Engine does not Start: Procedure

1. Open and close the driver door when the engine switch is off.
2. Check that the engine starts.

   OK

   Engine starts.

   HINT: 

   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: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .

   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.

NG → See step   10 

OK: Go to next step 

1. Ensure the key is inside the cabin.
2. 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 → See step   11 

OK: Go to next step 

1. Ensure that there is fuel in the fuel tank and the key is inside the cabin.
2. Depress the brake pedal with the shift lever in P or N, and keep depressing the pedal.
3. Check that the engine cranks when the engine switch is pressed.

   OK

   Engine cranks.

OK → See step   9 

NG: Go to next step 

1. Use the Data List to check if the park / neutral position 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 in R or D	-

   OK

   When the shift lever is in P or N, ON is displayed on the Techstream.

NG → See step   12 

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 is depressed OFF: Brake pedal is released	-

   OK

   When the brake pedal is depressed, ON is displayed on the Techstream.

NG → See step   13 

OK: Go to next step 

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

   OK

   Steering lock can be released.

NG → See step   14 

OK: Go to next step 

1. Disconnect the A68 main body ECU connector.
   Fig 1: Identifying A68 Main Body ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Depress the brake pedal with the shift lever in P or N, and keep depressing the pedal.
3. 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 → See step   15 

OK → REPLACE MAIN BODY ECU 

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

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Engine Start Request (Past)	Starter request signal/OK or NG (PAST)	OK: ID code box receives immobilizer unset signal NG (PAST): ID code box does not receive immobilizer unset signal	-

   OK

   When ID code box receives immobilizer unset signal, OK is displayed on the Techstream.

NG → REPLACE CERTIFICATION ECU 

OK → REPLACE ID CODE BOX