Entry And Start System Engine Does Not Start

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK BASIC FUNCTION

CHECK SWITCH CONDITION

CHECK BASIC FUNCTION

CHECK STEERING LOCK SYSTEM

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - PNP SWITCH)

CHECK WIRE HARNESS (ENGINE ROOM NO. 2 RELAY BLOCK - POWER SOURCE CONTROL ECU)

CHECK POWER SOURCE CONTROL ECU

DESCRIPTION

1. If the engine switch is pressed with the shift lever in P or N and the brake 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, IG2, and ST CUT relays. The engine switch indicator light illuminates green.
   

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

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

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

8. The ECM sends an ACC relay cut signal to the power source control ECU.
   

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

10. When engine revolution speed reaches 800 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
    STP	Stop light switch ON signal
    SSW1/SSW2	Engine switch ON signal
    ACCD	ACC relay operation signal
    IG2D	IG2 relay operation signal
    STR2	ST relay operation signal
    STR1	Park/neutral position switch signal
    TACH	Engine start detection signal
    STSW	Starter activation request signal
    CTSW	Start assist signal

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Delete the DTCs.
   

   HINT:

   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.
   

1. When there is fuel in the fuel tank, the key is inside the vehicle and the shift lever is on P, check that depressing the brake pedal causes the engine to start.
   

   OK:

   Engine starts.
   

1. When the key is inside the vehicle and the shift lever is on P, check that depressing the brake pedal while pressing the engine switch causes the power source mode to change as follows.
   

   OK:

   off → on (ACC) → on (IG) → off
   

1. When there is fuel in the fuel tank, the key is inside the vehicle and the shift lever is on P, check that depressing the brake pedal and pressing the engine switch cranks the engine.
   

   OK:

   Engine cranks.
   

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

   OK:

   Steering lock can be released.
   

1. Disconnect the L73 ECU connector.
   

2. Disconnect the E25 switch connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   L73-17 (STR1) - E25-9	Below 1 Ω
   L73-17 (STR1) or E25-9 - Body ground	10 kΩ or higher

1. Remove the ST CUT relay from the engine room No. 2 relay block.
   

2. Disconnect the L73 ECU connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   Engine room No. 2 relay block ST CUT relay terminal 3 - L73-15 (STR2)	Below 1 Ω
   Engine room No. 2 relay block ST CUT relay terminal 3 or L73-15 (STR2) - Body ground	10 kΩ or higher

   Standard resistance:

   Tester Connection	Specified Condition
   Engine room No. 2 relay block ST CUT relay terminal 2- L73-35 (IG2D)	Below 1 Ω
   Engine room No. 2 relay block ST CUT relay terminal 2 or L73-35 (IG2D) - Body ground	10 kΩ or higher

1. Reconnect the L73 ECU connector.
   

2. Measure the voltage of the ECU.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   L73-39 (STSW) - Body ground	Engine switch on (IG)	10 to 14 V