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 6 can be detected when the X-Y Gear Motor is not energized

Conditions to Set Fault Code Active:
FMI 6 – Current Above Normal or Shorted Circuit: TECU detects a short to power on the Gear Motor circuit for 0.5 seconds at power up or prior to a shift.

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 6: An electrical short or open circuit is not detected for 0.5 seconds

Possible Causes:
FMI 6
1) Transmission Harness
– Wiring shorted to power
2) TECU
– Internal failure