The Detroit EGR delta pressure fault-code sheet is a Detroit DD Series (EPA 2007-Current) troubleshooting document for an exhaust gas recirculation (EGR) pressure signal that reads too low at high speeds and loads. 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 delta 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 | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 411 / FMI 1
- Troubleshooting steps (key on, engine off)
- EGR delivery pipe and venturi port checks
- EGR cooler, crossover tube and mixer pipe inspection
- Harness resistance measurements at the MCM connector
- MCM software version verification
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
With the key on and the engine off, the technician monitors EGR delta P voltage on pin 109 and confirms it sits between 0.55 and 0.83 volts. The sheet then inspects the EGR delivery pipe and venturi ports for blockage, removes the EGR cooler hot pipe, crossover tube and mixer pipe, checks the EGR valve for a broken butterfly, and measures harness resistance at the MCM 120-pin connector on pins 103, 109 and 117. It closes by confirming the MCM software version is V13.2 or higher, or reprogramming a module at V11.4 or lower using Detroit Power Service Literature.
Who needs this Detroit EGR delta 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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