AUTOMATIC TRANSAXLE SYSTEM SYSTEM DESCRIPTION


  1. SYSTEM DESCRIPTION


    1. The Electronic Controlled Automatic Transaxle (ECT) is an automatic transaxle that has its shift timing electronically controlled by the ECM. The ECM detects electrical signals that indicate engine and driving conditions, and controls the shift point based on driver's habits and road conditions. As a result, fuel efficiency and transaxle performance are improved.

      Shift shock has been reduced by controlling the engine and transaxle simultaneously.

      In addition, the ECT has features such as:


      • Diagnostic function.

      • Fail-safe function for use when a malfunction occurs.

  2. OIL PUMP ASSEMBLY WITH MOTOR OPERATION CONTROL (w/ Stop and Start System)


    1. When the engine is stopped automatically by the stop and start system, the engine stop and start ECU operates the oil pump assembly with motor installed to the automatic transaxle to produce optimal ATF pressure for enhanced response of the automatic transaxle assembly and smooth start-off when the engine is automatically restarted.

      Tech Tips


      • Refer to the stop and start system operation conditions.

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      • The oil pump assembly with motor operates when the ATF temperature is between 25 and 113°C (77 and 235.4°F).

      • When the shift lever is in P, R or N, the engine will not be stopped by the stop and start system.

    2. Check oil pump assembly with motor operation


      1. Connect the GTS to the DLC3.

      2. Turn the engine switch on (IG).

      3. Turn the GTS on.

      4. Enter the following menus: Powertrain / Stop and Start / Data List.

      5. According to the display on the GTS, read the Data List.


        Powertrain > Stop and Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Oil Pump Status Oil pump assembly with motor status ON / OFF

        ON: Oil pump assembly with motor operating

        OFF: Oil pump assembly with motor not operating

        		 ON is displayed while the engine is stopped by stop and start control

        Powertrain > Stop and Start > Data List
        Tester Display
        Oil Pump Status
        Oil Pump Assembly with Motor Operation
        Shift Lever Position P R N D or M
        Brake Pedal Depressed Does not operate Does not operate Does not operate Operates
        Brake Pedal Released Does not operate Does not operate Does not operate Operates → Does not operate*

        • *: The oil pump assembly with motor will operate until the ATF pressure of the front oil pump body sub-assembly installed in the automatic transaxle assembly becomes higher than the ATF pressure of the oil pump assembly with motor.