SPN 625 FMI 8 is the Detroit DD Series diagnostic fault-code sheet (SPN 625 / FMI 8) that documents a DM1 message that is not received or has stopped arriving on the CAN communication network. This 7-page PDF, drawn from the Detroit / Detroit Diesel Corporation (DDC) troubleshooting reference (© 2017), gives the workshop the exact measured checks needed to confirm and repair the fault rather than guess at it.
SPN 625 FMI 8 document details
| Brand | Detroit (Detroit Diesel Corporation) |
| Model coverage | DD Series (EPA 2007-Current); Series 60 (DDEC VI, EPA 2007) |
| System / Group | Diagnostic Trouble Codes (DTCs) – SPN 625 / FMI 8 |
| Source | Detroit / DDC diagnostic troubleshooting reference |
| Year / Revision | © 2017 |
| Pages | 7 |
| File size | 0.36 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code definition (SPN 625, FMI 8)
- Description and monitored parameters
- Enabling conditions and dash lamps
- Troubleshooting steps
- Battery-voltage and programming checks
- Detroit Customer Support contact
Fault definition and diagnosis
The monitored parameter is CAN communication; the monitor is always enabled with a typical duration of two seconds and drives the MIL and CEL dash lamps. Diagnosis begins by checking for battery-voltage faults (SPN 168) and confirming whether the Aftertreatment Control Module (ACM), Motor Control Module (MCM) or Common Powertrain Controller (CPC) was recently programmed before the fault codes are cleared and the vehicle is retested.
Applicable truck models
It applies to Detroit DD Series engines (EPA 2007 to current) and Series 60 (DDEC VI, EPA 2007) engines networked through the ACM, MCM and CPC modules. For engine specifications and authorised service information, see the official Detroit engine website.
Who needs the SPN 625 FMI 8 manual
Diesel technicians and workshop owners diagnosing this Detroit DTC with DiagnosticLink or ServiceLink use it to follow the manufacturer sequence step by step, and to confirm the SPN 625 / FMI 8 repair before returning the truck to service.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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