Eaton Fuller Advantage (2017) Fault Code: 63 PID: SPN: 773 FMI: 1 Gear Motor Circuit: Data Valid but Below Normal

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 63 indicates a failure of the circuit controlling the Gear Motor and the fore-and-aft movement of the X-Y Shift Finger.

Detection:
The system can identify an issue with the X-Y Shifter Gear Motor circuit, the TECU gear 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 Gear Motor is energized.

Conditions to Set Fault Code Active:
FMI 1 – Data Valid but Below Normal: Transmission fails to complete a shift and the measured current draw of the Gear Motor is below expected values, but no short to ground or open circuit condition is detected.

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 the vehicle is moving.
• Until the 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 1, 5
1) Transmission Harness
– Bent, spread, corroded or loose terminals
– Wiring shorted to ground or open
2) X-Y Shifter Gear Motor
– Bent, spread, corroded or loose terminals
– Wiring shorted to ground or open
– Gear Motor shorted to ground, partial short to ground, or open
– Gear Motor internal failure
3) TECU
– Internal failure