СИСТЕМА ПОСАДКИ И ЗАПУСКА > Двигатель не запускается

для подготовки Нажмите здесь


DESCRIPTION


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 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 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 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


A157906E02


WIRING DIAGRAM

Refer to the CRANKING HOLDING FUNCTION CIRCUIT (see page Нажмите здесь).

INSPECTION PROCEDURE

1.CHECK WHETHER ENGINE STARTS AFTER STEERING LOCK INITIALIZATION

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

  1. Check that the engine starts.

    OK:
    Engine starts.

УКАЗАНИЕ:
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.

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

  1. Check for DTCs again.

    OK:
    No DTC is output.



NG
GO TO DTC CHART (Нажмите здесь)
OK


3.CHECK ENGINE SWITCH (SWITCH CONDITION)

  1. Ensure the key is inside the cabin.

  1. 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 (Нажмите здесь)
OK


4.CHECK BASIC FUNCTION

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

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

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

    OK:
    Engine cranks.



OK
Перейдите к шагу 9
NG


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

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

    Main body ECU 
    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
OK


6.READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

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

    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
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 (Нажмите здесь)
OK


8.INSPECT MAIN BODY ECU


    A135935E04

  1. Disconnect the A68 main body ECU connector.

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

  1. 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) (Нажмите здесь)
OK

REPLACE MAIN BODY ECU 

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

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

    Certification ECU 
    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