Engine does not Start: Procedure

1. Measure the battery voltage.

   Standard voltage

   11 to 14 V

   HINT: 

   • It may be possible to tell whether the vehicle battery is discharged by operating the horn.
   • If the battery voltage is less than 11 V, charge or replace it.

NEXT: Go to next step 

1. Using the Techstream, confirm the output of DTCs for all systems.

   OK

   No DTCs are output

NG → See step   35 

OK: Go to next step 

1. If the problem occurs in certain locations or times of day, the possibility of wave interference is high.

   HINT: 

   Whether or not the problem is due to wave interference can be checked by holding the electrical key transmitter assembly near the door control receiver (RF band).

NEXT: Go to next step 

1. Get into the vehicle while carrying an electrical key transmitter assembly.
2. Move the shift lever to P*.
   • *: for Automatic Transmission
3. With the brake pedal*1 or clutch pedal*2 released, check that pressing the engine switch causes the power source mode to change.
   • *1: for Automatic Transmission
   • *2: for Manual Transmission
   RESULT
   
   

   Result	Proceed to
   Power source mode changes as follows (normal): off → on (ACC) → on (IG) → off	A
   Power source mode does not change to on (IG) or on (ACC)	B
   Power source mode does not change to on (IG) but does change to on (ACC)	C
   Power source mode does not change to on (ACC) but does change to on (IG)	D

B → See step   36 

C → See step   37 

D → See step   38 

A: Go to next step 

1. Get into the vehicle while carrying the electrical key transmitter assembly.
2. Move the shift lever to P*.
   • *: for Automatic Transmission
3. Depress the brake pedal*1 or clutch pedal*2.
   • *1: for Automatic Transmission
   • *2: for Manual Transmission
4. Confirm that the entry key indicator in the combination meter assembly illuminates in green, and then press the engine switch and check that the engine cranks.

   OK

   Engine cranks

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   31 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Key / Data List.
5. According to the display on the Techstream, read the Data List.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Immobilizer	State of immobilizer system determined by certification ECU (smart key ECU assembly) / Set or Unset	Set: Engine immobilizer set (engine start prohibited) (engine switch off) Unset: Engine immobilizer unset (engine start permitted) (engine switch on (ACC) or on (IG))	When the immobilizer cannot be unset, this item can be used to determine whether the certification ECU (smart key ECU assembly) is part of the problem. The engine cannot be started when this item displays "Set"

   OK

   The Data List item changes to "Unset" when the engine switch is turned on (ACC) or on (IG).

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (w/ ID Code Box)	B
   NG (w/o ID Code Box)	C

B → See step   10 

C → See step   11 

A: Go to next step 

1. Get into the vehicle while carrying the electrical key transmitter assembly, move the shift lever to P*1, depressing the brake pedal*1 or clutch pedal*2 and check that the entry key indicator light in the combination meter assembly changes.
   • *1: for Automatic Transmission
   • *2: for Manual Transmission

   OK

   The entry key indicator light in green.

   HINT: 

   If the entry key indicator light in the combination meter assembly illuminates green when the procedure above is performed, the P, N and brake signals*1 or clutch signal*2 can be considered to be normal.

   • *1: for Automatic Transmission
   • *2: for Manual Transmission
   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (for Automatic Transmission)	B
   NG (for Manual Transmission)	C

B → See step   14 

C → See step   20 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Starter Request Signal	Condition of engine start command signal / OFF or ON	OFF: Engine switch released after approximately 1 second elapses ON: Engine switch pressed and held while carrying electrical key transmitter assembly with shift lever in P*1 and brake pedal*1 or clutch pedal*2 depressed	When the engine cannot be started due to a start request signal malfunction, OFF is displayed. When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain amount of time.

   • *1: for Automatic Transmission
   • *2: for Manual Transmission

   OK

   The display changes in response to the operation of the engine switch.

   NOTE:

   Make sure that the entry key indicator in the combination meter assembly illuminates in green before pressing the engine switch.

NG → See step   34 

OK: Go to next step 

1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the A33 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D48-7 (STSW) - A33-17 (STSW)	Always	Below 1 Ω
   D48-7 (STSW) or A33-17 (STSW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   31 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Key / Data List.
5. According to the display on the Techstream, read the Data List.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: S code has not been registered for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK (S code certification result normal) appears on the screen.

NG → See step   23 

OK: Go to next step 

1. Check that the steering unlocks when the engine switch is turned on (ACC).

   OK

   The steering unlocks.

NG → See step   25 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Key / Data List.
5. According to the display on the Techstream, read the Data List.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Immobilizer	State of immobilizer system determined by certification ECU (smart key ECU assembly) / Set or Unset	Unset: Engine immobilizer unset (engine switch on [ACC] or on [IG]) Set: Engine immobilizer set (engine switch off)	When the immobilizer cannot be unset, this item can be used to determine whether the certification ECU (smart key ECU assembly) is part of the problem. The engine cannot be started when this item displays "Set"

   OK

   The Data List item changes to "Unset" when the engine switch is turned on (ACC) or on (IG).

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (w/ ID Code Box)	B
   NG (w/o ID Code Box)	C

B → See step   29 

C → See step   34 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Starter Request Signal	Condition of engine start command signal / OFF or ON	OFF: Engine switch released after approximately 1 second elapses ON: Engine switch pressed and held while carrying electrical key transmitter assembly with shift lever in P*1 and brake pedal*1 or clutch pedal*2 depressed	When the engine cannot be started due to a start request signal malfunction, OFF is displayed. When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain amount of time.

   • *1: for Automatic Transmission
   • *2: for Manual Transmission

   OK

   The display changes in response to the operation of the engine switch.

   NOTE:

   Make sure that the entry key indicator in the combination meter assembly illuminates in green before pressing the engine switch.

NG → See step   34 

OK → END 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Neutral SW / Clutch SW	Shift position (P, N) / OFF or ON	OFF: Shift lever not in P or N or released ON: Shift lever in P or N depressed	Use this item to help determine if the park/neutral position switch is malfunctioning. The engine cannot be started when this item is "OFF".

   Enter the following menus: Powertrain / Engine / Data List.

   ENGINE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Shift SW Status (P Range)	Condition of park/neutral position switch / OFF or ON	OFF: Shift lever not in P ON: Shift lever in P	When malfunctioning, the engine will not crank.
   Shift SW Status (N Range)	Condition of park/neutral position switch / OFF or ON	OFF: Shift lever not in N ON: Shift lever in N	When malfunctioning, the engine will not crank.

   OK

   The items in the Data List change according to the shift position.

NG → See step   16 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light Switch1	State of brake pedal / OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	Use this item to determine whether the stop light switch is malfunctioning. The engine cannot be started when this item is "OFF". When this item is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

   OK

   The item in the Data List changes when the brake pedal is depressed and released.

NG → See step   18 

OK → See step   34 

1. Remove the park/neutral position switch assembly. Refer to REMOVAL [03/2012 - ] .
2. Inspect the park/neutral position switch assembly. Refer to INSPECTION [03/2012 - ] .

NG → See step   41 

OK: Go to next step 

1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the L2 park/neutral position switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D48-5 (N-SW) - L2-4	Always	Below 1 Ω
   L2-5 - Body ground	Always	Below 1 Ω
   D48-5 (N-SW) or L2-4 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   34 

1. Remove the stop light switch assembly. Refer to REMOVAL [03/2012 - ] .
2. Inspect the stop light switch assembly. Refer to INSPECTION [03/2012 - ] .

NG → See step   33 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   34 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Neutral SW / Clutch SW	State of clutch pedal / OFF or ON	OFF: Clutch pedal released ON: Clutch pedal depressed	Use this item to help determine if the clutch position switch is malfunctioning. The engine cannot be started when this item is "OFF".

   OK

   ON (clutch pedal depressed) and OFF (clutch pedal released) appear on the screen according to the condition of the clutch pedal.

NG → See step   21 

OK → See step   34 

1. Remove the clutch start switch assembly. Refer to REMOVAL [03/2012 - ] .
2. Inspect the clutch start switch assembly. Refer to INSPECTION [03/2012 - ] .

NG → See step   40 

OK: Go to next step 

1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the A20 clutch start switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D48-10 (CLUT) - A20-2	Always	Below 1 Ω
   D48-10 (CLUT) or A20-2 - Body ground	Always	10 kΩ or higher

4. Reconnect the A20 clutch start switch assembly connector.
5. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying D48 Certification ECU (Smart Key ECU Assembly) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D48-10 (CLUT) - Body ground	Clutch pedal released → Clutch pedal depressed	1 V or less → 9 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   34 

1. Replace the certification ECU (smart key ECU assembly) with a new one. Refer to REMOVAL [05/2013 - ] .
   NOTE:

   When the certification ECU (smart key ECU assembly) is replaced, it is also necessary to replace all registered electrical key transmitter sub-assemblies.

2. Perform the registration procedures. Refer to REGISTRATION [05/2013 - ] .
3. Use the Data List to check if S code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: S code has not been registered for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK (S code certification result normal) appears on the screen.

NG → See step   24 

OK → END 

1. Replace the ID code box (immobilizer code ECU) with a new one. Refer to REMOVAL [05/2013 - ] .
2. Perform the registration procedures. Refer to REGISTRATION [05/2013 - ] .
3. Use the Data List to check if S code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: S code has not been registered for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK (S code certification result normal) appears on the screen.

NEXT → END 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Unlock Switch	State of steering unlock sensor signal output from steering lock actuator assembly / OFF or ON	OFF: Steering locked ON: Steering unlocked	When the shift lever is in P and the engine switch is off, if any door is opened or closed, the steering is locked. When the electrical key transmitter assembly is inside the vehicle and the engine switch is turned on (ACC) or on (IG), the steering unlocks. The engine cannot be started when the steering unlock signal is off.

   OK

   The item in the Data List indicates "ON" (the steering is unlocked).

NG → See step   26 

OK → See step   32 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Key / Data List.
5. According to the display on the Techstream, read the Data List.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between ID code box (immobilizer code ECU) and steering lock ECU (steering lock actuator assembly) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: L code has not been registered for the ID code box (immobilizer code ECU) or steering lock ECU (steering lock actuator assembly). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   The Data List item changes to "OK" when the electrical key transmitter assembly is inside the vehicle.

   HINT: 

   Reasons for verification failure:

   • The steering lock ECU, ID code box (immobilizer code ECU)* is malfunctioning.
   • There is a problem with the communication between ECUs.
   • An ECU is replaced, but is not registered.
   • An ECU is replaced with an ECU which has a code already stored in it.
   • *: w/ ID Code Box

NG → See step   28 

OK: Go to next step 

1. Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to REMOVAL [05/2013 - ] .
2. Perform the registration procedures. Refer to REGISTRATION [05/2013 - ] .
3. Turn the engine switch on (IG).
4. Operate the steering wheel and check the steering condition.

NEXT → END 

1. Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to REMOVAL [05/2013 - ] .
2. Perform the registration procedures. Refer to REGISTRATION [05/2013 - ] .
3. Use the Data List to check if L code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between ID code box (immobilizer code ECU) and steering lock ECU (steering lock actuator assembly) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: L code has not been registered for the ID code box (immobilizer code ECU) or steering lock ECU (steering lock actuator assembly). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK (L code certification result normal) appears on the screen.

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (w/ ID Code Box)	B
   NG (w/o ID Code Box)	C

B → See step   39 

C → See step   34 

A → END 

1. Replace the certification ECU (smart key ECU assembly) with a new one. Refer to REMOVAL [05/2013 - ] .
2. Perform the registration procedures. Refer to REGISTRATION [05/2013 - ] .
3. Use the Data List to check if S code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: S code has not been registered for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK (S code certification result normal) appears on the screen.

NG → See step   30 

OK → END 

1. Replace the ID code box (immobilizer code ECU) with a new one. Refer to REMOVAL [05/2013 - ] .
2. Perform the registration procedures. Refer to REGISTRATION [05/2013 - ] .
3. Use the Data List to check if S code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: S code has not been registered for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU). The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK (S code certification result normal) appears on the screen.

NEXT → END