Eaton Fuller Advantage (2017) Fault Code: 61 PID: SPN: 772 FMI: 12 Rail Motor Circuit: Bad Intelligent Device

Overview:
The Fuller Advantage Transmission is equipped with an X-Y Shifter that selects a transmission gear. The X-Y Shifter motors are controlled with electrical current supplied by the TECU to move the Shift Finger either side-to-side (rail selection) or fore-and-aft (gear engagement and disengagement). Fault Code 61 indicates a failure with the circuit controlling the Rail Motor and the side-to-side movement of the X-Y Shift Finger.

Detection:
The system can identify an issue with the X-Y Shifter Rail Motor circuit, the TECU rail motor controller or the power and ground connections to the TECU under the following conditions:
• FMI 1, 5 and 12 can be detected when the X-Y Rail Motor is energized.

Conditions to Set Fault Code Active:
FMI 12 – Bad Intelligent Device: Transmission fails to complete a shift and the TECU detects intermittent fluctuations in supply voltage due to poor connections, shorted Rail Motor circuit or a hardware failure of the TECU.

Fallback:
All FMIs
• “F” flashes in gear display.
• Service light flashes (if equipped).
• Engine may not crank.
• Transmission may not engage a gear from neutral.
• Transmission does not shift while vehicle is moving.
• Until fault becomes Inactive, driver may have to shut off engine with transmission in gear.

Conditions to Set Fault Code Inactive:
FMI 1, 5, 12: Set Inactive when the shift is completed.

Possible Causes:
FMI 12
1) Vehicle Power Supply
– Poor power or ground supply to TECU (may be in conjunction with Fault Codes 33 or 34)
– Bent, spread, corroded or loose terminals
– Wiring shorted to ground, shorted to power or open
2) Vehicle Batteries
– Internal failure
3) Vehicle 30-amp Battery Fuse
– Bent, spread, corroded or loose terminals
– Fuse missing or improperly seated
4) TECU
– Internal failure