HYBRID CONTROL SYSTEM Loud Rattle from Hybrid Vehicle Transmission

DESCRIPTION

When the auxiliary battery is replaced or the cable is disconnected from its negative (-) battery terminal, the ISC learning value will be initialized and symptoms as a noise from the hybrid vehicle transaxle assembly may occur until ISC learning is performed.

Therefore, perform ISC learning when the auxiliary battery is replaced or the cable is disconnected from the negative (-) auxiliary battery terminal.

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ISC LEARNING)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Power train / Engine and ECT / Data List / ISC Learning.

    5. Read the display on the intelligent tester.

      Result
      Tester Display Result Proceed to
      ISC Learning Incmpl A
      Compl B

    B
    A
  2. INITIALIZATION (ISC LEARNING)


    1. Enter inspection mode (maintenance mode) Click here.

    2. Enter the following menus: Power train / Hybrid Control / Data List / Engine Coolant Temp.

    3. Turn the power switch on (READY) and warm up the engine coolant temp displayed in the Data List becomes 70°C (158°F) or more.

    4. Turn the power switch off and then on (READY) again.

    5. Check that the engine coolant temperature displayed in the Data List is 70°C (158°F) or more.

    6. With park (P) selected, lightly depress the accelerator pedal to start the engine.

    7. Wait until the engine stops.

      Tech Tips

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

    8. Enter the following menus: Power train / Engine and ECT / Data List / ISC Learning.

    9. Read the display on the intelligent tester.

      Result
      Tester Display Result Proceed to
      ISC Learning Incmpl A
      Compl B

    B
    A