UltraShift PLUS
TRTS0940 EN-US
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July 2024 - A

Fault Code 99: Direction Mismatch

J1587: MID 130 SID 58 FMI 12, 14

J1939: SA 3 SPN 781 FMI 12, 14

Overview

The UltraShift PLUS transmission uses the X-Y Shifter to select the proper rail and engage or disengage a gear based on the driver’s selected mode of operation. The position of the X-Y Shift Finger is controlled and monitored by the Transmission Electronic Control Unit (TECU) by way of the X-Y Gear Position and Rail Position Sensors.

Fault Code 99 is set when the TECU commands the X-Y Shifter to move to a specific position and the reported Shift Finger position achieved does not match the desired position.

Detection

This fault can only be detected when there are no failures of the TECU or X-Y Position Sensors. This fault code is set when the X-Y Gear Position and Rail Position values are valid, but do not match the requested positions requested by the TECU.

Conditions to Set Fault Code Active

FMI 12 – Bad Intelligent Device: The TECU X-Y commanded finger position does not match the X-Y Position Sensors reported finger position.

FMI 14 – Special Instructions: If the requested gear position commanded by the TECU is different than the current Shift Finger position the fault code is set Active.

Fallback

All FMIs:

  • “F” flashes in gear display.
  • Service light flashes (if equipped).
  • Transmission remains in current gear.
  • May not engage a start gear from neutral.
  • Engine may have to be shut down with the transmission still in gear.
  • Audible warning tone sounds.

Conditions to Set Fault Code Inactive

All FMIs: Neutral mode is selected and the system confirms Neutral.

Possible Causes

All FMIs:

  • TECU
    • Internal failure
  • Transmission Harness
    • Bent, spread, corroded or loose terminals
    • Wiring shorted to ground, shorted to power or open
  • X-Y Shifter
    • Bent, spread, corroded or loose terminals
    • Gear Position Sensor damaged
    • Rail Position Sensor damaged

Component Identification

None

Fault Code 99 Troubleshooting

A
Purpose:Check for Active or Inactive fault codes.

  1. Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.

  • Contact Eaton at (800) 826-4357 for repair strategy.