The SPN 979 FMI 9 document is a Detroit DD Series diagnostic trouble code guide covering the J1939 PTO message not received this ignition cycle condition and its step-by-step troubleshooting. This 1 page PDF is compiled from the TruckFaultCodes.com Detroit fault codes reference (© 2017) for the DD Series (EPA 2007-Current) / DTCs set. It is written for workshop diagnostics rather than general reading.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) engines |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic trouble code | SPN 979/FMI 9 — J1939 PTO Message Not Received This Ignition Cycle |
| Publication no. | Not stated (TruckFaultCodes.com DTC reference) |
| Year / Revision | © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 979 FMI 9 document sections
- Fault code identification: SPN 979/FMI 9 — J1939 PTO message not received this ignition cycle
- Checking for multiple codes: CPC2 SPN 168/FMI 0/14/18 battery voltage faults
- Checking for MCM2.1 SPN 625/FMI 9 CAN line faults
- CPC2 Group PGR001 PTO Source Address SAE J1939 configuration (23 or 49)
- Using ServiceLink to confirm module configuration and communication status
Applicable truck models covered
The SPN 979 FMI 9 fault applies to trucks fitted with Detroit DD Series (EPA 2007-Current) engines and the associated Common Powertrain Controller and Motor Control Module modules, covering all model years. The procedure references Common Powertrain Controller, Motor Control Module, ServiceLink and CAN line, and works through checking related battery-voltage and CAN codes, then verifying CPC2 PTO Source Address configuration. Confirm the engine and emissions configuration against the vehicle build before ordering parts; verify current procedures on the Detroit Diesel official site.
Who needs this 979 FMI 9 manual
This reference suits Detroit-certified technicians and fleet workshop owners diagnosing the J1939 PTO message not received this ignition cycle condition on DD Series engines. Every troubleshooting step and decision branch from the original PDF is preserved so the on-vehicle diagnosis can be followed in sequence, and the document names the exact connectors, pins and modules involved. Use it alongside a Detroit-compatible scan tool such as DDDL or DDRS.
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