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 NO. 1, IG1 NO.2, IG1 NO. 3, ACC1, ACC2, 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.

      A019PG9E06

WIRING DIAGRAM

A019OUKE02
A019JLQE02

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.

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 intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / each ECU / DTC.

    5. Check for DTCs.

      OK
      DTC is not output.

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    OK

  3. 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 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 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 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.
        Result
        Result Proceed to
        NG A
        OK (for 2GR-FE) B
        OK (for 1AR-FE) C

    B

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

    C

    GO TO SFI SYSTEM (for 1AR-FE) Click here

    A

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A019MCWE11
      Text in Illustration
      *1

      Components without harness connected

      (Park/Neutral Position Switch)

      Disconnect the D8 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D8-4 (B) - D8-9 (L) Shift lever in P or N Below 1 Ω
      D8-4 (B) - D8-9 (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. A019MW3

      Remove the ST relay from the engine room relay block assembly.

    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. A019PLOE12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the F7 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
      F7-3 (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 INTELLIGENT TESTER (STOP LIGHT SWITCH ASSEMBLY)


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

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

      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

    CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SOURCE AND BODY GROUND) Click here

    OK

  10. READ VALUE USING INTELLIGENT TESTER (STEERING UNLOCK SWITCH)


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

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

      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 locked) 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 INTELLIGENT TESTER (L CODE)


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

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

      Smart Key
      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 appears on the screen.

    NG

    GO TO ENGINE IMMOBILISER SYSTEM Click here

    OK

  13. READ VALUE USING INTELLIGENT TESTER (ENGINE START REQUEST)


    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 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 appears on the screen.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  14. 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.

      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 INTELLIGENT TESTER (STARTER REQUEST SIGNAL)


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

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

      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) appear on the screen. (for 2GR-FE) A
      ON (ST relay on) and OFF (ST relay off) appear on the screen. (for 1AR-FE) B
      ON (ST relay on) and OFF (ST relay off) do not appear on the screen (for LHD). C
      ON (ST relay on) and OFF (ST relay off) do not appear on the screen (for RHD). D

    B

    GO TO SFI SYSTEM (for 1AR-FE) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    D

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

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

  16. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SOURCE AND BODY GROUND)


    1. A019OXLE29
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A79 connector from the stop light switch assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A79-1 (B) - A79-3 (GND) Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      A79-3 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. A019LRUE26
      Text in Illustration
      *1

      Component with harness connected

      (Stop Light Switch Assembly)

      Reconnect the A79 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
      A79-2 (L) - A79-3 (GND) Engine switch off, brake pedal not depressed Below 1 V
      A79-2 (L) - A79-3 (GND) Engine switch off, brake pedal depressed 11 to 14 V

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. A019MF3E03
      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)

      Disconnect the F7 connector from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F7-11 (STP1) - A79-2 (L) Always Below 1 Ω
      F7-11 (STP1) - Body ground Always 10 kΩ or higher

    3. Proceed to next step based on the inspection result.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

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


    1. Disconnect the F8 connector from the power management control ECU.

      A019LNFE02

    2. Disconnect the F37 connector from the steering lock actuator assembly (steering lock ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F8-3 (SLP) - F37-4 (SLP1) Always Below 1 Ω
      F8-3 (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 Actuator Assembly (Steering Lock ECU))

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  20. INSPECT STEERING LOCK ACTUATOR ASSEMBLY


    1. A019OLJE24
      Text in Illustration
      *1

      Component with harness connected

      (Steering Lock Actuator Assembly (Steering Lock ECU))

      Reconnect the F37 connector to the steering lock actuator assembly (steering lock ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F37-4 (SLP1) - Body ground Steering locked 10 kΩ or higher
      F37-4 (SLP1) - Body ground Steering unlocked Below 1 Ω

    3. Proceed to next step based on the inspection result.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    C

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

    A

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

  21. 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

  22. READ VALUE USING INTELLIGENT TESTER (STARTER REQUEST SIGNAL)


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

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

      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.

      Result
      Result Proceed to
      ON (ST relay on) and OFF (ST relay off) appear on the screen. A
      ON (ST relay on) and OFF (ST relay off) do not appear on the screen (for LHD). B
      ON (ST relay on) and OFF (ST relay off) do not appear on the screen (for RHD). C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

  23. 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