Last Modified: 12-11-2024 6.11:8.1.0 Doc ID: RM100000002OT6E
Model Year Start: 2025 Model: GR Corolla Prod Date Range: [09/2024 -           ]
Title: UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: INITIALIZATION; 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]

INITIALIZATION

RESET TRANSAXLE COMPENSATION CODE

NOTICE:

  • If the following parts have been replaced, initialize the ECM, perform Reset Memory and Perform Road Test to Allow ECM to Learn.
    • ECM (When transaxle compensation code cannot be transferred.)
    • Transmission valve body assembly
    • Solenoid (SL1) valve
    • Solenoid (SL2) valve
    • Solenoid (SL3) valve
    • Solenoid (SL4) valve
    • Solenoid (SL5) valve
    • Solenoid (SL6) valve
  • The transaxle compensation code can only be initialized with the GTS.

HINT:

The ECM (ECT) memorizes the vehicle conditions when controlling the automatic transaxle assembly and engine assembly.

Therefore, if the automatic transaxle assembly or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information. The reset procedure is as follows:

(a) Make sure the shift lever is in P or N.

(b) Enter the following menus: Powertrain / Transmission / Utility / A/T Code Reset.

Powertrain > Transmission > Utility

Tester Display

A/T Code Reset

(c) Press "Next" again to proceed.

NOTICE:

After the transaxle compensation code is initialized, perform Reset Memory and Perform Road Test to Allow ECM to Learn.

(d) Press "Exit".

RESET MEMORY

NOTICE:

  • Perform Reset Memory (AT initialization) after replacing the automatic transaxle assembly, transmission valve body assembly or any of the solenoid (SL1, SL2, SL3, SL4, SL5 and/or SL6) valves.
  • Reset Memory can only be performed with the GTS.
  • Reset Memory cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal.

HINT:

The ECM (ECT) memorizes the vehicle conditions when controlling the automatic transaxle assembly and engine assembly.

(a) Enter the following menus: Powertrain / Transmission / Utility / Reset Memory.

Powertrain > Transmission > Utility

Tester Display

Reset Memory

(b) Press "Next".

NOTICE:

After performing Reset Memory, be sure to perform Perform Road Test to Allow ECM to Learn.

PERFORM ROAD TEST TO ALLOW ECM TO LEARN

CAUTION:

  • Perform the following procedures while strictly observing all traffic laws and speed limits.
  • Since there is a possibility that the road test may exceed the legal speed limit, make sure to perform the road test to allow the ECM to learn within the legal speed limit, and then return the vehicle.

NOTICE:

  • The following procedure is part of learning, and it is necessary to drive the vehicle using all gears in order to complete all learning.
  • Do not accelerate or decelerate rapidly.
  • This test must be performed after checking and adjusting the engine.
  • Perform at a transaxle fluid temperature of 50 to 100°C (122 to 212°F).
  • Since learning is performed when up-shifting during slow acceleration and when down-shifting during slow deceleration, learning completes even if each learning is performed separately due to the road conditions.

(a) The "road test" procedure is as follows:

(1) Warm up the engine.

(2) According to the replaced parts, perform the appropriate road test shown below.

Replaced Parts

Road Test
  • Automatic transaxle assembly
  • ECM
  • Transmission valve body assembly
  • Solenoid (SL1) valve
  • Solenoid (SL2) valve
  • Solenoid (SL3) valve
  • Solenoid (SL4) valve
  • Solenoid (SL5) valve
  • Solenoid (SL6) valve
  • Engine assembly

Perform pattern

  • With the shift lever in D, gradually accelerate the vehicle to 5th gear or to 60 km/h (37 mph), and then gradually decelerate to 0 km/h (0 mph, vehicle stopped).

HINT:

  • After gradually accelerating over a distance of approximately 270 m (885.8 ft.) for a period of approximately 25 seconds, gradually decelerate over a distance of approximately 250 m (820.2 ft.) for a period of approximately 25 seconds.
  • When decelerating, apply the brakes as necessary to adjust the vehicle speed.
  • Shift shock or engine speed overrun (engine speed flare when shifting) may occur for a while after the vehicle is returned; however, this is not a malfunction as it is due to shift learning.

NOTICE:

  • *1: The speed, time and distance values are approximate values.
  • *2: After accelerating, deceleration does not need to be performed immediately.

(3) Repeat the road test until the shift shock and engine speed overrun (engine speed flare when shifting) reach an acceptable level.

NOTICE:

  • When repeating the acceleration/deceleration cycle of a road test pattern, bring the vehicle to a complete stop before accelerating again.
  • In order to complete all learning, it is necessary to drive using all gears.

PERFORM ATF THERMAL DEGRADATION ESTIMATE RESET

NOTICE:

If either of the following conditions is met, perform ATF Thermal Degradation Estimate Reset:

  • The ATF has been replaced.

    HINT:

    If 50000 or more is displayed for the Data List item "ATF Thermal Degradation Estimate", thermal degradation of the ATF is suspected. Perform ATF Thermal Degradation Estimate Reset after replacing the ATF.

  • Approximately 50% or more of the ATF has been replaced during a repair of the transaxle or a similar operation.

(a) With the shift lever in P, turn the ignition switch to ON.

NOTICE:

Do not start the engine.

(b) According to the display on the GTS, initialize the estimated thermal degradation value.

Powertrain > Transmission > Utility

Tester Display

ATF Thermal Degradation Estimate Reset