Eaton Transmission RWRG0078 Service Manual
RWRG0078 - Fault Code 63 Pre-Authorization | Fault Isolation Procedures TRTS0940
RWRG0078 - Fault Code 63 Pre-Authorization
Overview
The UltraShift PLUS 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.
Note: it has been determined that performing an electrical
pre-test is not needed.
Symptom(s)
• “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.
Warranty Coverage
This Warranty Repair Guideline repair DOES NOT apply if
the Fault Code is Inactive and there are other Active Faults
in the Eaton/OEM System. If there are other Active Faults,
please follow normal troubleshooting procedure using the
correct troubleshooting manual per transmission model.
This Pre-Authorization DOES NOT apply if the failed part
has been replaced within the last 90 days on the truck.
This Pre-Authorization DOES NOT apply if the failed component is mounted to a Medium Duty transmission.
The warranty coverage varies depending on vehicle vocation and transmission model type. Warranty coverage is the
same as that of its respective transmission coverage including extended warranty.
Possible Causes
FMI 1, 5
• Transmission Harness
• X-Y Shifter Gear Motor
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© 2017 Eaton. All rights reserved
2017.05.8
Component Identification
1
7
2
6
3
5
4
Pre-Authorized Warranty Repair Guideline RWRG0078
1. X-Y Shifter
2. 2-Way Gear Motor Connector (blue)
3. 2-Way Gear Motor Connector Body (blue)
4. 4-Way Diagnostic Connector
5. 38-Way Transmission Harness Connector
6. 38-Way Vehicle Harness Connector
7. Transmission Electronic Control Unit (TECU)
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