out of regeneration, coolant above 65 C — and a 10% derate with the MIL and CEL lit. The steps read EGR delta P sensor voltage on pin 109, inspect the delivery pipe and venturi ports, remove the EGR cooler hot pipe, crossover tube and mixer pipe to check for blockage, and inspect the harness connector for loose or corroded pins, referencing Detroit Power Service Literature for each removal.
Who needs this Detroit EGR differential pressure manual
This troubleshooting sheet suits Detroit-certified technicians and independent heavy-duty workshops that read SPN 411/FMI 1 on a scan tool and want the factory decision tree, pin references and component checks before replacing parts.
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