AutoShift®/UltraShift Gen3
TRSM0930 EN-US
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June 2022 - A

Medium-Duty Transmission Electronic Control Unit (TECU)

Special Instructions

None

Special Tools

  • Basic hand tools

Component Identification

Medium-Duty

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1. Cap Screw

2. Transmission ECU (TECU)

3. 38-way Connectors

4. Cap Screw (Located inside 38-way connectors)

Procedure - Removal

Caution
The battery negative must be disconnected prior to unhooking the Transmission ECU (TECU) 38-way connectors.
Caution
Do not allow contamination into the TECU or connectors.

  1. Connect ServiceRanger to vehicle and record current configuration settings before removing the TECU from the transmission. (Refer to “ServiceRanger User Guide” TCMT-0071 for more information.)

  2. Disconnect the following connectors:

    • Using a 5/32” hex wrench, unscrew and disconnect the Transmission Harness 38-way Connector and Vehicle Interface 38-way Connector.
    _Graphics/Web/trsm0930p37a.jpg

  3. Using a 7/16” socket, remove the 3 mounting bolts.

    _Graphics/Web/trsm0930p37b.jpg

  4. Remove the Transmission Controller assembly from the locating studs.

    _Graphics/Web/trsm0930p38a.jpg

Procedure - Installation

Caution
Battery negative must remain disconnected until the TECU 38-way connectors are installed.
Caution
Do not allow contamination into the TECU or connectors.

  1. Position the Transmission Controller on the locating studs.

    _Graphics/Web/trsm0930p38a.jpg

  2. Using a 7/16” socket, install the 3 Transmission Controller mounting bolts and tighten to 7-9 lb-ft. (9.5-12.2 Nm).

    _Graphics/Web/trsm0930p37b.jpg

  3. Reconnect the following connectors:

    Caution
    Do not exceed the torque on the Transmission Harness or Vehicle Harness Connector or bolt failure will occur.
    • Using a 5/32” wrench, reconnect the Transmission Harness 38-way Connector and tighten to 25 +/- 3 lb-in. (2.82 +/- 0.33 Nm).
    • Using a 5/32” wrench, reconnect the Vehicle Interface 38-way Connector and tighten to 25 +/- 3 lb-in. (2.82 +/- 0.33 Nm).
    • Reconnect the negative battery cable.
    _Graphics/Web/trsm0930p37a.jpg

  4. To operate properly, the system must be calibrated as follows:

    Notice
    The Electric Shifter must be calibrated before the vehicle is placed in operation.
    • Turn ignition switch on. Allow the transmission to power up.
    • Turn ignition off and wait 2 minutes.

    Note: UltraShift AW3- Perform clutch calibration: Clutch Calibration.

  5. Connect ServiceRanger to vehicle and compare recorded configuration settings (step 1 in removal process) to the replacement TECU. Update and save all configurations that are different. (Refer to “ServiceRanger User Guide” TCMT-0071 for more information.)