Smart Key System (For Start Function) Engine Does Not Start

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK THE ENGINE SWITCH CONDITION

CHECK FOR DTC

CHECK CRANKING FUNCTION

READ VALUE USING TECHSTREAM (STARTER CONTROL)

PERFORM ACTIVE TEST USING TECHSTREAM (ST RELAY)

INSPECT ST RELAY

CHECK HARNESS AND CONNECTOR (ST RELAY TERMINAL VOLTAGE AND RESISTANCE)

CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER)

CHECK HARNESS AND CONNECTOR (BATTERY - STARTER)

READ VALUE USING TECHSTREAM (PARK/NEUTRAL POSITION SWITCH)

READ VALUE USING TECHSTREAM (S CODE)

READ VALUE USING TECHSTREAM (L CODE)

READ VALUE USING TECHSTREAM (IMMOBILISER SYSTEM STATUS)

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

INSPECT PARK/NEUTRAL POSITION SWITCH

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

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

INSPECT ST RELAY

CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)

INSPECT ST CUT RELAY

CHECK HARNESS AND CONNECTOR (ST CUT RELAY - ECM)

CHECK HARNESS AND CONNECTOR (ST CUT RELAY - MAIN BODY ECU)

CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)

REGISTER RECOGNITION CODE (ECU CODE)

CHECK CRANKING FUNCTION

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

KEY REGISTRATION

CHECK CRANKING FUNCTION

REGISTER RECOGNITION CODE (ECU CODE)

CHECK CRANKING FUNCTION

REPLACE STEERING LOCK ECU

REGISTER RECOGNITION CODE (ECU CODE)

CHECK CRANKING FUNCTION

READ VALUE USING TECHSTREAM (ENGINE START REQUEST)

SMART KEY SYSTEM (for Start Function) - Engine does not Start

DESCRIPTION

ENGINE START SYSTEM FUNCTION

1. If the engine switch is pressed with the shift lever is in P or N and the brake pedal depressed, the main body ECU (instrument panel junction block) 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 (instrument panel junction block) activates the ACC relay.
   

4. The main body ECU (instrument panel junction block) 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 (instrument panel junction block) via the steering lock ECU.
   

6. The main body ECU (instrument panel junction block) sends an engine start request signal to the ECM.
   

7. The ECM sends an ACC cut request signal to the main body ECU (instrument panel junction block).
   

8. The ECM and main body ECU (instrument panel junction block) activate the ST relay.
   

9. The main body ECU (instrument panel junction block) deactivates the ACC relay until the main body ECU (instrument panel junction block) detects an engine start.
   

10. When engine revolution speed reaches 1200 rpm, the ECM determines that the engine has been started.
    The ECM stops sending an ACC cut request signal to the main body ECU.
    The main body ECU (instrument panel junction block) reactivates the ACC relay and turns off the engine switch indicator light, when engine revolution speed reaches 800 rpm.
    
    

    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	ST 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	ST relay operation signal (Main)	Output
    STA	Starter activation signal	Input

WIRING DIAGRAM

See CRANKING HOLDING FUNCTION CIRCUIT (COROLLA_ZRE142 RM000001FLC087X_02.html).

INSPECTION PROCEDURE

EMERGENCY ENGINE START CONTROL

1. If there is a malfunction in the stop light switch or STOP fuse, their signals may not be correctly transmitted to the main body ECU (instrument panel junction block). 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 P.
   To activate the starter:

   1. Turn the engine switch from off to on (ACC).
      

   2. Hold pressing and hold the engine switch for 15 seconds.
      

HINT:

After the main body ECU (instrument panel junction block), certification ECU (smart key ECU assembly), steering lock ECU, ID code box (immobiliser code ECU) and/or ECM are/is replaced, perform the registration procedures for the engine immobiliser system (COROLLA_ZRE142 RM000000QYF05AX.html).

1.CHECK THE ENGINE SWITCH CONDITION

1. Check the power source mode changes.
   

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

      OK:

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

NG	GO TO OTHER FLOW CHART (COROLLA_ZRE142 RM0000020S909YX.html)

OK

2.CHECK FOR DTC

1. Clear the DTCs (COROLLA_ZRE142 RM000000YEH0CGX.html).
   

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 key system (for start 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 KEY SYSTEM (STARTING)) (COROLLA_ZRE142 RM000000XIZ0EQX.html)
C	GO TO DIAGNOSTIC TROUBLE CODE CHART (STEERING LOCK SYSTEM) (COROLLA_ZRE142 RM000000XWM05GX.html)
D	GO TO DIAGNOSTIC TROUBLE CODE CHART (ENGINE IMMOBILISER SYSTEM) (COROLLA_ZRE142 RM000000QY6060X.html)
E	GO TO DIAGNOSTIC TROUBLE CODE CHART (VEHICLE STABILITY CONTROL SYSTEM) (COROLLA_ZRE142 RM000000XHU0A5X.html)

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 P, 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 (COROLLA_ZRE142 RM000000PDF0G8X.html)

B

4.READ VALUE USING TECHSTREAM (STARTER CONTROL)

1. Connect the Techstream to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Read the Data List according to the displays on the Techstream screen.
   
   

   Engine and ECT

   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	Go to step 10

OK

5.PERFORM ACTIVE TEST USING TECHSTREAM (ST RELAY)

1. Connect the Techstream to the DLC3.
   

2. Turn the engine switch on (IG).
   

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

   Engine and ECT

   Tester Display	Test Part	Control Range	Diagnostic Note
   Activate the ST Relay	Starter	ON or OFF	-

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST relay terminal 2 - Relay block No. 8 ST relay terminal 1	When ST relay is ON by Active test using Techstream	8 to 14 V
   Relay block No. 8 ST relay terminal 2 - Relay block No. 8 ST relay terminal 1	When ST relay is OFF by Active test using Techstream	Below 1 V

NG	Go to step 20

OK

6.INSPECT ST RELAY

1. Remove the ST relay from the relay block No. 8.
   

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 ST RELAY

OK

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

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST 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
   Relay block No. 8 ST relay terminals 1 - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

OK

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

1. Disconnect the B8 connector.
   

   
   
   
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST relay terminal 3 - B8-1	Always	Below 1 Ω
   Relay block No. 8 ST relay terminal 3 or B8-1 - Body ground	Always	10 kΩ or higher

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

OK

9.CHECK HARNESS AND CONNECTOR (BATTERY - STARTER)

1. Disconnect the B4 connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   B4-1 - Body ground	Always	11 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER)

OK
REPLACE STARTER ASSEMBLY

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

1. Connect the Techstream to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Read the Data List according to the displays on the Techstream screen.
   
   

   Main 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 nor N	-

   OK:

   "ON" (Shift position is P or N) and "OFF" (Shift position is not P nor N) appear on the screen.
   

NG	Go to step 14

OK

11.READ VALUE USING TECHSTREAM (S CODE)

1. Connect the Techstream to the DLC3.
   

   HINT:

   When using the Techstream 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 Techstream and vehicle starts.

2. Turn the engine switch on (IG).
   

3. Read the Data List according to the displays on the Techstream.
   
   

   Smart Key

   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	Go to step 24

OK

12.READ VALUE USING TECHSTREAM (L CODE)

1. Connect the Techstream to the DLC3.
   

   HINT:

   When using the Techstream 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 Techstream and vehicle starts.

2. Turn the engine switch on (IG).
   

3. Read the Data List according to the displays on the Techstream.
   
   

   Smart Key

   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	Go to step 29

OK

13.READ VALUE USING TECHSTREAM (IMMOBILISER SYSTEM STATUS)

1. Connect the Techstream to the DLC3.
   

   HINT:

   When using the Techstream 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 Techstream and vehicle starts.

2. Turn the engine switch on (IG).
   

3. Read the Data List according to the displays on the Techstream.
   
   

   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	Go to step 34

OK
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

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

1. Disconnect the E52 connector from the main body ECU (instrument panel junction block).
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E52-3 (STR) - Body ground	Shift position is P or N	105 to 115 Ω
   E52-3 (STR) - Body ground	Shift position is not P nor N	10 kΩ or higher

NG	Go to step 15

OK
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

15.INSPECT PARK/NEUTRAL POSITION SWITCH

1. Disconnect the B88 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 (COROLLA_ZRE142 RM00000191D03LX.html)

OK

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

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

   
   
   
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E52-3 (STR) - B88-4	Always	Below 1 Ω
   E52-3 (STR) or B88-4 - 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 E50 connector from the ECM.
   

   
   
   
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   B88-5 - A50-48 (STA)	Always	Below 1 Ω
   B88-5 or A50-48 (STA) - Body ground	Always	10 kΩ or higher

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

OK

18.INSPECT ST RELAY

1. Remove the ST 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 ST RELAY

OK

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

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

   
   
   
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST relay terminal 2 - A50-48 (STA)	Always	Below 1 Ω
   Relay block No. 8 ST relay terminal 2 or A50-48 (STA) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ST RELAY)

OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND)

20.INSPECT ST CUT RELAY

1. Remove the ST CUT relay from the relay block No. 8.
   

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 applied to terminals 1 and 2	Below 1 Ω
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher

NG	REPLACE ST CUT RELAY

OK

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

1. Disconnect the A50 connector from the ECM.
   

   
   
   
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST CUT relay terminal 5 - A50-25 (STAR)	Always	Below 1 Ω
   Relay block No. 8 ST CUT relay terminal 5 or A50-25 (STAR) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - ECM)

OK

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

1. Disconnect the E52 connector from the main body ECU (instrument panel junction block).
   

   
   
   
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST CUT relay terminal 5 - E52-14 (STR2)	Always	Below 1 Ω
   Relay block No. 8 ST CUT relay terminal 5 or E52-14 (STR2) - Body ground	Always	10 kΩ or higher

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

OK

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

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

   
   
   
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ST relay terminal 2 - A50-48 (STA)	Always	Below 1 Ω
   Relay block No. 8 ST relay terminal 2 or A50-48 (STA) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ST RELAY)

OK
REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

24.REGISTER RECOGNITION CODE (ECU CODE)

1. Register the recognition code (ECU code) (COROLLA_ZRE142 RM000000QYF05AX.html).
   

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

      Result:

      Result	Proceed to
      Engine does not crank	A
      Engine cranks	B

B	END

A

26.REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

1. Replace the certification ECU (smart key ECU assembly) (COROLLA_ZRE142 RM000003G0O004X.html).
   

NEXT

27.KEY REGISTRATION

1. Register the key (COROLLA_ZRE142 RM000000QYF05AX_01_0001.html).
   

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

      Result:

      Result	Proceed to
      Engine does not crank	A
      Engine cranks	B

B	END

A
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) (COROLLA_ZRE142 RM000003G05004X.html)

29.REGISTER RECOGNITION CODE (ECU CODE)

1. Register the recognition code (ECU code) (COROLLA_ZRE142 RM000000QYF05AX.html).
   

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 P, check that depressing the brake pedal and pressing the engine switch crank 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 (COROLLA_ZRE142 RM000000UD005GX_01_0019.html).
   

NEXT

32.REGISTER RECOGNITION CODE (ECU CODE)

1. Register the recognition code (ECU code) (COROLLA_ZRE142 RM000000QYF05AX.html).
   

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

      Result:

      Result	Proceed to
      Engine does not crank	A
      Engine cranks	B

B	END

A
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) (COROLLA_ZRE142 RM000003G05004X.html)

34.READ VALUE USING TECHSTREAM (ENGINE START REQUEST)

1. Connect Techstream to the DLC3.
   

   HINT:

   When using Techstream 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 Techstream and vehicle starts.

2. Turn the engine switch on (IG).
   

3. Read the Data List according to the displays on the Techstream.
   
   

   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) (COROLLA_ZRE142 RM000003G0O004X.html)

OK
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) (COROLLA_ZRE142 RM000003G05004X.html)