The Detroit output shaft speed fault-code sheet is a Detroit DD Series (EPA 2007-Current) troubleshooting document for a J1939 transmission output-shaft speed signal that is erratic. 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 output shaft speed document details
| Brand | Detroit |
| Model coverage | Detroit DD Series engines (DD13, DD15 and DD16) from EPA 2007-Current, with equivalent coverage noted for 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 | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 191 / FMI 19
- Description: CAN communication parameter
- Companion-code checks (SPN 168, SPN 625)
- CPC reprogramming question
- Module communication troubleshooting with ServiceLink
Applicable truck models
Detroit DD Series engines (DD13, DD15 and DD16) from EPA 2007-Current, with equivalent coverage noted for Series 60 (DDEC VI) applications. Fault code SPN 191 / FMI 19 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 routine first checks for companion codes — CPC SPN 168/FMI 0/14/18 battery-voltage faults and MCM SPN 625/FMI 9 — and repairs those or the Controller Area Network line first. If only the J1939 error is present, it asks whether the CPC was recently reprogrammed; if not, ServiceLink is connected to list which modules are configured and their communication status so the technician can follow the module-specific communication procedure for the affected controller. The monitored parameter is CAN communication with the MIL lit.
Who needs this Detroit output shaft speed manual
This troubleshooting sheet suits Detroit-certified technicians and independent heavy-duty workshops that read SPN 191/FMI 19 on a scan tool and want the factory decision tree, pin references and component checks before replacing parts.
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