STOP AND START SYSTEM Stop and Start Priority Control System

DESCRIPTION

The stop and start control system includes Standard and stop and start priority (Extended) modes. The stop and start control mode can be changed at will by pressing and holding the stop and start cancel switch (warning canceling switch assembly).

When the stop and start control mode has been changed, a signal is sent directly from the stop and start cancel switch (warning canceling switch assembly) to the engine stop and start ECU, and based on the selected control mode, the engine stop and start ECU performs control in coordination with the air conditioning amplifier assembly.

When stop and start priority mode (Extended) is selected, when the air conditioner is ON, the stop and start operation time is extended compare to Standard mode in order to increase fuel efficiency.

WIRING DIAGRAM

A01VDUWE02

CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU Click here.

  • After replacing the engine stop and start ECU or air conditioning control assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU Click here.

  • After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU Click here.

Tech Tips


  • When stop and start priority mode (Extended) is selected, the operation of the air conditioning system is limited. If there are complaints from a customer about poor performance of air conditioning system, check the selected control mode. If stop and start priority control (Extended) is selected, cancel the control mode and check if the cooling effectiveness of the air conditioning system improves. If it improves, explain to the customer that the operation of the air conditioning system was limited by stop and start control.

  • Depending on the vehicle conditions, the stop and start operation time may not change even if stop and start priority control (Extended) is selected.

PROCEDURE


  1. CHECK PROBLEM SYMPTOMS


    1. Check the problem symptoms.

      Tech Tips


      • Check each symptom by checking the suspected areas in the table below.

      • By using the GTS and entering the following menus, the selected mode can be confirmed.

        Powertrain / Stop and Start / Data List / Stop & Start A/C Mode

      Result
      Problem Symptoms Trouble Area Proceed to
      When the stop and start cancel switch (warning canceling switch assembly) is pressed and held, the control mode does not change.

      • Stop and start cancel switch (warning canceling switch assembly)

      • Wire harness or connector

      • Air conditioning amplifier assembly

      		 A
      Control mode returns to default mode after turning ignition switch to ON Engine stop and start ECU B

    B

    CHECK DTC OUTPUT Click here

    A

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTCs are not output A
      CAN communication DTCs are output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. READ VALUE USING GTS (CANCEL SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check the values by referring to the table below.

      Stop and Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Cancel Switch

      Stop and start cancel switch (warning canceling switch assembly) signal /

      ON/OFF

      ON: Stop and start cancel switch (warning canceling switch assembly) pressed

      OFF: Stop and start cancel switch (warning canceling switch assembly) not pressed

      		 -
      Result
      Result Proceed to
      GTS display changes when the cancel button is pressed A
      GTS display does not change even when the cancel button is pressed B

    B

    GO TO STOP AND START CANCEL SWITCH CIRCUIT Click here

    A

  4. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioner amplifier assembly with a new or known good one Click here.

      OK
      The operation returns to normal.

      Tech Tips

      If the stop and start priority mode (Extended) is selected, engine stop time becomes longer than the normal mode (Standard).


    OK

    END

    NG

    REPLACE ENGINE STOP AND START ECU Click here

  5. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here