Entry And Start System Engine Does Not Start

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK IF ENGINE START (INITIALIZE STEERING LOCK)

CHECK FOR DTC

CHECK SWITCH CONDITION

CHECK CRANKING FUNCTION

READ VALUE OF INTELLIGENT TESTER (STA SIGNAL)

READ VALUE OF INTELLIGENT TESTER (STEERING LOCK)

CHECK STEERING LOCK

INSPECT ECM (STAR AND STSW VOLTAGE)

INSPECT RELAY (ST CUT)

INSPECT CLUTCH START SWITCH

INSPECT RELAY (STARTER)

CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ST RELAY)

INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)

INSPECT STARTER ASSEMBLY

CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM)

CHECK AND REPLACE POWER SOURCE CONTROL ECU

READ VALUE OF INTELLIGENT TESTER (L CODE)

READ VALUE OF INTELLIGENT TESTER (ENGINE START REQUEST)

READ VALUE OF INTELLIGENT TESTER (S CODE)

INSPECT ID CODE BOX

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)

INSPECT POWER SOURCE CONTROL ECU

INSPECT STEERING LOCK ECU

DESCRIPTION

1. If the engine switch is pressed with the clutch pedal depressed, the power source control ECU determines that it is an engine start request.
   

2. The certification ECU and other ECUs perform key verification via the LIN communication line.
   

3. The power source control ECU activates the ACC relay.
   

4. The power source control ECU activates the IG1 and IG2 relays.
   

5. The certification ECU outputs a steering UNLOCK signal. The signal is sent to the power source control ECU via the steering lock ECU.
   

6. The power source control ECU sends an engine start request signal to the ECM.
   

7. The ECM sends an ACC cut request signal to the power source control ECU.
   

8. The ECM and power source control ECU activate the ST relay.
   

9. The power source control ECU deactivates the ACC relay until the ECU detects an engine start.
   

10. When engine revolution speed reaches 200 rpm, the power source control ECU determines that the engine has been started.
    The ECU reactivates the ACC relay and turns off the engine switch indicator light.
    
    

    Symbols of power source control ECU	Signals
    SSW1/SSW2	Engine switch ON signal
    ACCD	ACC relay operation signal
    IG2D	IG2 relay operation signal
    STR2	ST relay operation signal
    STR1	Clutch start switch
    TACH	Engine start detection signal
    STSW	Starter activation request signal
    CTSW	ACC cut request signal

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Open and close the driver's door with the engine switch off. Check if the engine can be started.
   

   OK:

   Engine can be started.
   

   HINT:

   After the battery is discharged and then recharged, the engine may not start unless the steering lock is initialized using the above procedure.

1. Delete the DTCs (Click here).
   

2. Check for DTCs again.
   

   OK:

   No DTC is output.
   

1. Check the power source mode condition.
   

   1. When the key is inside the vehicle, check the clutch pedal not depressed and each time the engine switch is pushed causes the power source mode change.
      

      OK:

      Power source mode change
      off → on (ACC) → in (IG) → off
      

      HINT:

      1. If power mode does not change to ON (IG and ACC) (Click here).
         
      2. If power mode does not change to ON (IG) (Click here).
         
      3. If power mode does not change to ON (ACC) (Click here).
         

1. Check the engine cranking function.
   

   1. When there is fuel in the tank, the key is inside the vehicle, check that depressing the clutch pedal and pressing the engine switch cranks the engine.
      

      OK:

      Engine cranks.
      

1. Connect the intelligent tester to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Check the result when the engine switch is turned on (IG) and the engine is started.
   
   

   Standard:

   Engine Switch Position	ON (IG)	ENGINE START
   St Relay Mon	OFF	ON

   OK:

   ON (ENGINE START) and OFF (ENGINE SWITCH ON (IG)) appear on the screen.
   

1. Connect the intelligent tester to the DLC3.
   

2. Turn the engine switch on (IG).
   
   

   Power Source Control:

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   Str Unlock SW	Steering lock condition/ ON or OFF	ON: Steering is unlocked OFF: Steering is locked	-

   OK:

   ON (steering is unlocked) and OFF (steering is locked) appear on the screen.
   

1. Check if the steering lock is released when turning the engine switch on (ACC).
   

   OK:

   The steering lock is released.
   

1. Measure the voltage of the J55 power source control ECU connector while cranking the engine.
   

   Standard voltage:

   Tester Connection (symbols)	Specified Condition
   J55-39 (STSW) - J55-6 (GND2)	Output voltage at terminal AM2 is -2 V or more.

2. Disconnect the J55 ECU connector.
   

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

   Standard voltage:

   Tester Connection (symbols)	Specified Condition
   J55-15 (STR2) - J55-6 (GND2)	9 to 14 V

   Result:

   Terminal STR2	Terminal STSW	Proceed to
   9 to 14 V	9 to 14 V	A
   0 V	9 to 14 V	B
   0 V	0 V	C

1. Remove the ST CUT relay from the engine room J/B and R/B No. 2.
   

2. Measure the resistance of the ST CUT relay.
   

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage applied to terminals 1 and 2)

1. Disconnect the clutch switch connector.
   

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

   Standard resistance:

   Clutch Pedal Operation	Tester Connection	Specified Condition
   Depressed	1 - 2	Below 1 Ω
   Released	1 - 2	10 kΩ or higher

1. Remove the starter relay from the engine room J/B and R/B No. 1.
   

2. Measure the resistance of the starter relay.
   

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage applied to terminals 1 and 2)

1. Check the harness and the connector between the starter relay.
   

   1. Disconnect the A24 switch connector.
      

   2. Remove the starter relay from the engine room J/B and R/B No. 1.
      

   3. Measure the resistance of the wire harness side connectors.
      

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      Clutch start switch (A24-2) - Starter relay (1)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connection	Specified Condition
      Clutch start switch (A24-2) or Starter relay (1) - Body ground	10 kΩ or higher

2. Check the harness and the connector between the starter relay and the body ground.
   

   1. Remove the starter relay from the engine room J/B and R/B No. 1.
      

   2. Measure the resistance of the starter relay and the body ground.
      

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      Starter relay (2) - Body ground	Below 1 Ω

1. Remove the starter relay from the engine room J/B and R/B No. 1.
   

2. Measure the voltage of the engine room J/B and R/B No. 1 and the body ground.
   

   Standard voltage:

   Tester Connection	Specified Condition
   Starter relay (5) - Body ground	9 to 14 V

HINT:

Click here

1. Check the harness and the connectors between the power source control ECU and ECM.
   

   1. Disconnect the power source control ECU connector.
      

   2. Disconnect the A49 ECM connector.
      

   3. Measure the resistance of the wire harness side connectors.
      

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      J55-39 (STSW) - A49-9 (STSW)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connection	Specified Condition
      J55-39 (STSW) or A49-9 (STSW) - Body ground	10 kΩ or higher

1. Replace the power source control ECU.
   

2. Check the engine cranking function.
   

   1. When there is fuel in the tank and the key is inside the vehicle, check that depressing the clutch pedal and the brake pedal and pressing the engine switch crank the engine.
      

      OK:

      Engine cranks.
      

      HINT:

      After the power source control ECU is replaced the engine may not start unless the each system are initialized using the above procedure.

1. Reconnect the connectors.
   

2. Connect the intelligent tester to the DLC3.
   

3. Turn the engine switch on (IG).
   
   

   Entry & Start:

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   L Code Chk	L code check/ ON or NG	OK: Normal NG: Malfunction	Electrical key in the cabin

   OK:

   OK is displayed on the screen.
   

   HINT:

   If the result of the inspection for a tester display is not as specified, there may be malfunction of the steering lock ECU or the ID code box.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the engine switch on (IG).
   
   

   Entry & Start:

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   Start Rqst	Start request signal response/ OK or NG	OK: Received NG: Non-received	-

   OK:

   OK (received) and NG (non-received) appear on the screen.
   

1. Connect the intelligent tester to the DLC3.
   

2. Turn the engine switch on (IG).
   
   

   Entry & Start:

   Item	Measurement Item/Display (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.
   

   HINT:

   If the result of the inspection for a tester display is not as specified, there may be malfunction of the certification ECU or the ID code box.

1. Check the input signal waveform.
   

   1. Connect the oscilloscope to the terminals J69-6 (EFIO) and J69-5 (EFII).
      

   2. Turn the engine switch on (IG).
      

   3. Check the signal waveform according to the condition(s) in the table below.
      

      Item	Condition
      Tool setting	10 V/DIV., 100 ms./DIV.
      Vehicle condition	Engine switch on (IG)

1. Disconnect the ECU connector.
   

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

   Standard resistance:

   Tester Connection (Symbols)	Specified Condition
   J55-26 (SLP) - J29-4 (SLP1)	Below 1 Ω
   J55-26 (SLP) or J29-4 (SLP1) - Body ground	10 kΩ or higher

1. Reconnect the J55 ECU connector.
   

2. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
   

   Item	Contents
   Terminal (Symbols)	J55-26 (SLP) - Body ground
   Equipment Setting	2 V/DIV., 100 ms./DIV.
   Condition	Engine switch on (IG)

   OK:

   The waveform appears as shown in the illustration.
   

1. Reconnect the J29 ECU connector.
   

2. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
   

   Item	Contents
   Terminal (Symbols)	J55-26 (SLP) - Body ground
   Equipment Setting	2 V/DIV., 100 ms./DIV.
   Condition	Steering is LOCK / UNLOCK

   OK:

   The waveform appears as shown in the illustration.