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Starter Signal Circuit [12/2021 - ]: Procedure

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  1. CHECK IF VEHICLE IS EQUIPPED WITH STOP AND START SYSTEM 
    1. Confirm the vehicle specifications.

      Result

      Result  Proceed to
      w/ Stop and Start System A
      w/o Stop and Start System B

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  2

  2. CHECK WHETHER ENGINE CAN BE CRANKED 
    1. Check if the engine can be cranked.

      Result

      Result Proceed to
      Engine cannot be cranked A
      Engine can be cranked B

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    5. Check the value displayed on the Techstream when the ignition switch is turned to the ON and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Ignition switch ON OFF
      Engine started ON

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  4

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

      Refer to INSPECTION [12/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ST NO. 1 RELAY 

    Result: 

    OK 

    See step  5

  5. INSPECT STARTER ASSEMBLY 
    1. Inspect the starter assembly.

      Refer to INSPECTION [12/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY 

    Refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - STARTER ASSEMBLY) 
    1. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    2. Disconnect the starter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (ST NO. 1 relay) - C71-2 (SL1) Always Below 1 Ω
      3 (ST NO. 1 relay) or C71-2 (SL1) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND) 
    1. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ST NO. 1 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST NO. 1 RELAY) 
    GTY1107820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and Junction Block Assembly
    *2 ST NO. 1 Relay
    1. Remove the ST NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      5 (ST NO. 1 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST NO 1 RELAY) 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST NO. 1 RELAY) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C31-9 (L) - 2 (ST NO. 1 relay) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK STOP AND START SYSTEM 
    1. Check the stop and start system.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - 10/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR STOP AND START SYSTEM 

    Result: 

    OK 

    See step  11

  11. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Inspect the park/neutral position switch assembly.

      for 2WD: Refer to INSPECTION [11/2018 - ]

      for AWD: Refer to INSPECTION [11/2018 - ]

      Result

      Result Proceed to
      OK (w/ Smart Key System) A
      OK (w/o Smart Key System) B
      NG C

    Result: 

    B 

    See step  14

    Result: 

    C 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    for 2WD: Refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    for AWD: Refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    A 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ENGINE STOP AND START ECU - ST NO. 1 RELAY - CERTIFICATION ECU - ECM) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Disconnect the engine stop and start ECU connector.
    3. Disconnect the ECM connector.
    4. Remove the ST NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
    5. Disconnect the certification ECU (smart key ECU assembly) connector.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C31-9 (L) - A34-21 (STA) Always Below 1 Ω
      C31-9 (L) - A15-20 (STA) Always Below 1 Ω
      C31-9 (L) - A24-30 (STA) Always Below 1 Ω
      C31-9 (L), A34-21 (STA), A24-30 (STA), 2 (ST NO. 1 relay) or A15-20 (STA) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM - ENGINE STOP AND START ECU) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the ECM connector.
    4. Disconnect the engine stop and start ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-9 (STAR) - C31-4 (B) Always Below 1 Ω
      A15-9 (STAR) - A24-23 (NSW) Always Below 1 Ω
      A15-9 (STAR) - A34-17 (CLL) Always Below 1 Ω
      A15-9 (STAR), C31-4 (B), A24-23 (NSW) or A34-17 (CLL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART KEY SYSTEM 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - 10/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ENGINE STOP AND START ECU - ECM - ST NO. 1 RELAY) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Disconnect the engine stop and start ECU connector.
    3. Disconnect the ECM connector.
    4. Remove the ST NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C31-9 (L) - A34-21 (STA) Always Below 1 Ω
      C31-9 (L) - A24-30 (STA) Always Below 1 Ω
      C31-9 (L), A34-21 (STA), A24-30 (STA) or 2 (ST NO. 1 relay) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM - ENGINE STOP AND START ECU) 
    1. Disconnect the ignition switch assembly connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the ECM connector.
    4. Disconnect the engine stop and start ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G28-5 (ST1) - C31-4 (B) Always Below 1 Ω
      G28-5 (ST1) - A24-23 (NSW) Always Below 1 Ω
      G28-5 (ST1) - A34-17 (CLL) Always Below 1 Ω
      G28-5 (ST1), C31-4 (B), A24-23 (NSW) or A34-17 (CLL) - 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. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Inspect the ignition switch assembly.

      Refer to INSPECTION [11/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY) 

    Result: 

    NG 

    REPLACE IGNITION SWITCH ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

  17. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    5. Check the value displayed on the Techstream when the ignition switch is turned to the ON and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Ignition switch ON OFF
      Engine started ON

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [08/2020 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO. 1 RELAY - ECM) 

  18. CHECK WHETHER ENGINE CAN BE CRANKED 
    1. Check if the engine can be cranked.

      Result

      Result Proceed to
      Engine cannot be cranked A
      Engine can be cranked B

    Result: 

    B 

    See step  33

    Result: 

    A 

    See step  19

  19. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    5. Check the value displayed on the Techstream when the ignition switch is turned to the ON and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Ignition switch ON OFF
      Engine started ON

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  27

    Result: 

    OK 

    See step  20

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

      Refer to PROCEDURE - Step 1

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ST NO. 1 RELAY 

    Result: 

    OK 

    See step  21

  21. INSPECT STARTER ASSEMBLY 
    1. Inspect the starter assembly.

      Refer to INSPECTION [10/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY 

    Refer to REMOVAL [08/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    OK 

    See step  22

  22. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - STARTER ASSEMBLY) 
    1. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    2. Disconnect the starter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (ST NO. 1 relay) - C42-1 (ST) Always Below 1 Ω
      3 (ST NO. 1 relay) or C42-1 (ST) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  23

  23. CHECK TERMINAL VOLTAGE (BATTERY - STARTER ASSEMBLY) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the cable from the positive (+) battery terminal.
    3. Disconnect the starter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Positive (+) battery terminal - D2-1 (B) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  24

  24. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST NO. 1 RELAY) 
    GTY923546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and Junction Block Assembly
    *2 ST NO. 1 Relay
    1. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      5 (ST NO. 1 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST NO. 1 RELAY) 

    Result: 

    OK 

    See step  25

  25. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND) 
    1. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ST NO. 1 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  26

  26. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) 
    1. Remove the ST NO. 1 relay from the No. 1 engine room relay block and junction block assembly.
    2. Disconnect the 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
      2 (ST NO. 1 relay) - C31-9 (L) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [08/2020 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  27. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Inspect the park/neutral position switch.

      Result

      Result Proceed to
      OK (w/ Smart Key System) A
      OK (w/o Smart Key System) B
      NG C

    Result: 

    B 

    See step  30

    Result: 

    C 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    Result: 

    A 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    3. Disconnect the ECM connector.
    4. Disconnect the certification ECU (smart key ECU assembly) connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-20 (STA) - 2 (ST NO. 1 relay) Always Below 1 Ω
      C31-9 (L) - 2 (ST NO. 1 relay) Always Below 1 Ω
      A24-30 (STA) - 2 (ST NO. 1 relay) Always Below 1 Ω
      A15-20 (STA), 2 (ST NO. 1 relay), C31-9 (L) or A24-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  29

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-9 (STAR) - C31-4 (B) Always Below 1 Ω
      A15-9 (STAR) - A24-23 (NSW) Always Below 1 Ω
      A15-9 (STAR), C31-4 (B) or A24-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART KEY SYSTEM 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - 10/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  30. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Remove the ST NO. 1 relay from No. 1 engine room relay block and junction block assembly.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C31-9 (L) - 2 (ST NO. 1 relay) Always Below 1 Ω
      A24-30 (STA) - 2 (ST NO. 1 relay) Always Below 1 Ω
      C31-9 (L), 2 (ST NO. 1 relay) or A24-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  31

  31. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM) 
    1. Disconnect the ignition switch assembly connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G28-5 (ST1) - C31-4 (B) Always Below 1 Ω
      G28-5 (ST1) - A24-23 (NSW) Always Below 1 Ω
      G28-5 (ST1), C31-4 (B) or A24-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  32

  32. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Inspect the ignition switch assembly.

      Refer to INSPECTION [11/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY) 

    Result: 

    NG 

    REPLACE IGNITION SWITCH ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

  33. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    5. Check the value displayed on the Techstream when the ignition switch is turned to the ON and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Ignition switch ON OFF
      Engine started ON

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [08/2020 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO. 1 RELAY - ECM) 

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