UltraShift PLUS
TRTS0940 EN-US
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November 2023 - A

Transmission Shift Complaint

Overview

This symptom-driven test is performed if a shift complaint exists and there are no Active or Inactive fault codes.

Detection

  • Transmission may not be able to complete a shift.
  • Transmission may exhibit slow or harsh shifting.

Possible Causes

  • Low Capacity Inertia Brake (LCIB)
    • Internal Failure
  • Input Shaft Speed Sensor
    • Internal Failure
  • Transmission Electronic Control Unit (TECU)
    • Internal Failure
  • Transmission Harness
    • Bent, spread, corroded or loose terminals
    • Wiring shorted to ground, shorted to power or open
  • Vehicle Air System
    • Low vehicle air pressure
    • Contamination in air supply
    • Air leaks
    • Filter-Regulator Failure
  • Range Solenoid Valve
    • Mechanical Failure
  • Splitter Solenoid Valve
    • Mechanical Failure
  • Mechanical Transmission
    • Failed Auxiliary Transmission components
    • Tone Wheel damage
    • Range Synchronizer Failure
    • Range Cylinder, Piston or Yoke wear or damage
    • Range Cover Gasket Failure
    • Splitter Cylinder, Piston or Yoke wear or damage
    • Splitter Cover Gasket Failure

Component Identification

_Graphics/LineArt/TRTS0940_ShiftInterlock_ID1.png

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. Gear Position Sensor

4. 3-Way Gear Position Sensor Connector

5. 2-Way Gear Motor Connector (blue)

6. 2-Way Gear Motor Connector Body (blue)

_Graphics/LineArt/TRTS0940_ShiftInterlock_ID2.png

1. X-Y Shifter

2. 2-Way Rail Motor Connector (black)

3. 2-Way Rail Motor Connector Body (black)

4. 3-Way Rail Position Sensor Connector

5. Rail Position Sensor

6. 38-Way Vehicle Harness Connector

Transmission Shift Complaint Test

A
Purpose:Check for Active or Inactive fault codes.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Retrieve Snapshot and VPA data by creating a Service Activity Report within ServiceRanger.

  4. Update transmission software to latest available level.

    Notice
    To avoid damaging the TECU, use an Eaton-approved communications adapter and ensure all satellite systems are disabled before updating software.

  5. Retrieve transmission and vehicle fault codes and FMIs, and their occurrences and timestamps.

B
Purpose:Verify condition of power and ground supply.

  1. Perform the Electrical Pretest. Reference the Electronic Clutch Actuator (ECA) Identification Overview. Record the reading(s) from the Load Test in Step C of the Electrical Pretest in the table.

  • If Electrical Pretest passes, Go to Step C

  • If Electrical Pretest fails, repair per Electrical Pretest instructions. Retest vehicle operation.

BatteryVoltage DropLoad Test Status (Pass/Fail)
1
2
3
4
5
C
Purpose:Document the vehicle symptoms by filling out the Driver Questionnaire.

  1. Document the vehicle shift complaint by completing the Driver Questionnaire.

D
Purpose:Operate vehicle and attempt to recreate vehicle symptom.

  1. Drive or operate vehicle and attempt to duplicate the shift complaint.

    Notice
    The purpose of this test is to duplicate the complaint and set a fault code or capture a driver triggered snapshot of the event happening.

  2. If the shift complaint is duplicated, while driving capture a driver triggered snapshot of the event by placing the transmission shift device into Low (L) mode, and quickly pressing the upshift button twice.

    Notice
    Capturing the driver triggered snapshot is time sensitive; for the best results, perform this sequence immediately after the symptoms occur.
    _Graphics/LineArt/TRTS0940_ShiftComplaint_PushButton.png

  3. The transmission will set a tone and the letters “ST” will appear in the gear display if the Snapshot is captured.

    _Graphics/LineArt/TRTS0940_ShiftComplaint_ST Gear Display.png

    Note: A driver triggered snapshot will capture data that cannot otherwise be captured. This data can be reviewed with Eaton technical support.

E
Purpose:Collect a new Service Activity Report.

  1. Key off and allow the transmission to perform a complete power down.

  2. Key on with engine off.

  3. Connect ServiceRanger.

  4. Retrieve Snapshot and VPA data by creating a Service Activity Report and select “Send to Eaton”.

  5. Retrieve and record the transmission fault codes and FMIs, and their occurrences and timestamps.