Engine does not Start: Procedure

1. Check the power source mode change.
   1. When the key is inside the vehicle and the shift lever is in P, check that pressing the engine switch causes the power source mode to change as follows:

      OK

      off → on (ACC) → on (IG) → off

NG → See step   27 

OK: Go to next step 

1. Clear the DTCs, refer to DTC CHECK / CLEAR .
2. Check whether the trouble recurs 5 seconds after the engine switch is turned on (IG).
3. Check whether DTCs for the main body ECU or certification ECU (smart key ECU assembly) are output.
   RESULT
   
   

   Result	Proceed to
   No DTC output	A
   Main body ECU Smart key system (for start function)	B
   Certification ECU (Smart key ECU assembly) Steering lock system	C
   Certification ECU (Smart key ECU assembly) Engine immobiliser system	D

B → See step   24 

C → See step   25 

D → See step   26 

A: Go to next step 

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 cranks the engine.

      OK

      Engine cranks.

NG → See step   8 

OK: Go to next step 

1. Use the Data List to check if L code certification is functioning properly.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	L code certification result/NG or OK	OK: L code certification result normal NG: L code certification result abnormal	-

   OK

   OK is displayed on the Techstream.

NG → See step   22 

OK: Go to next step 

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

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Engine Start Condition	Engine start condition by certification ECU (smart key ECU assembly)/OK or NG	OK: Engine start permitted NG: Engine start prohibited	-

   OK

   OK is displayed on the Techstream.

NG → See step   23 

OK: Go to next step 

1. Use the Data List to check if S code certification is functioning properly.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	S code certification result/NG or OK	OK: S code certification result normal NG: S code certification result abnormal	-

   OK

   OK is displayed on the Techstream.

NG → See step   23 

OK: Go to next step 

1. Replace the ID code box (immobiliser code ECU), refer to REMOVAL .
2. Register the recognition code (ECU code), refer to REGISTRATION .
3. Check that the engine starts.

   OK

   Engine starts.

NG → See step   29 

OK → END 

1. Use the Data List to check if the shift position signal is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Shift P Signal	Shift P position signal/ON or OFF	ON: Shift lever in P OFF: Shift lever not in P	-

   OK

   ON (shift lever in P) and OFF (shift lever not in P) are displayed on the Techstream.

NG → See step   13 

OK: Go to next step 

1. Use the Data List to check if the park/neutral 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 not in P or N	-

   OK

   ON (shift lever in P or N) and OFF (shift lever not in P or N) are displayed on the Techstream.

NG → See step   15 

OK: Go to next step 

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 depressed OFF: Brake pedal released	-

   OK

   ON (brake pedal is depressed) and OFF (brake pedal is released) are displayed on the Techstream.

NG → See step   19 

OK: Go to next step 

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

   OK

   The steering lock is released.

NG → See step   28 

OK: Go to next step 

Fig 1: Identifying Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   HINT: 

   The voltage is generated at terminal STSW for 0.3 seconds when the engine cranks.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E4-4 (STSW) - Body ground	Brake pedal depressed with shift lever in P, engine switch pushed once	11 to 14 V

NG → REPLACE MAIN BODY ECU 

OK → See step   34 

Fig 2: Identifying Shift Lock Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E51 shift lock control ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   11 (P2) - 3 (E)	Shift lever not in P	Below 1 Ω
   11 (P2) - 3 (E)	Shift lever in P	10 kΩ or higher

NG → See step   30 

OK: Go to next step 

Fig 3: Identifying Shift Lock Control ECU And Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E4 main body ECU connector.
2. Disconnect the E51 shift lock control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E4-2 (P) - E51-11 (P2)	Always	Below 1 Ω
   E51-3 (E) - Body ground	Always	Below 1 Ω
   E4-2 (P) or E51-11 (P2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

1. Remove the ST relay from the engine room relay block.
   Fig 4: Identifying Starter Cut Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE STARTER RELAY 

OK: Go to next step 

1. Disconnect the C19 park/neutral position switch connector.
   Fig 5: Identifying Park/Neutral Position Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   4 (B) - 5 (L)	P	Below 1 Ω
   4 (B) - 5 (L)	N	Below 1 Ω
   4 (B) - 5 (L)	Not in P or N	10 kΩ or higher

NG → See step   31 

OK: Go to next step 

Fig 6: Identifying Main Body ECU And Park/Neutral Position Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E1-8 (STR) - C19-4 (B)	Always	Below 1 Ω
   E1-8 (STR) or C19-4 (B) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 7: Identifying Starter Relay And Park/Neutral Position Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C19-5 (L) - Relay block ST relay terminal 1	Always	Below 1 Ω
   C19-5 (L) or Relay block ST relay terminal 1 - Body ground	Always	10 kΩ or higher
   Relay block ST relay terminal 2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

1. Remove the STOP fuse from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   STOP fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

Fig 8: Checking Stop Light Switch Operation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A30 stop light switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Stop light switch pin not pushed	Below 1 Ω
   3 - 4	Stop light switch pin pushed	Below 1 Ω
   1 - 2	Stop light switch pin pushed	10 kΩ or higher
   3 - 4	Stop light switch pin not pushed	10 kΩ or higher

NG → See step   32 

OK: Go to next step 

Fig 9: Identifying Stop Light Switch And Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the 2B main body ECU connector.
2. Disconnect the A30 stop light switch connector.
3. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A30-2 - Body ground	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2B-22 (STP) - A30-1	Always	Below 1 Ω
   2B-22 (STP) or A30-1 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

1. Replace the steering lock actuator assembly (steering lock ECU), refer to DISASSEMBLY .
2. Register the recognition code (ECU code), refer to REGISTRATION .
3. Check that the engine starts.

   OK

   Engine starts.

NG → See step   33 

OK → END 

1. Replace the certification ECU (smart key ECU assembly), refer to REMOVAL .
2. Register the recognition code (ECU code), refer to REGISTRATION .
3. Check that the engine starts.

   OK

   Engine starts.

NG → See step   33 

OK → END