SMART ENTRY AND START SYSTEM Engine does not Start

DESCRIPTION


  1. ENGINE START SYSTEM FUNCTION


    1. If the engine switch is pressed with the shift lever is in the P or N position 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 the LIN communication line.

    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) outputs a steering UNLOCK signal. The signal is sent to the main body ECU via the 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 starter relay.

    9. The main body ECU deactivates the ACC relay until the main body ECU detects an engine start.

    10. When engine revolution speed reaches 1200 rpm, the ECM determines that the engine has been started.

      Symbol of main body ECU Signal
      STP Stop light switch ON signal Input
      SSW1/SSW2 Engine switch ON signal Input
      ACCD ACC relay operation signal Output
      SLP Steering lock actuator position signal Input
      IG1D IG1 relay operation signal Output
      IG2D IG2 relay operation signal Output
      STR2 Starter relay operation signal (Sub) Output
      STR Park/Neutral position switch signal Input
      TACH Engine start detection signal Input
      STSW Starter activation request signal Output
      ACCR ACC cut request signal Input
      Symbol of ECM Signal
      ACCR ACC cut request signal Output
      TACH Engine revolution speed signal Output
      STSW Starter activation request signal Input
      STAR Starter relay operation signal (Main) Output
      STA Starter activation signal Input
    A017DW7E03
    A017B5YE01

WIRING DIAGRAM

See "CRANKING HOLDING FUNCTION CIRCUIT" Click here.

INSPECTION PROCEDURE


  1. EMERGENCY ENGINE START CONTROL


    1. If there is a malfunction in the stop light switch circuit or STOP fuse, their 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 the P position.

      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

    If the main body ECU is replaced with a new one while the negative (-) battery terminal is connected, the power source mode will be in IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

    After the main body ECU, certification ECU (smart key ECU 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 THE ENGINE SWITCH CONDITION


    1. Check that the power source mode changes.


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

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

    NG

    GO TO OTHER FLOW CHART Click here

    OK

  2. CHECK DTC


    1. Delete the DTCs Click here.

    2. Check for DTCs again.

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

      Result
      Result Proceed to
      No DTC is output A
      Smart entry and start system (starting function) DTCs are output B
      Steering lock 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 (SMART ENTRY AND START SYSTEM (STARTING)) Click here

    C

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

    D

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

    E

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

    A

  3. 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 the P position, check that depressing the brake pedal and pressing the engine switch crank the engine.

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

    A

    GO TO SFI SYSTEM Click here

    B

  4. READ VALUE USING INTELLIGENT TESTER (STARTER CONTROL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Read the DATA LIST according to the displays on the tester screen.

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

      ON: Engine switch on (ST)

      OFF: Engine switch except on (ST)

      		 -
      Standard
      Engine switch condition Tester display
      When engine switch is on (ST) ON
      When engine switch is except on (ST) OFF

    NG

    READ VALUE USING INTELLIGENT TESTER (PARK/NEUTRAL POSITION SWITCH) Click here

    OK

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (STARTER RELAY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Perform Active Test according to the prompts displayed on the tester.

      ECM:
      Tester Display Test Part Control Range Diagnostic Note
      Activate the Starter Relay Starter ON or OFF -
    4. A017CHHE01

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

      Standard voltage
      Tester Connection Condition Specified Condition
      Starter relay terminal 2 - Starter relay terminal 1 When starter relay is ON by Active test using intelligent tester 8 to 14 V
      Starter relay terminal 2 - Starter relay terminal 1 When starter relay is OFF by Active test using intelligent tester Below 1 V

    NG

    INSPECT STARTER CUT RELAY Click here

    OK

  6. INSPECT STARTER RELAY


    1. A017B6E

      Remove the starter 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 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 STARTER RELAY

    OK

  7. CHECK HARNESS AND CONNECTOR (STARTER RELAY TERMINAL VOLTAGE AND RESISTANCE)


    1. A017CHHE01

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

      Standard voltage
      Tester Connection Condition Specified Condition
      Starter relay terminal 5 - Body ground Always 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Starter relay terminal 1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

    OK

  8. CHECK HARNESS AND CONNECTOR (STARTER RELAY - STARTER)


    1. Disconnect the B12 connector.

      A017F38E01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Engine room relay block starter relay terminal 3 - B12-1 Always Below 1 Ω
      Engine room relay block starter relay terminal 3 or B12-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - STARTER)

    OK

  9. CHECK HARNESS AND CONNECTOR (BATTERY - STARTER)


    1. A017EH3E01

      Disconnect the C1 connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      C1-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER)

    OK

    REPLACE STARTER ASSEMBLY Click here

  10. READ VALUE USING INTELLIGENT TESTER (PARK/NEUTRAL POSITION SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Read the DATA LIST according to the displays on the tester screen.

      Body:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      N SW / C SW Park/Neutral position switch / ON or OFF

      ON: Shift position is P or N

      OFF: Shift position is not P or N

      		 -
      OK
      "ON" (Shift position is P or N) and "OFF" (Shift position is not P or N) appear on the screen.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND) Click here

    OK

  11. READ VALUE USING INTELLIGENT TESTER (S CODE)


    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 tester and vehicle starts.

    2. Turn the engine switch on (IG).

      Entry & Start:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      S Code Chk S code check / OK or NG

      OK: Normal

      NG: Malfunction

      		 -
      OK
      "OK" is displayed on the screen.

    NG

    ECU CODE REGISTRATION Click here

    OK

  12. READ VALUE USING INTELLIGENT TESTER (L CODE)


    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 tester and vehicle starts.

    2. Turn the engine switch on (IG).

      Entry & Start:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      L Code Chk L code check / OK or NG

      OK: Normal

      NG: Malfunction

      		 -
      OK
      "OK" is displayed on the screen.

    NG

    ECU CODE REGISTRATION Click here

    OK

  13. READ VALUE USING INTELLIGENT TESTER (IMMOBILISER SYSTEM STATUS)


    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 tester and vehicle starts.

    2. Turn the engine switch on (IG).

      Immobiliser:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      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 (ENGINE START REQUEST) Click here

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

  14. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND)


    1. A017CATE02

      Disconnect the D7 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
      D7-8 (STA) - Body ground Shift position is P or N 105 to 115 Ω
      D7-8 (STA) - Body ground Shift position is not P nor N 10 kΩ or higher

    NG

    INSPECT PARK/NEUTRAL POSITION SWITCH Click here

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

  15. INSPECT PARK/NEUTRAL POSITION SWITCH


    1. A017BGEE11

      Disconnect the B5 connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      4 - 5 P Below 1 Ω
      4 - 5 N Below 1 Ω
      4 - 5 Except P and N 10 kΩ or higher

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH Click here

    OK

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


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

      A017FIXE02
      Standard resistance
      Tester Connection Condition Specified Condition
      D7-8 (STR) - B5-4 Always Below 1 Ω
      D7-8 (STA) or B5-4 - Body ground Always 10 kΩ or higher

    NG

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

    OK

  17. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)


    1. Disconnect the B3 connector from the ECM.

      A017F6JE01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      B5-5 - B3-11 (STA) Always Below 1 Ω
      B5-5 or B3-11 (STA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)

    OK

  18. INSPECT STARTER RELAY


    1. A017B6E

      Remove the starter relay from 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 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 STARTER RELAY

    OK

  19. CHECK HARNESS AND CONNECTOR (ECM - STARTER RELAY)


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

      A017B8XE01
      Standard resistance
      Tester Connection Condition Specified Condition
      Engine room relay block starter relay terminal 2 - B3-11 (STA) Always Below 1 Ω
      Engine room relay block starter relay terminal 2 or B3-11 (STA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STARTER RELAY)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - BODY GROUND)

  20. INSPECT STARTER CUT RELAY


    1. A017B6EE23

      Remove the starter cut 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
      Engine room relay block starter relay terminal 2 - B3-11 (STA) Always Below 1 Ω
      Engine room relay block starter relay terminal 2 or B3-11 (STA) - Body ground Always 10 kΩ or higher

    NG

    REPLACE STARTER CUT RELAY

    OK

  21. CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY - ECM)


    1. Disconnect the B2 connector from the ECM.

      A017ELUE01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Engine room relay block starter cut relay terminal 5 - B2-8 (STAR) Always Below 1 Ω
      Engine room relay block starter cut relay terminal 5 or B2-8 (STAR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER CUT RELAY - ECM)

    OK

  22. CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY - MAIN BODY ECU)


    1. Disconnect the D9 connector from the main body ECU.

      A017DSDE02

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Engine room relay block starter cut relay terminal 5 - D9-6 (STR2) Always Below 1 Ω
      Engine room relay block starter cut relay terminal 5 or D9-6 (STR2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER CUT RELAY - MAIN BODY ECU)

    OK

  23. CHECK HARNESS AND CONNECTOR (ECM - STARTER RELAY)


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

      A017B8XE01
      Standard resistance
      Tester Connection Condition Specified Condition
      Engine room relay block starter relay terminal 2 - B3-11 (STA) Always Below 1 Ω
      Engine room relay block starter relay terminal 2 or B3-11 (STA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STARTER RELAY)

    OK

    REPLACE ECM Click here

  24. ECU CODE REGISTRATION


    1. Register the ECU code.


    NEXT

  25. 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 the P position, 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 B

    B

    END (ECU CODE DEFECTIVE)

    A

  26. REPLACE CERTIFICATION ECU (SMART KEY ECU)


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


    NEXT

  27. KEY REGISTRATION


    1. Register the key.


    NEXT

  28. 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 the P position, 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 B

    B

    END

    A

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  29. ECU CODE REGISTRATION


    1. Register the ECU code.


    NEXT

  30. 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 the P position, 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 B

    B

    END

    A

  31. REPLACE STEERING LOCK ECU


    1. Replace the steering lock ECU Click here.


    NEXT

  32. ECU CODE REGISTRATION


    1. Register the ECU code.


    NEXT

  33. 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 the P position, 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 B

    B

    END

    A

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

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


    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 tester and vehicle starts.

    2. Turn the engine switch on (IG).

      Smart key:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Start Rqst Start request signal response / OK or NG

      OK: Received

      NG: Not received

      		 -
      OK
      "OK" (received) and "NG" (not received) appear on the screen.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)