ENTRY AND START SYSTEM Engine does not Start

DESCRIPTION


  1. ENGINE START SYSTEM OPERATION


    1. When the engine switch is pressed with the brake pedal depressed and shift lever in P or N, the main body ECU determines that it is an engine start request.

    2. The certification ECU and other ECUs perform key verification via the LIN communication line. The engine switch indicator light illuminates in green.

    3. The main body ECU activates the D-ACC, D-IG1-1 and IG2 relays.

    4. The certification ECU outputs a steering UNLOCK signal. The signal is sent to the steering lock ECU via the LIN communication line.

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

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

    7. The ECM and main body ECU activate the ST CUT/IGCT2 relay.

    8. The main body ECU deactivates the D-ACC relay until the ECU detects an engine start.

    9. The ECU reactivates the D-ACC relay and turns off the engine switch indicator light.

      Symbols of main body ECU Signals
      SSW1/SSW2 Engine switch on (ACC, IG) signal
      ACCD D-ACC relay operation signal
      IG2D IG2 relay operation signal
      STR2 ST CUT/IGCT2 relay operation signal
      STR Park / neutral position switch signal
      STP Stop light switch signal
      TACH Engine start detection signal
      STSW Starter activation request signal
      ACCR ACC cut request signal
    A01GKIZE02

WIRING DIAGRAM

Refer to the CRANKING HOLDING FUNCTION CIRCUIT Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK WHETHER ENGINE STARTS AFTER STEERING LOCK INITIALIZATION


    1. Open and close the driver door when the engine switch is off.

    2. Check that the engine starts.

      OK
      Engine starts.

      Tech Tips

      After the battery runs out, the engine may not start if the steering lock ECU has not been initialized (lock / unlock may not be recorded) through the procedure described above.


    OK

    SYSTEM OK

    NG

  2. CHECK WHETHER DTC OUTPUT RECURS (MAIN BODY ECU AND CERTIFICATION ECU)


    1. Clear the DTCs Click here.

      Tech Tips

      After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

    2. Check for DTCs again.

      OK
      No DTC is output.

    NG

    GO TO DTC CHART Click here

    OK

  3. CHECK ENGINE SWITCH (SWITCH CONDITION)


    1. Ensure the key is inside the cabin.

    2. With the brake pedal released, check that the power source mode changes as shown below each time the engine switch is pushed.

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

    NG

    GO TO POWER SOURCE MODE DOES NOT CHANGE Click here

    OK

  4. CHECK BASIC FUNCTION


    1. Ensure that there is fuel in the fuel tank and the key is inside the cabin.

    2. Depress the brake pedal with the shift lever in P or N, and keep depressing the pedal.

    3. Check that the engine cranks when the engine switch is pressed.

      OK
      Engine cranks.

    OK

    READ VALUE USING INTELLIGENT TESTER (ENGINE START REQUEST) Click here

    NG

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


    1. Use the Data List to check if the park / neutral position switch is functioning properly.

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

      ON: Shift lever in P or N

      OFF: Shift lever in R or D

      		 -
      OK
      When the shift lever is in P or N, ON is displayed on the tester.

    NG

    REPAIR OR REPLACE PARK / NEUTRAL POSITION SWITCH Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)


    1. Use the Data List to check if the stop light switch is functioning properly.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop Light switch/ON or OFF

      ON: Brake pedal is depressed

      OFF: Brake pedal is released

      		 -
      OK
      When the brake pedal is depressed, ON is displayed on the tester.

    NG

    REPAIR OR REPLACE STOP LIGHT SWITCH ASSEMBLY

    OK

  7. CHECK STEERING LOCK SYSTEM


    1. When the engine switch is on (ACC), check that the steering lock can be released.

      OK
      Steering lock can be released.

    NG

    GO TO STEERING LOCK SYSTEM Click here

    OK

  8. INSPECT MAIN BODY ECU


    1. A01GJ1LE04

      Disconnect the A68 main body ECU connector.

    2. Depress the brake pedal with the shift lever in P or N, and keep depressing the pedal.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      A68-4 (STSW) - Body ground When the engine cranks by pressing the engine switch. 11 to 14 V

    NG

    GO TO SFI SYSTEM (CRANKING HOLDING FUNCTION CIRCUIT) Click here

    OK

    REPLACE MAIN BODY ECU

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


    1. Use the Data List to check if the engine start request is functioning properly.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Start Request Starter request signal/Yes or No

      YES: ID code box receives immobiliser unset signal

      NO: ID code box does not receive immobiliser unset signal

      		 -
      OK
      When ID code box receives immobiliser unset signal, YES is displayed on tester.

    NG

    REPLACE CERTIFICATION ECU

    OK

    REPLACE ID CODE BOX