SMART ENTRY AND START SYSTEM (for Start Function) Engine does not Start

DESCRIPTION


  1. ENGINE START SYSTEM FUNCTION


    1. If the engine switch is pressed with the shift lever in P or N and the brake pedal depressed, the power management control ECU determines that this is an engine start request.

    2. The certification ECU (smart key ECU assembly) and other ECUs perform key verification via LIN communication.

    3. The power management control ECU activates the ACC relay.

    4. The power management control ECU activates the IG1 and IG2 relays.

    5. The certification ECU (smart key ECU assembly) outputs a steering UNLOCK signal. The signal is sent to the power management control ECU via the steering lock ECU.

    6. The power management control ECU activates the starter relay.

      Tech Tips

      When the power management ECU operates the starter relay, it performs cranking holding control.

    7. The power management control ECU deactivates the ACC relay until the power management control ECU detects an engine start.

      Tech Tips

      Whether the engine has started is judged based on the engine speed signals sent from the ECM.

      A01EK1CE06

WIRING DIAGRAM

A01EK6HE01
A01EJHXE06

INSPECTION PROCEDURE


  1. EMERGENCY ENGINE START CONTROL


    1. If there is a malfunction in the stop light switch or STOP fuse, their signals may not be correctly transmitted to the power management control ECU. This may result in the engine not starting even if the engine switch is pressed while the brake pedal is depressed and the shift lever is in P.

      To activate the starter:


      1. Turn the engine switch from off to on (ACC).

      2. Press and hold the engine switch for 15 seconds.

        Tech Tips

        After the certification ECU (smart key ECU assembly), steering lock ECU, and/or ECM are/is replaced, perform the registration procedure for the engine immobiliser system (Refer to Service Bulletin).

PROCEDURE


  1. CHECK IF ENGINE STARTS


    1. Place the electrical key on the driver seat.

    2. Move the shift lever to P.

    3. Depress the brake pedal.

    4. Check that the engine switch indicator light is green. Then press the engine switch to check if the engine starts.

      OK
      Engine can be started.

    NG

    CHECK FOR DTC Click here

    OK

    END (ENGINE START PERMISSION CONDITIONS WERE NOT SATISFIED)

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / each ECU / Trouble Code.

    5. Check for DTCs.

      OK
      DTC is not output.

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    OK

  3. READ VALUE USING GTS (POWER SUPPLY OPEN)


    1. Enter the following menus: Body Electrical / Entry&Start / Data List.

    2. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Supply Open Open in ECU/NG (PAST) or OK

      NG (Past): Open in ECU

      OK: No malfunction

      		 -
      OK
      OK (No malfunction) appears on the screen.

    NG

    GO TO STEERING LOCK SYSTEM Click here

    OK

  4. CHECK POWER SOURCE CONDITION


    1. Check if the power source mode changes.


      1. When the electrical key is inside the vehicle and the shift lever is in P, check that the power source mode changes.

        Result
        Result Proceed to
        OK: off → on (ACC) → on (IG) → off A
        Power source mode does not change to on (IG and ACC) B
        Power source mode does not change to on (IG) C
        Power source mode does not change to on (ACC) D

    B

    GO TO OTHER FLOW CHART (Power Source Mode does not Change to ON (IG and ACC)) Click here

    C

    GO TO OTHER FLOW CHART (Power Source Mode does not Change to ON (IG)) Click here

    D

    GO TO OTHER FLOW CHART (Power Source Mode does not Change to ON (ACC)) Click here

    A

  5. CHECK CRANKING FUNCTION


    1. Check the engine cranking function.


      1. When there is fuel in the fuel tank, the electrical key is inside the vehicle, and the shift lever is in P, check that depressing the brake pedal and pressing the engine switch cranks the engine.

        Result
        Result Proceed to
        Engine does not cranks. A
        Engine cranks. B

    B

    GO TO SFI SYSTEM Click here

    A

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A01EMP6E06
      Text in Illustration
      *1

      Components without harness connected

      (Park/neutral Position Switch Assembly)

      Disconnect the B2 connector from the park/neutral position switch assembly.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B2-4 (B) - B2-9 (L) Shift lever in P or N Below 1 Ω
      B2-4 (B) - B2-9 (L) Shift lever not in P or N 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR ST RELAY OR PARK/NEUTRAL POSITION SWITCH Click here

    OK

  7. INSPECT STARTER RELAY ASSEMBLY


    1. A01ELIA

      Remove the ST relay from the engine room relay block.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR ST RELAY OR PARK/NEUTRAL POSITION SWITCH Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. A01EIV4E04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D42 connector from the power management control ECU.

    2. The shift lever is in P or N.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D42-3 (STAR) - Body ground Always 93.8 to 136.4 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR ST RELAY OR PARK/NEUTRAL POSITION SWITCH Click here

    OK

  9. READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)


    1. Enter the following menus: Body Electrical / Power Source Control / Data List.

    2. Read the Data List according to the display on the GTS.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Switch1 Stop light switch 1/ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -
      OK
      ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.

    NG

    Click here

    OK

  10. READ VALUE USING GTS (STEERING UNLOCK SWITCH)


    1. Enter the following menus: Body Electrical / Power Source Control / Date List.

    2. Read the Data List according to the display on the GTS.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Steering Unlock Switch Steering unlock condition/ON or OFF

      ON: Steering is unlocked

      OFF: Steering is locked

      		 -
      OK
      ON (steering is unlocked) and OFF (steering is unlocked) appear on the screen.

    NG

    Click here

    OK

  11. CHECK STEERING LOCK


    1. Turn the engine switch from off to on (ACC) and check that the steering lock moves to the unlocked position when the engine switch is on (ACC).

      OK
      Lock moves to unlocked position.

    NG

    GO TO STEERING LOCK SYSTEM Click here

    OK

  12. READ VALUE USING GTS (L CODE)


    1. Enter the following menus: Body Electrical / Entry&Start / Data List.

    2. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      L Code Check L code certification result/OK or NG

      OK: L code certification result normal

      NG: L code certification result abnormal

      		 -
      OK
      OK appear on the screen.

    NG

    GO TO ENGINE IMMOBILISER SYSTEM Click here

    OK

  13. READ VALUE USING GTS (ENGINE START REQUEST)


    1. Enter the following menus: Body Electrical / Entry&Start / Data List.

    2. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Start Request Start request signal response/OK or NG

      OK: Start request condition signal received

      NG: Start request condition signal not received

      		 -
      OK
      OK appear on the screen.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  14. READ VALUE USING GTS (S CODE)


    1. Enter the following menus: Body Electrical / Entry&Start / Data List.

    2. Read the Data List according to the display on the GTS.

      Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      S Code Check S code certification result/OK or NG

      OK: S code certification result normal

      NG: S code certification result abnormal

      		 -
      OK
      OK (S code certification result normal) appears on the screen.

    NG

    GO TO ENGINE IMMOBILISER SYSTEM Click here

    OK

  15. READ VALUE USING GTS (STARTER REQUEST SIGNAL)


    1. Enter the following menu: Body Electrical / Power Source Control / Data List.

    2. Read the Data List according to the value(s) in the table below.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Specified Condition
      Starter Request Signal Starter request signal monitor/ON or OFF

      ON: ST relay is ON

      OFF: ST relay is OFF

      		 Engine switch pressed and held with shift lever in P or N
      Result
      Result Proceed to
      ON (ST relay on) and OFF (ST relay off) do not appear on the screen. A
      ON (ST relay on) and OFF (ST relay off) appear on the screen. B

    B

    GO TO SFI SYSTEM Click here

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  16. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A01EIVME03

      Remove the stop light switch assembly Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Pushed 10 kΩ or higher
      3 - 4 Pushed 10 kΩ or higher
      1 - 2 Not pushed Below 1 Ω
      3 - 4 Not pushed Below 1 Ω

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  17. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the D42 connector from the power management control ECU.

      A01ELFOE06

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D42-11 (STP1) - A35-1 Always Below 1 Ω
      D42-11 (STP1) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

    3. Reconnect the D42 connector to the power management control ECU.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D42-11 (STP1) - Body ground Brake pedal released Below 1 V
      D42-11 (STP1) - Body ground Brake pedal depressed Output voltage at terminal AM21 or AM22 -2.5 V or more

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  18. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU)


    1. Disconnect the D43 connector from the power management control ECU.

      A01EMS1E01

    2. Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D43-3 (SLP) - D17-4 (SLP1) Always Below 1 Ω
      D43-3 (SLP) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Steering Lock ECU (Steering Lock Actuator Assembly))

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU)

    OK

  19. INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


    1. A01EMIYE22
      Text in Illustration
      *1

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))

      Reconnect the D17 connector to the steering lock ECU (steering lock actuator assembly).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D17-4 (SLP1) - Body ground Steering lock 10 kΩ or higher
      D17-4 (SLP1) - Body ground Steering unlock Below 1 Ω

    NG

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  20. REPAIR OR REPLACE HARNESS OR CONNECTOR OR ST RELAY OR PARK/NEUTRAL POSITION SWITCH


    1. Replace with a new or normally functioning part. Repair or replace any damaged wire harness or connector.


    NEXT

  21. READ VALUE USING GTS (STARTER REQUEST SIGNAL)


    1. Enter the following menus: Body Electrical / Power Source Control / Data List.

    2. Read the Data List according to the display on the GTS.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Starter Request Signal Starter request signal monitor/ON or OFF

      ON: ST relay is on

      OFF: ST relay is off

      		 -

      Note

      Check that the engine switch indicator is illuminated in green and push the engine switch.

      OK
      ON (ST relay on) and OFF (ST relay off) appear on the screen.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  22. CHECK IF ENGINE STARTS


    1. Place the electrical key on the driver seat.

    2. Move the shift lever to P.

    3. Depress the brake pedal.

    4. Check that the engine switch indicator light is green. Then press the engine switch to check if the engine starts.

      OK
      Engine can be started.

    NG

    CHECK HARNESS AND CONNECTOR (MALFUNCTION IN RELAY CONTACT SIDE CIRCUIT)

    OK

    END