2020 Subaru Legacy BaseFACTORY OEM SERVICE PROCEDURE

Transmission Control Module (TCM): Installation

CAUTION:
  • When replacing the TCM, be sure to perform [Start count reading ECU to SSM] before operation and perform [Start count writing SSM to ECU] after operation. Refer to AUTO START STOP (DIAGNOSTICS)>Work Support>NOTE .
  • When [Start count reading ECU to SSM] cannot be performed due to TCM malfunction, be sure to replace the starter and fuel pump relay at the same time.

Starter: 

Refer to STARTING/CHARGING SYSTEMS (H4DO)>Starter .

Fuel pump relay: 

Refer to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump Relay .

  1. Install the TCM.

    Tightening torque: 

    7 N.m (0.7 kgf-m, 5.2 ft-lb)

  2. Connect the connector.
    NOTE: Move the lock lever and confirm that a clicking sound is heard.
  3. Install the transmission case cover (front).
    NOTE:
    • Insert the transmission case cover (front) between transmission case cover (rear) and transmission body.
    • When inserting, be careful that the insulator inside transmission case cover is not turned over.
    G11255547Courtesy of SUBARU OF AMERICA, INC.

    Tightening torque: 

    7 N.m (0.7 kgf-m, 5.2 ft-lb)

    • A-type
      G14403546Courtesy of SUBARU OF AMERICA, INC.
    • B-type
      G13603171Courtesy of SUBARU OF AMERICA, INC.
  4. Install the pitching stopper. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>Transmission Mounting System>INSTALLATION>PITCHING STOPPER .
  5. Connect the ground cord.

    Tightening torque: 

    32.3 N.m (3.3 kgf-m, 23.8 ft-lb)

    G13603170Courtesy of SUBARU OF AMERICA, INC.
  6. Install the air intake boot. Refer to INTAKE (INDUCTION) (H4DO)>Air Intake Boot>INSTALLATION .
  7. Connect the ground terminal to battery sensor. Refer to REPAIR CONTENTS>NOTE>BATTERY .
  8. Perform [Clear AT learning value] and [AT learning mode] using the Subaru Select Monitor. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>AT learning .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.