Pinpoint Test Ai : The GFM (Generic Function Module) Does Not Respond To The Diagnostic Scan Tool: Notes
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Module Communications Network for schematic and connector information.
Refer to Trailer/Camper Adapter for schematic and connector information.
Normal Operation and Fault Conditions
The GFM (trailer TPMS) communicates with the diagnostic scan tool through the Medium Speed Controller Area Network 2 (MS-CAN2). Diagnostic messages are sent/received between the DLC and the diagnostic scan tool through the HS-CAN2 circuits at the DLC, and are translated through the GWM to the Medium Speed Controller Area Network 2 (MS-CAN2).
Possible Sources
- Fuse
- Wiring, terminals and connector
- GFM
Visual Inspection and Diagnostic Pre-checks
Verify BJB fuse 34 (10A) is OK.