LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2019 >> UX 200 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Access System W/ Push-Button Start (Start Function) (Diagnostic Codes & Symptom Tests (1 Of 2)) (Except Hybrid) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) >> Engine does not Start [10/2018 - 07/2022] >> Procedure

Engine does not Start [10/2018 - 07/2022]: Procedure

  1. CHECK ENGINE CRANKING OPERATION 
    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.
    2. Move the shift lever to P.
    3. Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch and check that the engine cranks.

      Result

      Result Proceed to
      Engine cranks and initial combustion occurs A
      Engine cranks but initial combustion does not occur B
      Engine does not crank C

    Result: 

    A 

    GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly). Refer to  Immobiliser System does not Operate Properly [10/2018 - 07/2022] 

    Result: 

    B 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022] 

    Result: 

    C 

    See step  2

  2. CHECK ENGINE SWITCH CONDITION 
    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.
    2. Move the shift lever to P.
    3. With the brake pedal released, check that pressing the engine switch causes the power source mode to change.

      Result

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

    Result: 

    B 

    GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG and ACC)). Refer to  Power Source Mode does not Change to ON (IG and ACC) [10/2018 - 08/2021]  , or refer to  Power Source Mode does not Change to ON (IG and ACC) [08/2021 - 07/2022] 

    Result: 

    C 

    GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (ACC)). Refer to  Power Source Mode does not Change to ON (ACC) [10/2018 - 07/2022] 

    Result: 

    D 

    GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG)). Refer to  Power Source Mode does not Change to ON (IG) [10/2018 - 07/2022] 

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH1) 
    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. Read the Data List according to the display on the Techstream.

      Body Electrical > Power Source Control > Data List 

      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 if the stop light switch assembly is malfunctioning.
      • The engine cannot be started when this item is OFF.
      • If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

      Body Electrical > Power Source Control > Data List 

      Tester Display
      Stop Light Switch1

      OK

      The Techstream display changes correctly in response to the brake pedal operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (NEUTRAL SW/ CLUTCH SW, SHIFT POSITION P OR N) 
    1. Enter the following menus: Body Electrical / Power Source Control or Starting Control / Data List.
    2. Read the Data List according to the display on the Techstream.

      Body Electrical > Power Source Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Neutral SW/ Clutch SW Shift position (P and N) OFF or ON OFF: Shift lever in any position other than P or N
      ON: Shift lever in P or N
      • Use this item to determine if the park/neutral position switch is malfunctioning.
      • When the engine cannot be started due to a park/neutral position switch malfunction, OFF is displayed.

      Body Electrical > Power Source Control > Data List 

      Tester Display
      Neutral SW/ Clutch SW

      Body Electrical > Starting Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift Position P or N Park/Neutral position switch status OFF or ON OFF: Shift lever not in P or N
      ON: Shift lever in P or N      		 When OFF is displayed, the engine will not crank.

      Body Electrical > Starting Control > Data List 

      Tester Display
      Shift Position P or N

      OK

      The Techstream display changes correctly in response to the shift lever operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  5

  5. READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL) 
    1. Enter the following menus: Body Electrical / Power Source Control / Data List.
    2. Read the Data List according to the display on the Techstream.

      Body Electrical > Power Source Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Starter Request Signal Engine start request signal status OFF or ON OFF: The engine switch is not pressed
      ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held
      • 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 period of time.

      Body Electrical > Power Source Control > Data List 

      Tester Display
      Starter Request Signal
      NOTE:

      Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch.

      OK

      The Techstream display changes correctly in response to the engine switch operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  6

  6. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.
    2. Move the shift lever to P.
    3. Enter the following menus: Body Electrical / Starting Control / Data List.
    4. According to the display on the Techstream, read the Data List while pressing the engine switch with the brake pedal depressed.

      Body Electrical > Starting Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Starter SW Starter operation request OFF or ON OFF: Starter operation not requested
      ON: Starter operation requested      		 When OFF is displayed, the engine will not crank.

      Body Electrical > Starting Control > Data List 

      Tester Display
      Starter SW

      OK

      The Techstream display changes.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  7

  7. INSPECT ST NO. 1 RELAY 
    1. Inspect the ST NO. 1 relay.

      Refer to INSPECTION [10/2018 - 07/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ST NO. 1 RELAY 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST NO. 1 RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      No. 1 engine room relay block assembly ST NO. 1 relay terminal 2 - Body ground Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher* → 1.0 V or less
      GTY801829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block
      (ST NO. 1 Relay Holder)

      HINT: 

      *: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - AUXILIARY BATTERY AND GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      No. 1 engine room relay block assembly ST NO. 1 relay terminal 1 - Body ground Always Below 1 Ω
      GTY761650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block assembly
      (ST NO. 1 Relay Holder)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      No. 1 engine room relay block ST NO. 1 relay terminal 5 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - ST NO. 1 RELAY) 
    1. Disconnect the C38 starter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      No. 1 engine room relay block assembly ST NO. 1 relay terminal 3 - C38-1 (ST) Always Below 1 Ω
      No. 1 engine room relay block assembly ST NO. 1 relay terminal 3 or C38-1 (ST) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - AUXILIARY BATTERY) 
    1. Disconnect the C56 starter assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C56-1 (B) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STARTER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY807629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      N60-9 (STAR) - Body ground Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher* → 1.0 V or less

      HINT: 

      *: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH) 
    1. Disconnect the N60 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the C26 park/neutral position switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N60-9 (STAR) - C26-4 (B) Always Below 1 Ω
      N60-9 (STAR) or C26-4 (B) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Install the ST NO. 1 relay to the No. 1 engine room relay block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      N60-20 (STA) - Body ground Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher* → 1.0 V or less
      GTY807625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

      HINT: 

      *: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST NO. 1 RELAY) 
    1. Disconnect the N60 certification ECU (smart key ECU assembly) connector.
      GTY761650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block
      (ST NO. 1 Relay Holder)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N60-20 (STA) - No. 1 engine room relay block and No. 1 junction block assembly ST NO. 1 relay terminal 2 Always Below 1 Ω
      N60-20 (STA) or No. 1 engine room relay block and No. 1 junction block assembly ST NO. 1 relay terminal 2 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST NO. 1 RELAY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C26-5 (L) - No. 1 engine room relay block assembly ST NO. 1 relay terminal 2 Always Below 1 Ω
      C26-5 (L) or No. 1 engine room relay block assembly ST NO. 1 relay terminal 2 - Other terminals and body ground Always 10 kΩ or higher
      GTY761650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block
      (ST NO. 1 Relay Holder)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. CHECK STEERING LOCK FUNCTION 
    1. Check that the steering unlocks when the engine switch is turned on (ACC).

      OK

      The steering unlocks.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    GO TO OTHER PROBLEM (Unable to Unlock Steering Wheel (Engine cannot Start)). Refer to  Unable to Unlock Steering Wheel (Engine cannot Start) [10/2018 - 07/2022] 

  18. INSPECT PARK/NEUTRAL POSITION SWITCH 
    1. Remove the park/neutral position switch.

      Refer to REMOVAL [10/2018 - 07/2022]

    2. Inspect the park/neutral position switch.

      Refer to ON-VEHICLE INSPECTION [10/2018 - 07/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH) 
    1. Disconnect the N60 certification ECU (smart key ECU assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N60-9 (STAR) - C26-4 (B) Always Below 1 Ω
      N60-9 (STAR) or C26-4 (B) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  20. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Inspect the stop light switch assembly.

      Refer to ON-VEHICLE INSPECTION [10/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    OK 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY) 
    1. Disconnect the A42 stop light switch assembly connector.
    2. Disconnect the N61 certification ECU (smart key ECU assembly) connector.
    3. Disconnect the A36 ECM connector.
    4. Disconnect the A38 skid control ECU (brake actuator assembly) connector.
    5. Disconnect the F17 shift lock control unit assembly connector.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N61-25 (STP1) - A42-3 (L) Always Below 1 Ω
      N61-25 (STP1) or A42-3 (L) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals