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 main body ECU determines that it is an engine start request.

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

    3. The main body ECU activates the ACC relay.

    4. The main body ECU activates the IG1 and IG2 relays.

    5. The certification ECU (smart key ECU assembly) sends a steering UNLOCK signal. The signal is sent to the main body ECU via the steering lock actuator assembly (steering lock ECU).

    6. The main body ECU sends an engine start request signal to the ECM.

    7. The ECM sends an ACC cut request signal to the main body ECU.

    8. The ECM and main body ECU activate the ST relay.

    9. The main body ECU deactivates the ACC relay until the main body ECU detects that the engine has started.

    A01CC7FE12
    A01CEJ7E16

WIRING DIAGRAM

Refer to Cranking Holding Function Circuit (for 2GR-FE: Click here, for 2AZ-FE: Click here.

INSPECTION PROCEDURE


  1. EMERGENCY ENGINE START CONTROL


    1. If there is a malfunction in the stop light switch assembly or STOP fuse, the signals may not be correctly transmitted to the main body 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 actuator assembly (steering lock ECU), ID code box (immobiliser code ECU) and/or ECM are/is replaced, perform the registration procedure for the engine immobiliser system.

PROCEDURE


  1. CHECK IF ENGINE STARTS (INITIALIZE STEERING LOCK)


    1. Move the shift lever to P.

    2. Open and close the driver door with the engine switch off.

    3. Check if the engine can be started.

      OK
      Engine can be started.

      Tech Tips

      After the battery is discharged and then recharged or replaced, the engine may not start unless the steering lock is initialized using the above procedure.


    NG

    CHECK THE ENGINE SWITCH CONDITION Click here

    OK

    END (INITIALIZATION WAS NOT COMPLETED)

  2. CHECK THE ENGINE SWITCH CONDITION


    1. Check if the power source mode changes.


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

        OK
        off → on (ACC) → on (IG) → off

    NG

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

    OK

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs again.

      Result
      Result Proceed to
      No DTC is output A
      Smart entry and start system (for start function) DTCs are output B
      Steering lock system DTCs are output C
      Engine immobiliser system DTCs are output D
      Vehicle stability control system DTCs are output E

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    C

    GO TO STEERING LOCK SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    D

    GO TO ENGINE IMMOBILISER SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    E

    GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  4. CHECK CRANKING FUNCTION


    1. Check the engine cranking function.


      1. When there is fuel in the fuel tank, the 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 crank A
        Engine cranks (for 2GR-FE) B
        Engine cranks (for 2AZ-FE) C

    B

    GO TO SFI SYSTEM (for 2GR-FE) Click here

    C

    GO TO SFI SYSTEM (for 2AZ-FE) Click here

    A

  5. READ VALUE USING INTELLIGENT TESTER (STARTER CONTROL)


    1. Connect the intelligent tester to the DLC3.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5-second intervals or less until communication between the intelligent tester and vehicle starts.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine / Data List.

    5. Depress the brake pedal.

    6. Move the shift lever to P or N.

    7. Read the Data List according to the display on the intelligent tester.

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Starter Control Starter switch signal / ON or OFF

      ON: Starter activated using engine switch

      OFF: Starter not activated

      		 -
      Result
      Result Proceed to
      ON and OFF appear on the screen. A
      ON and OFF do not appear on the screen. (for 2GR-FE) B
      ON and OFF do not appear on the screen. (for 2AZ-FE) C

    B

    GO TO SFI SYSTEM (for 2GR-FE) Click here

    C

    GO TO SFI SYSTEM (for 2AZ-FE) Click here

    A

  6. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH ASSEMBLY)


    1. Enter the following menus: Body / Main Body / Data List.

    2. Read the Data List according to the display on the intelligent tester.

      Main Body
      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

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  7. READ VALUE USING INTELLIGENT TESTER


    1. Enter the following menus: Body / Main Body / Data List.

    2. Read the Data List according to the displays on the tester screen.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Neutral SW Park/Neutral position switch assembly / ON or OFF

      ON: Shift lever in P or N

      OFF: Shift lever not in P nor N

      		 -
      OK
      ON (shift lever in P or N) and OFF (shift lever not in P nor N) appear on the screen.

    NG

    INSPECT ST RELAY Click here

    OK

  8. READ VALUE USING INTELLIGENT TESTER (S CODE)


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

    2. Read the Data List according to the display on the intelligent tester.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5-second intervals or less until communication between the tester and vehicle starts.

    3. Turn the engine switch on (IG).

      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

    REGISTER RECOGNITION CODE (ECU CODE) Click here

    OK

  9. READ VALUE USING INTELLIGENT TESTER (L CODE)


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

    2. Read the Data List according to the display on the intelligent tester.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5-second intervals or less until communication between the tester and vehicle starts.

    3. Turn the engine switch on (IG).

      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 (L code certification result normal) appears on the screen.

    NG

    REGISTER RECOGNITION CODE (ECU CODE) Click here

    OK

  10. READ VALUE USING INTELLIGENT TESTER


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

    2. Read the Data List according to the display on the intelligent tester.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Specified Condition
      Immobiliser Immobiliser system status / SET or UNSET

      UNSET: Engine switch on

      SET: Without key

      		 -
      OK
      UNSET (engine switch on) appears on the screen.

    NG

    READ VALUE USING INTELLIGENT TESTER Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)


    1. Disconnect the G51 connector from the main body ECU.

    2. Disconnect the A8 connector from the ECM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-4 (STSW) - A8-14 (STSW) Always Below 1 Ω
      G51-4 (STSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - ECM)

    OK

  12. CHECK MAIN BODY ECU


    1. A01CG7FE04
      Text in Illustration
      *1

      Component with harness connected

      (Main Body ECU)

      Reconnect the G51 connector to the main body ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G51-4 (STSW) - Body ground Brake pedal depressed, engine switch hold on (ST) Output voltage is within 2 V of the voltage measured at AM1 or AM2.
      Result
      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 2AZ-FE) B
      NG C

    B

    REPLACE ECM (for 2AZ-FE) Click here

    C

    REPLACE MAIN BODY ECU Click here

    A

    REPLACE ECM (for 2GR-FE) Click here

  13. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A01CBYTE05
      Text in Illustration
      *1

      Component without harness connected

      (Stop Light Switch Assembly)
      *2 Not Pushed (Free)
      *3 Pushed

      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
      1 - 2 Not pushed Below 1 Ω

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - MAIN BODY ECU)


    1. Disconnect the 4K connector from the main body ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4K-7 (STP) - A1-1 Always Below 1 Ω
      4K-7 (STP) or A1-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - MAIN BODY ECU)

    OK

  15. CHECK HARNESS AND CONNECTOR (BATTERY - STOP LIGHT SWITCH ASSEMBLY)


    1. Reconnect the A1 connector to the stop light switch assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4K-7 (STP) - Body ground Brake pedal depressed 11 to 14 V
      4K-7 (STP) - Body ground Brake pedal released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STOP LIGHT SWITCH ASSEMBLY)

    OK

    REPLACE MAIN BODY ECU Click here

  16. INSPECT ST RELAY


    1. A01CC90E23

      Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 93.8 to 136.4 Ω at 20°C (68°F)
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ST RELAY

    OK

  17. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A01CCDGE26
      Text in Illustration
      *1

      Component without harness connected

      (Park/Neutral Position Switch Assembly)

      for U660E, K112


      1. Disconnect the D3 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
      D3-4 (B) - D3-9 (L) P or N Below 1 Ω
      D3-4 (B) - Body ground Always 10 kΩ or higher
    2. A01CCDGE27
      Text in Illustration
      *1

      Component without harness connected

      (Park/Neutral Position Switch Assembly)

      for U241E


      1. Disconnect the D3 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
      D3-4 (B) - D3-5 (L) P or N Below 1 Ω
      D3-4 (B) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for U660E) B
      NG (for K112) C
      NG (for U241E) D

    B

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (for U660E) Click here

    C

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (for K112) Click here

    D

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (for U241E) Click here

    A

  18. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G48-8 (STR) - D3-4 (B) Always Below 1 Ω
      G48-8 (STR) or D3-4 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

    OK

  19. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY)


    1. for U660E, K112


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        D3-9 (L) - No. 1 engine room relay block ST relay terminal 1 Always Below 1 Ω
        D3-9 (L) - Body ground Always 10 kΩ or higher

    2. for U241E


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        D3-5 (L) - No. 1 engine room relay block ST relay terminal 1 Always Below 1 Ω
        D3-5 (L) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY)

    OK

    REPLACE MAIN BODY ECU Click here

  20. REGISTER RECOGNITION CODE (ECU CODE)


    1. Register the recognition code (ECU code).


    NEXT

  21. CHECK IF THE ENGINE STARTS


    1. Check the engine cranking function.


      1. When there is fuel in the fuel tank, the 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.

        OK
        Engine cranks.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END

  22. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly).


    NEXT

  23. REGISTER RECOGNITION CODE (ECU CODE)


    1. Register the recognition code (ECU code).


    NEXT

  24. CHECK IF ENGINE STARTS


    1. Check the engine cranking function.


      1. When there is fuel in the fuel tank, the 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.

        OK
        Engine cranks.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END

  25. REGISTER RECOGNITION CODE (ECU CODE)


    1. Register the recognition code (ECU code).


    NEXT

  26. CHECK IF ENGINE STARTS


    1. Check the engine cranking function.


      1. When there is fuel in the fuel tank, the 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.

        OK
        Engine cranks.

    NG

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

    OK

    END

  27. REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)


    1. Replace the steering lock actuator assembly (steering lock ECU) Click here.


    NEXT

  28. REGISTER RECOGNITION CODE (ECU CODE)


    1. Register the recognition code (ECU code).


    NEXT

  29. CHECK IF ENGINE STARTS


    1. Check the engine cranking function.


      1. When there is fuel in the fuel tank, the 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.

        OK
        Engine cranks.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END

  30. READ VALUE USING INTELLIGENT TESTER


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

    2. Read the Data List according to the display on the intelligent tester.

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

      OK: Received

      NG: Not received

      		 -
      OK
      OK (Received) appears on the screen.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)