Toyota Avalon Service & Repair Manual: Initialization

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 Techstream.

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) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

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

Powertrain > Transmission > Utility

Tester Display

A/T Code Reset

(f) 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.

(g) 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 Techstream.
  • 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) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

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

Powertrain > Transmission > Utility

Tester Display

Reset Memory

(e) 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.
  • Do not accelerate or decelerate rapidly.

(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, after gradually accelerating to 85 km/h (53 mph) or more, gradually decelerate to approximately 20 km/h (12 mph).

HINT:

  • After gradually accelerating over a distance of approximately 220 m (721.9 ft.) for a period of approximately 20 seconds, gradually decelerate over a distance of approximately 200 m (656.2 ft.) for a period of approximately 20 seconds.
  • When decelerating, apply the brakes as necessary to adjust the vehicle speed.

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.

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) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) With the shift lever in P, turn the engine switch on (IG).

NOTICE:

Do not start the engine.

(d) Turn the Techstream on.

(e) Enter the following menu: Powertrain / Transmission / Utility / ATF Thermal Degradation Estimate Reset.

Powertrain > Transmission > Utility

Tester Display

ATF Thermal Degradation Estimate Reset

(f) According to the display on the Techstream, initialize the estimated thermal degradation value.

    Hydraulic Test

    Manual Shifting Test

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