Eaton Fuller Advantage (2017) Fault Code: 63 PID: SID 40 SPN: 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

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