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

DESCRIPTION

When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift state is park (P) and the brake pedal is depressed, the engine can be started by pressing the engine switch. If the steering is unlocked, the engine can also be started by pressing the engine switch with the shift state park (P) and the brake pedal depressed.

Related Data List and Active Test Items
Problem Symptom Data List and Active Test
Engine does not Start

    Power Source Control

  • Stop Light Switch1

  • Steering Unlock Switch

  • Shift P Signal Pulse

  • IG Relay Monitor (Inside)

  • IG Relay Monitor (Outside)

  • Latch Circuit

  • Starter Request Signal

  • Power Supply Condition


    Entry&Start

  • Immobiliser

  • Engine Start Request

  • S Code Check

  • L Code Check


    Starting Control

  • Starter SW

  • Shift Position Status

  • Ignition

WIRING DIAGRAM

B000YONE03

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • If the entry and start system (for Start Function) has been canceled, enable the system before performing troubleshooting.

    Click here

  • Inspect the fuses of circuits related to this system before performing the following procedure.

  • Before replacing the certification ECU (smart key ECU assembly) or an electrical key transmitter sub-assembly, refer to the Service Bulletin.

  • After completing repairs, confirm that the problem does not recur.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

PROCEDURE


  1. CHECK ENGINE CRANKING OPERATION


    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.

    2. Shift state park (P).

    3. Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch and check that the engine cranks.

      Result
      Result Proceed to
      Engine cranks and initial combustion occurs A
      Engine cranks but initial combustion does not occur B
      Engine does not crank C

    A

    GO TO ENTRY AND START SYSTEM (for Start Function) (Immobiliser System does not Operate Properly) Click here

    B

    GO TO SFI SYSTEM w/ Canister Pump Module: GO TO SFI SYSTEM Click here
    GO TO SFI SYSTEM w/o Canister Pump Module: GO TO SFI SYSTEM Click here

    C

  2. CHECK ENGINE SWITCH CONDITION


    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.

    2. Push the P position switch(shift position indication).

    3. With the brake pedal released, check that pressing the engine switch causes the power source mode to change.

      Result
      Result Proceed to
      Power source mode changes : Off → on (ACC) → on (IG) → off A
      Power source mode does not change to on (ACC) or on (IG) B
      Power source mode changes to on (IG) but not to on (ACC) C
      Power source mode changes to on (ACC) but not to on (IG) D

    B

    GO TO ENTRY AND START SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG and ACC)) Click here

    C

    GO TO ENTRY AND START SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG)) Click here

    D

    GO TO ENTRY AND START SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG)) Click here

    A

  3. READ VALUE USING GTS (STOP LIGHT SWITCH1)


    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 / Power Source Control / Data List.

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


      Body Electrical > Power Source Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Switch1 State of brake pedal OFF or ON

      OFF: Brake pedal released

      ON: Brake pedal depressed

      • Use this item to determine if the stop light switch assembly is malfunctioning.

      • The engine cannot be started when this item is OFF.

      • If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

      Body Electrical > Power Source Control > Data List
      Tester Display
      Stop Light Switch1
      OK
      The GTS display changes correctly in response to the brake pedal operation.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  4. READ VALUE USING GTS (SHIFT POSITION P)


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

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


      Body Electrical > Power Source Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift P Signal Pulse P position signal status Normal2, Normal3, Normal4, Normal5 or Unknown

      Normal2: Signal normal and park (P) selected

      Normal3: Signal normal and shift state other than (P)

      Normal4: Signal normal and park (N) selected

      Normal5: Signal normal and park other than (P) or (N) selected

      Unknown: -

      		 Use this item to determine if the P position signal is malfunctioning.

      Body Electrical > Power Source Control > Data List
      Tester Display
      Shift P Signal Pulse
      OK
      The GTS display changes correctly in response to the shift state.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK SHIFT CONTROL ECU (OUTPUT TO CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) Click here

    OK

  5. READ VALUE USING GTS (STARTER REQUEST SIGNAL)


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


      Body Electrical > Power Source Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Starter Request Signal Engine start request signal status OFF or ON

      OFF: The engine switch is not pressed

      ON: With the shift state park (P) and the brake pedal depressed, the engine switch is pressed and held

      • When the engine cannot be started due to a start request signal malfunction, OFF is displayed.

      • When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain period of time.

      Body Electrical > Power Source Control > Data List
      Tester Display
      Starter Request Signal

      Note

      Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch.

      OK
      The GTS display changes correctly in response to the engine switch operation.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK STEERING LOCK Click here

    OK

  6. READ VALUE USING GTS (STARTER SW)


    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.

    2. Shift state park (P).

    3. Enter the following menus: Body Electrical / Starting Control / Data List.

    4. Read the Data List while pressing the engine switch with the brake pedal depressed according to the display on the GTS.


      Body Electrical > Starting Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Starter SW Starter operation request OFF or ON

      OFF: Starter operation not requested

      ON: Starter operation requested

      		 When OFF is displayed, the engine will not crank.

      Body Electrical > Starting Control > Data List
      Tester Display
      Starter SW
      OK
      The GTS display changes.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST NO. 1 RELAY)


    1. B000VM3C03
      *a

      No. 1 Engine Room Relay Block

      (ST No. 1 Relay Installation Terminal)

      Remove the ST NO. 1 relay.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST NO. 1 relay installation terminal 2 - Body ground Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher* → 1.0 V or less

      Tech Tips

      *: While the engine is cranking, the battery voltage may drop to approximately 6 V.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL STAR) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - POWER SUPPLY AND BODY GROUND)


    1. B000VM3C03
      *a

      No. 1 Engine Room Relay Block

      (ST No. 1 Relay Installation Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST NO. 1 relay installation terminal 1 - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST NO. 1 relay installation terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT ST NO. 1 RELAY


    1. Inspect the ST NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST NO. 1 RELAY

    OK

  10. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - STARTER ASSEMBLY)


    1. Disconnect the G48 starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST NO. 1 relay installation terminal 3 - G48-1 (ST) Always Below 1 Ω
      ST NO. 1 relay installation terminal 3 or G48-1 (ST) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - POWER SUPPLY)


    1. B000WT7C02
      *a

      Wire harness connector

      (to Starter Assembly)

      Disconnect the starter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H1-1 (B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STARTER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL STAR)


    1. Install the ST relay NO. 1

    2. B000UL7C24
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A20-9 (STAR) - Body ground Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher* → 1.0 V or less

      Tech Tips

      *: While the engine is cranking, the battery voltage may drop to approximately 6 V.

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL STAR) Click here

  13. CHECK STEERING LOCK


    1. Check that the steering unlocks when the engine switch is turned on (ACC).

      OK
      The steering unlocks.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO ENTRY AND START SYSTEM (for Start Function) (Unable to Unlock Steering Wheel (Engine cannot Start)) Click here

    OK

  14. CHECK SECURITY INDICATOR LIGHT (IMMOBILISER FUNCTION UNSET)


    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.

    2. Push the P position switch (shift position indication).

    3. Press the engine switch with the brake pedal released and check that the security indicator light changes from blinking to off at the same time that the power source mode changes to on (ACC).

      OK
      The security indicator light changes from blinking to off at the same time that the power source mode changes to on (ACC).

      Tech Tips

      The immobiliser function can be determined to be operating correctly if the security indicator light changes from blinking to off at the same time that the power source mode changes to on (ACC).

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    GO TO ENTRY AND START SYSTEM (for Start Function) (Immobiliser System does not Operate Properly) Click here

  15. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL STAR)


    1. Disconnect the A58 ECM connector.

    2. B000UL7C24
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A20-9 (STAR) - Body ground Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher* → 1.0 V or less

      Tech Tips

      *: While the engine is cranking, the battery voltage may drop to approximately 6 V.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

  16. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM)


    1. Disconnect the A20 certification ECU (smart key ECU assembly) connector.

    2. Remove the ST NO. 1 relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A20-9 (STAR) - A20-20 (STA) Always Below 1 Ω
      A20-9 (STAR) - A58-43 (STA) Always Below 1 Ω
      A20-9 (STAR) - ST NO. 1 relay installation terminal 2 Always Below 1 Ω
      A20-9 (STAR) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK SHIFT CONTROL ECU (OUTPUT TO CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Using an oscilloscope, check the waveform.

      B000W98C02
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECUAssembly))

      		 *b Waveform
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      P66-22 (P) - P66-18 (E)

      Procedure:


      1. Engine switch on (IG)

      2. Shift state park (P)

      		 10 V/DIV., 10 ms./DIV.

      Pulse generation

      (See waveform)

      Tech Tips

      The waveform will vary depending on the shift state.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  18. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SHIFT CONTROL ECU)


    1. Disconnect the P66 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the P74 shift control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P66-22 (P) - P74-13 (PPOS) Always Below 1 Ω
      P66-22 (P) or P74-13 (PPOS) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK SHIFT CONTROL ECU


    1. B000TY5C76

      Resconnect the P66 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P66-22 (P) - Other terminals and body ground

      Procedure:


      1. Engine switch on (IG)

      2. Shift state park (P)

      		 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SHIFT CONTROL ECU Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  20. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SUPPLY AND BODY GROUND)


    1. B000XWRC22
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A4-1 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A4-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the X23 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A58 ECM connector.

    3. Disconnect the A10 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the P75 shift control ECU connector.

    5. Disconnect the cable from the negative (-) battery terminal.

    6. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    7. Resconnect the cable from the negative (-) battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X23-25 (STP1) - A4-2 (L) Always Below 1 Ω
      X23-25 (STP1) - A4-2 (L) - Other terminals and body ground Always 10 kΩ or higher

    9. Connect the cable to the negative (-) battery terminal.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  22. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here