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Starter Signal Circuit [09/2024 - ]: Procedure

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  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  16

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (STARTER SW) 
    1. Fully depress the clutch pedal. (for M/T Models)
    2. Check the value displayed on the GTS when the ignition switch is turned to ON and START positions.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW

      OK

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

      Result

      Result Proceed to
      OK A
      NG (for M/T Models) B
      NG (for A/T Models) C

    Result: 

    B 

    See step  10

    Result: 

    C 

    See step  13

    Result: 

    A 

    See step  3

  3. INSPECT ST RELAY 

    Refer to INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE ST RELAY 

    Result: 

    OK 

    See step  4

  4. INSPECT STARTER ASSEMBLY 

    Refer to INSPECTION [09/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY) 
    1. Remove the ST relay from 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  6

  6. 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  7

  7. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY) 
    1. Remove the ST relay from 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.
      GTY1251331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay

      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  8

  8. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND) 
    1. Remove the ST relay from 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
      1 (ST relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (ST relay) - A139-30 (STA) 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. INSPECT CLUTCH START SWITCH ASSEMBLY 

    Refer to INSPECTION [11/2022 - ]

    Result

    Result
    OK
    NG

    Result: 

    NG 

    REPLACE CLUTCH START SWITCH ASSEMBLY 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the ECM connector.
    2. Remove the ST relay from No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the clutch start switch assembly 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
      A177-1 - 2 (ST relay) Always Below 1 Ω
      A139-30 (STA) - 2 (ST relay) Always Below 1 Ω
      O175-3 (STA) - 2 (ST relay) Always Below 1 Ω
      O175-3 (STA), 2 (ST relay), A177-1 or A139-30 (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  12

  12. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - CLUTCH START SWITCH ASSEMBLY - ECM) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the clutch start 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
      O175-10 (STAR) - A177-2 Always Below 1 Ω
      O175-10 (STAR) - A139-23 (NSW) Always Below 1 Ω
      O175-10 (STAR), A139-23 (NSW) or A177-2 - 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 [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    Refer to INSPECTION [09/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the ECM connector.
    2. Remove the ST relay from No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the park/neutral position switch assembly 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
      C162-9 (L) - 2 (ST relay) Always Below 1 Ω
      A139-30 (STA) - 2 (ST relay) Always Below 1 Ω
      O175-3 (STA) - 2 (ST relay) Always Below 1 Ω
      O175-3 (STA), 2 (ST relay), C162-9 (L) or A139-30 (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  15

  15. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - 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
      O175-10 (STAR) - C162-4 (B) Always Below 1 Ω
      O175-10 (STAR) - A139-23 (NSW) Always Below 1 Ω
      O175-10 (STAR), A139-23 (NSW) or C162-4 (B) - 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 [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. READ VALUE USING GTS (STARTER SW) 
    1. Fully depress the clutch pedal. (for M/T Models)
    2. Check the value displayed on the GTS when the ignition switch is turned to ON and START positions.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW

      OK

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

      Result

      Result Proceed to
      OK A
      NG B

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2024 - ]

    Result: 

    B 

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

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