Eaton Fuller Advantage (2017) Fault Code: 15 PID: SPN: 751 FMI: 9 HIL Shift Device Communication: Abnormal Update Rate

Overview:
Vehicles equipped with an Fuller Advantage transmission may also have an Eaton Push Button Shift Control Device (PBSC). The PBSC broadcasts driver shift requests to the Transmission Electronic Control Unit (TECU) through a high speed proprietary data link called the High Integrity Link (HIL). The portion of the HIL that connects the TECU to the PBSC is contained within the 38-Way Vehicle Harness. The Electronic Clutch Actuator (ECA) communicates to the TECU through a portion of the HIL contained in the Transmission Harness. Fault Code 15 indicates a loss of communication between the TECU and PBSC.

Detection:
The TECU monitors communication with the PBSC over the HIL. If the TECU loses communication with the PBSC, Fault Code 15 sets Active.

Conditions to Set Fault Code Active:
FMI 9 – Abnormal Update Rate: TECU loses communication with the PBSC for 5 seconds or longer, but can still communicate with the ECA.

Fallback:
FMI 9
• “F” flashes in gear display.
• Service light flashes (if equipped).
• Transmission may not engage a gear from neutral.
• Transmission is limited to down shifts only.
• Once the transmission re-engages the start gear, the transmission will not shift until the fault becomes Inactive.
• Once the vehicle stops, the transmission will not engage a start gear until the fault becomes Inactive.

Conditions to Set Fault Code Inactive:
FMI 9: The TECU establishes communication with the PBSC for 10 seconds

Possible Causes:
1) High Integrity Link (HIL)
– Wiring shorted to ground, shorted to power or open
– Bent, spread, corroded or loose terminals
– Missing or additional terminating resistors
2) 38-Way Vehicle Harness Connector
– Wiring shorted to ground, shorted to power or open
– Bent, spread, corroded or loose terminals
3) Vehicle Power and Ground Supply to PBSC
– Poor power or ground supply to PBSC
– Bent, spread, corroded or loose terminals
– Wiring shorted to ground, shorted to power or open
4) PBSC
– Internal failure
5) TECU
– Internal failure