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Starter Signal Circuit [06/2018 - 01/2019]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. 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  2

  2. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    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 engine switch is turned to the on (IG) and START positions.

      OK

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

      Result

      Result Proceed to
      NG (for Continuously Variable Transaxle Models) A
      NG (for Manual Transaxle Models) B
      OK C

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  9

    Result: 

    A 

    See step  3

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

      Refer to INSPECTION [06/2018 - 09/2024]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019] 

    Result: 

    OK 

    See step  4

  4. 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
      O62-2 (STAR) - C62-4 (B) Always Below 1 Ω
      O62-2 (STAR) - A47-23 (NSW) Always Below 1 Ω
      O62-2 (STAR), C62-4 (B) or A47-23 (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  5

  5. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the ECM connector.
    4. Disconnect the TCM connector.
    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
      O62-1 (STA) - 1 (ST relay) Always Below 1 Ω
      C62-5 (L) - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      C80-28 (STA) - 1 (ST relay) Always Below 1 Ω
      O62-1 (STA), 1 (ST relay), C62-5 (L), A47-30 (STA) or C80-28 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART ENTRY AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT CLUTCH SWITCH ASSEMBLY 
    1. Inspect the clutch switch assembly.

      Refer to INSPECTION [06/2018 - 01/2019]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CLUTCH SWITCH ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH SWITCH ASSEMBLY - ECM) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the clutch 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
      O62-2 (STAR) - A60-2 Always Below 1 Ω
      O62-2 (STAR) - A47-23 (NSW) Always Below 1 Ω
      O62-2 (STAR), A60-2 or A47-23 (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  8

  8. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the clutch switch assembly connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 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
      O62-1 (STA) - 1 (ST relay) Always Below 1 Ω
      A60-1 - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      O62-1 (STA), 1 (ST relay), A60-1 or A47-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART ENTRY AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. INSPECT ST RELAY 
    1. Inspect the ST relay.

      Refer to INSPECTION [06/2018 - 03/2023]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ST RELAY 

    Result: 

    OK 

    See step  10

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

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019] 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 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 relay) - C82-1 (ST) Always Below 1 Ω
      3 (ST relay) or C82-1 (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  12

  12. 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 - C111-1 (B) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY) 
    GTY830844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
    *2 ST Relay
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 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 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY) 

    Result: 

    OK 

    See step  14

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (ST relay) - Body ground Always Below 1 Ω

      Result

      Result Proceed to
      OK (for Continuously Variable Transaxle Models) A
      OK (for Manual Transaxle Models) B
      NG C

    Result: 

    B 

    See step  16

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 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
      1 (ST relay) - O62-5 (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 [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ST relay) - A60-1 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 [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    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 engine switch is turned to the on (IG) and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Engine switch on (IG) 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 [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM) 

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