UltraShift PLUS
TRSM0940 EN-US
|
March 2024 - A

Transmission Electronic Control Unit (TECU)

Special Instructions

None

Special Tools

Basic hand tools

Component Identification

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1. Nut

2. Bracket

3. Transmission Electronic Control Unit (TECU)

4. 38-Way Connectors

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

TECU Removal

  1. Connect ServiceRanger to vehicle and create a service activity report to save current configuration settings before removing the TECU from the Transmission. (Refer to “ServiceRanger User Guide” TCMT0072 for more information.)

    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.

  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/trsm0930p57a.png

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

    _Graphics/Web/trsm0930p57b.png

  4. Remove the Transmission Controller Retaining Bracket.

    _Graphics/Web/trsm0930p57c.png

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

    _Graphics/Web/trsm0930p57d.png

TECU 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/trsm0930p57d.png

  2. Place the Transmission Controller Retaining Bracket over the TECU.

    _Graphics/Web/trsm0930p57c.png

  3. Using a 7/16” socket, install the 3 Transmission Controller mounting nuts and tighten to 7–9 lb-ft (9.5–12.2 N•m).

    _Graphics/Web/trsm0930p57b.png

  4. 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 N•m).
    • Using a 5/32” wrench, reconnect the Vehicle Interface 38-way Connector and tighten to 25 +/- 3 lb-in (2.82 +/- 0.33 N•m).
    • Reconnect the negative battery cable.
    _Graphics/Web/trsm0930p57a.png

  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” TCMT0072 for more information.)

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

    Notice
    The Grade Sensor and ECA must be calibrated before the vehicle is placed in operation.
    • Turn ignition switch on. Allow Transmission to power up.
    • Turn ignition off. Wait 2 minutes.

ECA Calibration

  1. Start the truck and let the system air up.

  2. With ServiceRanger connected perform Clutch ECA Calibration in Service Routines Option.

Grade Sensor Calibration

  1. Key on, engine off with truck on level ground.

  2. With ServiceRanger connected perform Grade Sensor Calibration in Service Routines Option.