This Eaton fault code 99 manual documents the Direction Mismatch DTC for the Fuller Advantage transmission, set when the TECU commands the X-Y Shifter to a position and the reported Shift Finger position does not match. It is part of Eaton publication TRTS0980, Fault Isolation Procedures, and lists the J1587 SID 58 and J1939 SPN 781 addresses under FMI 14.
Eaton fault code 99 document details
| Brand | Eaton |
|---|---|
| Model coverage | Fuller Advantage Heavy Duty automated transmission |
| System / Group | DTCs — X-Y Shifter |
| Publication no. | TRTS0980 |
| Year / Revision | 2016.06.20 |
| Pages | 1 |
| File size | 0.03 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Detection
- Conditions to Set Fault Code Active
- Fallback
- Conditions to Set Fault Code Inactive
- Possible Causes
- Component Identification (None)
The Fuller Advantage transmission uses the X-Y Shifter to select the proper rail and engage or disengage a gear, with the Shift Finger position controlled and monitored by the TECU through the X-Y Gear Position and Rail Position Sensors. This fault can only be detected when there are no failures of the TECU or the position sensors, and the reported values are valid but do not match the requested positions.
Applicable truck models
This one-page sheet applies to Eaton Fuller Advantage Heavy Duty transmissions equipped with the X-Y Shifter. Possible causes under FMI 14 include TECU internal failure, bent, spread, corroded or loose transmission harness terminals, wiring shorted or open, and a damaged Gear Position or Rail Position Sensor. Fallback places an “F” in the gear display, sounds an audible tone, and holds the current gear. Confirm model coverage with the manufacturer on the Eaton official website.
Who needs this Eaton fault code 99 manual
Driveline technicians facing a transmission stuck in gear or unable to select a start gear from neutral use this reference to confirm the Direction Mismatch condition and its causes before removing the X-Y Shifter.
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