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

DESCRIPTION

When the electrical key transmitter sub-assembly is in the vehicle and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. In addition, when the shift lever is in P or N and the brake pedal is depressed, the engine can be started by pressing the engine switch.

Tech Tips


  • When the certification ECU (smart key ECU assembly) is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode changes to on (IG).

  • When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

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

    Power Source Control

  • Stop Light Switch1

  • Steering Unlock Switch

  • Power Supply Condition

  • IG Relay Monitor (Inside)

  • IG Relay Monitor (Outside)

  • Latch Circuit

  • Shift P Signal

  • Neutral SW/ Clutch SW

  • Starter Request Signal


    Entry&Start

  • Immobiliser

  • S Code Check

  • L Code Check

  • Engine Start Request


    Starting Control

  • Ignition

  • Starter SW

  • Shift Position P or N

 -

WIRING DIAGRAM

Refer to "System Diagram" Click here

INSPECTION PROCEDURE

Note


  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). 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.

  • The smart entry and start system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

  • If the smart entry and start system is disabled through the customize function, enable the system before performing troubleshooting Click here.

  • Before replacing the certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator assembly), ECM or ID code box (immobiliser code ECU), refer to the smart entry and start system (for Start Function) precaution Click here.

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

  • If the steering lock ECU (steering lock actuator assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering by pressing the engine switch. This prevents the engine from starting while the steering is locked.

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

Tech Tips

If the brake pedal is repeatedly depressed while the engine is stopped, the brake booster pressure is released and the force required to depress the brake pedal to illuminate the stop lights increases.

PROCEDURE


  1. CHECK TRANSMITTER BATTERY


    1. Press a switch of the electrical key transmitter sub-assembly and check that the transmitter LED illuminates.

      OK
      The electrical key transmitter sub-assembly LED illuminates.

    NG

    INSPECT TRANSMITTER BATTERY Click here

    OK

  2. READ VALUE USING GTS (KEY LOW BATTERY)


    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 / Entry&Smart / Data List.

    5. According to the display on the GTS, read the Data List.

      Entry&Smart
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key Low Battery Transmitter battery depleted/Yes or No

      Yes: Transmitter battery depleted

      No: Transmitter battery not depleted

      The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. The certification ECU (smart key ECU assembly) displays "Yes" for the "Key Low Battery" item of the Data List when this voltage information indicates 2.2 V or less.

      This Data List item should be checked when the electrical key transmitter sub-assembly is at room temperature (example: at -20°C (-4°F), "Yes" may be displayed even if the transmitter battery is new).
      OK
      "NO" is displayed in the Data List.

    NG

    REPLACE TRANSMITTER BATTERY Click here

    OK

  3. CHECK WAVE ENVIRONMENT


    1. If the problem occurs in certain locations or times of day, the possibility of wave interference is high.

      Tech Tips

      Whether or not the problem is due to wave interference can be checked by holding the electrical key transmitter sub-assembly near the door control receiver (RF band).

      OK
      Engine starts.

    NG

    CHECK ENGINE SWITCH CONDITION Click here

    OK

    AFFECTED BY WAVE INTERFERENCE

  4. CHECK ENGINE SWITCH CONDITION


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

    2. Move the shift lever to P.

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

      Result
      Result Proceed to
      Off → on (ACC) → on (IG) → off A
      Power source mode does not change to on (ACC) and 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 POWER SOURCE MODE DOES NOT CHANGE TO ON (IG AND ACC) Click here

    C

    GO TO POWER SOURCE MODE DOES NOT CHANGE TO ON (IG) Click here

    D

    GO TO POWER SOURCE MODE DOES NOT CHANGE TO ON (ACC) Click here

    A

  5. READ VALUE USING GTS (NEUTRAL SW/ CLUTCH SW, SHIFT POSITION P OR N)


    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 or Starting Control / Data List.

    5. According to the display on the GTS, read the Data List.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Neutral SW/ Clutch SW Shift position (P and N)/ON or OFF

      ON: Shift lever in P or N

      OFF: Shift lever in any position other than P or N

      • Use this item to determine whether the park/neutral position switch is malfunctioning.

      • When the engine cannot be started due to a park/neutral position switch malfunction, OFF is displayed.
      Starting Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Shift Position P or N Park/neutral position switch status/ON or OFF

      ON: Shift lever in P or N

      OFF: Shift lever in any position other than P or N

      		 When malfunctioning, the engine will not crank.
      OK
      The item in the Data List changes according to the shift position.

    NG

    CHECK PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  6. CHECK FOR DTC


    1. Using the GTS, confirm the output of DTCs for all systems.

      OK
      No DTCs are output.

      Note

      Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.


    NG

    GO TO DTC CHART

    OK

  7. 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. According to the display on the GTS, read the Data List.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Switch1 State of brake pedal/ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

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

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

      • When this item is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.
      OK
      The item in the Data List changes when the brake pedal is depressed and released.

    NG

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  8. READ VALUE USING GTS (STARTER REQUEST SIGNAL)


    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. According to the display on the GTS, read the Data List.

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

      ON: With the shift lever in P and brake pedal depressed, the engine switch is pressed and held

      OFF: After approx. 1 sec. has elapsed, the engine switch is released

      • 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 amount of time.

      Note


      • Smart warning light indicator type:

        Check that the smart warning light is illuminated in green on the combination meter assembly, and then press the engine switch.

      • Multi-information display (optitron meter) type:

        Check that the smart warning light is illuminated in green on the combination meter assembly and the "DEPRESS BRAKE PEDAL AND PUSH ENGINE SWITCH TO START" message is displayed on the multi-information display on the combination meter assembly, and then press the engine switch.

      OK
      The display changes in response to the operation of the engine switch.

    NG

    READ VALUE USING GTS (STARTER SW) Click here

    OK

  9. CHECK STEERING LOCK


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

      OK
      The steering unlocks.

    NG

    GO TO STEERING LOCK SYSTEM (UNABLE TO UNLOCK STEERING WHEEL) Click here

    OK

  10. CHECK SECURITY INDICATOR LIGHT (ENGINE IMMOBILISER SYSTEM UNSET)


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

    2. Move the shift lever to P.

    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).

      Tech Tips

      It is determined that the engine immobiliser function is 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).

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

    NG

    GO TO ENGINE IMMOBILISER SYSTEM (PROBLEM SYMPTOMS TABLE) Click here

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  11. INSPECT TRANSMITTER BATTERY


    1. Inspect the transmitter battery Click here.

      Tech Tips

      Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. The terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.


    NG

    REPLACE TRANSMITTER BATTERY Click here

    OK

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

  12. CHECK PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Disconnect the D37 park/neutral position switch assembly connector.

    2. Inspect the park/neutral position switch assembly Click here.


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH)


    1. Disconnect the B76 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the D37 park/neutral position switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B76-16 (STAR) - D37-4 (B) Always Below 1 Ω
      B76-16 (STAR) or D37-4 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  14. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Disconnect the B2 stop light switch assembly connector.

    2. Inspect the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    OK

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


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the B2 stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B2-2 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-11 (STP1) - B2-1 Always Below 1 Ω
      B75-11 (STP1) or B2-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  16. READ VALUE USING GTS (STARTER SW)


    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 / Starting Control / Data List.

    5. Get into the vehicle while carrying an electrical key transmitter sub-assembly and press the engine switch with the shift lever in P and brake pedal depressed to check if the Data List display changes.

      Starting Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Starter SW Starter operation request/ON or OFF

      ON: Starter operation requested

      OFF: Starter operation not requested

      		 When malfunctioning, the engine will not crank.
      OK
      The Data List item changes.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  17. INSPECT ST RELAY (STARTER RELAY ASSEMBLY)


    1. Inspect the ST relay (starter relay assembly) Click here.


    NG

    REPLACE ST RELAY (STARTER RELAY ASSEMBLY)

    OK

  18. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - BODY GROUND)


    1. Disconnect the B76 certification ECU (smart key ECU assembly) connector.

    2. Move the shift lever to P or N.

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

      A003H1YE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      B76-16 (STAR) - Body ground 20°C (68°F) 93.75 to 136.36 Ω
      B76-37 (STA) - Body ground

    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH) Click here

    OK

  19. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.


    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

  20. CHECK HARNESS AND CONNECTOR (BATTERY - STARTER AND RELAY BLOCK ASSEMBLY)


    1. Remove the starter assembly from the vehicle to perform an inspection.

    2. Remove the ST relay (starter relay assembly) from the relay block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E7-1 - Body ground Always 11 to 14 V
      5 (ST relay (starter relay assembly)) - Body ground

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (ST relay (starter relay assembly)) - E9-1 Always Below 1 Ω
      3 (ST relay (starter relay assembly)) or E9-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    USE SIMULATION METHOD TO CHECK Click here

  21. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH)


    1. Disconnect the B76 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the D37 park/neutral position switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B76-16 (STAR) - D37-4 (B) Always Below 1 Ω
      B76-16 (STAR) or D37-4 (B) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the D37 park/neutral position switch assembly connector.

    2. Remove the ST relay (starter relay assembly) from the relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D37-5 (L) - 2 (ST relay (starter relay assembly)) Always Below 1 Ω
      D37-5 (L) or 2 (ST relay (starter relay assembly)) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  23. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY (STARTER RELAY ASSEMBLY))


    1. Disconnect the B76 certification ECU (smart key ECU assembly) connector.

    2. Remove the ST relay (starter relay assembly) from the relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B76-37 (STA) - 2 (ST relay (starter relay assembly)) Always Below 1 Ω
      B76-37 (STA) or 2 (ST relay (starter relay assembly)) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  24. CHECK HARNESS AND CONNECTOR (ST RELAY (STARTER RELAY ASSEMBLY - BODY GROUND)


    1. Remove the ST relay (starter relay assembly) from the relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (ST relay (starter relay assembly) - Body ground) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    USE SIMULATION METHOD TO CHECK Click here