Toyota Avalon Service & Repair Manual: Initialization

INITIALIZATION

Inspection After Repair

Perform Learning Value Reset and Idle Learning after replacing or servicing parts related to engine operation. Details on procedures required are indicated by an asterisk and a number, and are explained in detail following the table.

Part Replaced

Engine Operation

Learning Value Reset*1

Idle Learning*2

  • Throttle body with motor assembly*3
  • Cleaning the deposits from the throttle body with motor assembly*3

-

  • Cam timing control motor with EDU assembly
  • Removal and installation of a cam timing control motor with EDU assembly
  • Camshaft timing gear assembly
  • Removal and installation of a camshaft timing gear assembly

-

Engine assembly

-

  • Cylinder head sub-assembly
  • Camshaft (for intake or exhaust camshaft)
  • Camshaft timing exhaust gear assembly
  • Piston or piston ring
  • Mass air flow meter sub-assembly
  • Port fuel injector assembly
  • Direct fuel injector assembly
  • Fuel pump (for low pressure side)
  • Fuel pump assembly (for high pressure side)
  • No. 2 fuel pressure sensor (for low pressure side)
  • Fuel pressure sensor (for high pressure side)
  • Air fuel ratio sensor (sensor 1)
  • Air fuel ratio sensor (sensor 2)
  • Engine coolant temperature sensor
  • Spark plug
  • Ignition coil assembly
  • EGR valve assembly
  • Air leaks from intake system
  • Gas leaks from exhaust system

Confirm the following and perform Learning Value Reset and Idle Learning when one or more of the following conditions is met:

  1. A DTC was output before component replacement.
  2. An air fuel ratio learned value (A/F Learn Value Idle (Port) Bank 1, A/F Learn Value Low (Port) Bank 1, A/F Learn Value Mid No.1 (Port) Bank 1, A/F Learn Value Mid No.2 (Port) Bank 1, A/F Learn Value High (Port) Bank 1, A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1, A/F Learn Value High Bank 1, A/F Learn Value Low (Dual) Bank 1, A/F Learn Value Mid (Dual) No.1 Bank 1, A/F Learn Value Mid (Dual) No.2 Bank 1 or A/F Learn Value High (Dual) Bank 1) displayed in the Data List was higher than +/- 20% before component replacement.
  3. Starting failure or rough idle occurs, or the engine stalls after component replacement.

The none of the conditions in the list above are met.

-

-

Knock control sensor*4

-

-

-

  • ○: Necessary.
  • -: Unnecessary.

NOTICE:

Engine learned values cannot be reset by disconnecting the cable from the negative (-) auxiliary battery terminal or removing the EFI-MAIN NO. 4 fuse.

  • *1: Learning Value Reset
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Utility / Learning Value Reset.
    5. Confirm the following conditions as instructed on the screen.
      • - Power switch on (IG)
      • - Engine stopped
      • - Auxiliary battery voltage is higher than 9 V
    6. After confirming, select "Next" and initialize the learned value.

      HINT:

      If a message indicating learned value initialization failure is displayed on the screen, confirm the execution conditions, and perform learned value initialization again.

    7. After the completion of learned value initialization, confirm the air fuel ratio learned values (A/F Learn Value Idle (Port) Bank 1, A/F Learn Value Low (Port) Bank 1, A/F Learn Value Mid No.1 (Port) Bank 1, A/F Learn Value Mid No.2 (Port) Bank 1, A/F Learn Value High (Port) Bank 1, A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1, A/F Learn Value High Bank 1, A/F Learn Value Low (Dual) Bank 1, A/F Learn Value Mid (Dual) No.1 Bank 1, A/F Learn Value Mid (Dual) No.2 Bank 1 and A/F Learn Value High (Dual) Bank 1) in the Data List.

      If 0% is displayed for all of the air fuel ratio learned values, initialization has completed correctly.

      If a value other than 0% is displayed for one of the air fuel ratio learned values, perform initialization again. After initialization, confirm the air fuel ratio learned values. If a value other than 0% is displayed, replace the ECM.

  • *2: Idle Learning
    1. Turn the power switch off and wait for at least 30 seconds.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here

    5. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
    6. Start the engine and warm it up until the engine coolant temperature is 80°C (176°F) or higher.

      HINT:

      Learning starts when the engine coolant temperature is 80°C (176°F) or higher.

    7. Turn the power switch off, and then on (READY).
    8. With the shift lever in P, lightly depress the accelerator pedal to start the engine.
    9. Wait until the engine stops.

      HINT:

      The engine normally stops within 1 minute. However, when the HV battery SOC is low, the engine may remain running for approximately 3 minutes.

    10. Enter the following menus: Powertrain / Engine / Data List / ISC Learning.
    11. Confirm that "Compl" is displayed on the Techstream screen.
    12. Put the engine in Inspection Mode (Maintenance Mode).

      Click here

    13. Start the engine.
    14. Enter the following menus: Powertrain / Engine / Data List / Engine Speed and Engine Independent.
    15. Check the Engine Speed when the value of Data List item Engine Independent is "Operate".

      Standard:

      Engine Idle Speed

      1050 to 1150 rpm

      HINT:

      • Be sure to perform this step with the A/C switch and all accessories off.
      • Make sure that the shift lever in P.
      • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Check the Engine Speed after charge control is complete ("Operate" is displayed).
  • *3: Perform Learning Value Reset and Idle Learning after replacing the throttle body with motor assembly or cleaning deposits from the throttle body with motor assembly.

    After that, check the idle speed. If the idle speed is out of the specified range, perform the following procedure.

    CAUTION:

    When performing a driving test, obey all speed limits and traffic laws.

    HINT:

    History information for driving and stopping is necessary to update Idle Learning.

    1. Turn the power switch on (IG).
    2. Turn the Techstream on.
    3. Put the engine in Inspection Mode (Maintenance Mode).

      Click here

    4. Warm up the engine (engine coolant temperature of 80°C (176°F) or higher) with the A/C switch and all accessories off [A].
    5. While the engine running, drive the vehicle at a speed of 10 km/h (6 mph) or more [B].

      HINT:

      If the engine stops, further depress the accelerator pedal to restart the engine.

    6. Idle the engine for 20 seconds or more [C].
    7. Repeat procedure [B] and [C].
    8. Enter the following menus: Powertrain / Engine / Data List / Engine Speed and Engine Independent.
    9. Check the Engine Speed when the value of Data List item Engine Independent is "Operate" [D].

      Standard:

      Engine Idle Speed

      1050 to 1150 rpm

      HINT:

      • Be sure to perform this step with the A/C switch and all accessories off.
      • Make sure that the shift lever is in P.
      • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Check the Engine Speed after charge control is complete ("Operate" is displayed).
      • If the idle speed is still out of the specified range, repeat procedure [B] and [C] until the idle speed is within the specified range [E].
  • *4: Drive the vehicle for a short while after replacing the knock control sensor, and check if knocking occurs. If knocking occurs, drive the vehicle until knocking stops.
    Ignition Circuit

    MIL Circuit

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