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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System - Diagnostic Codes (18 Of 18) & Circuit Tests (1 Of 3) >> Hybrid Control System >> Drive Start Control [12/2023 - ] >> Procedure

Drive Start Control [12/2023 - ]: Procedure

  1. SYMPTOM CONFIRMATION 
    1. Interview the customer to confirm the problem.

      Result

      Proceed to
      Hunting
      Hesitation/poor acceleration

    Result: 

    Hesitation/poor acceleration 

    See step  7

    Result: 

    Hunting 

    See step  2

  2. PAST ACTIVATION CONFIRMATION 
    1. Check if the customer operated the vehicle in a way that would cause the drive start control to operate.

      HINT: 

      Drive Start Control Activation Conditions 

      Shift control 

      1. Activation conditions
      • Pattern A (When all of the following conditions are met, control starts.)
        • The accelerator pedal is open by approximately 1/5 or more.
        • The shift state is changed from park (P) to any forward shift state (drive (D) or manual (B)) or reverse (R).
      • Pattern B (When all of the following conditions are met, control starts.)
        • The accelerator pedal is open by approximately 1/5 or more.
        • The shift state is changed from reverse (R) to any forward shift state (drive (D) or manual (B)), any forward shift state (drive (D) or manual (B)) to reverse (R), or neutral (N) to reverse (R).
          GTY993412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

          If the shift lever is moved to attempt to change the shift state from park (P) when the accelerator pedal is depressed, the shift state will not change and drive-start control will not operate.

      • Items Controlled
        • FC system output is restricted.
      • Deactivation Conditions
        • The accelerator pedal is released.
        • The shift state is in park (P) or neutral (N).

      Reverse control 

      1. Activation conditions
      • The shift state is in reverse (R).
      • The accelerator pedal is depressed excessively.
        GTY980570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • Items Controlled
        • Driving force is restricted.
      • Deactivation Conditions
        • The accelerator pedal is released.
        • The shift state is changed to any shift state other than reverse (R).

      HINT: 

      • The driving force restricted level differs between pattern A, pattern B and Reverse control.
      • During reverse control or shift control, driving force is adjusted based on the road gradient and steering angle.

      Result

      Result Proceed to
      Performed A
      Not performed B

    Result: 

    B 

    SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE). Refer to  PROBLEM SYMPTOMS TABLE [12/2023 - ] 

    Result: 

    A 

    See step  3

  3. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Enter the following menus: System Select / Health Check.
    2. Turn the ignition switch off.

      Result

      Proceed to
      DTCs are not output
      DTC is output
    3. Check the DTCs.

    Result: 

    DTC is output 

    GO TO DTC CHART 

    Result: 

    DTCs are not output 

    See step  4

  4. READ VALUE USING GTS (FR, FL, RR, RL WHEEL SPEED) 
    1. Read the value displayed on the GTS.

      Chassis > Brake/EPB > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed

      HINT: 

      If the Data List updates slowly, perform measurement after selecting only the "FR Wheel Speed", "FL Wheel Speed", "RR Wheel Speed" and "RL Wheel Speed" items.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition
      FR Wheel Speed Front speed sensor RH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front speed sensor LH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) When driving at constant speed: No large fluctuations
      RR Wheel Speed Rear speed sensor RH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) When driving at constant speed: No large fluctuations
      RL Wheel Speed Rear speed sensor LH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) When driving at constant speed: No large fluctuations

      Standard

      Condition Specified Condition
      Vehicle stopped 0 km/h (0 mph)
      Vehicle being driven at constant speed between 16 to 64 km/h (10 to 40 mph) No large fluctuations when driving at a constant speed
      WARNING:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

      Result

      Proceed to
      OK
      NG
    2. Turn the ignition switch off.

    Result: 

    NG 

    INSPECT FRONT OR REAR SPEED SENSOR. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2023 - ] 

    Result: 

    OK 

    See step  5

  5. READ VALUE USING GTS (VEHICLE SPEED) 
    1. Read the value of "Vehicle Speed" displayed on the GTS.

      Powertrain > EV > Data List 

      Tester Display
      Vehicle Speed

      HINT: 

      If the Data List updates slowly, perform measurement after selecting only the "Vehicle Speed" item.

      Powertrain > EV > Data List 

      Tester Display Measurement Item Range Normal Condition
      Vehicle Speed Vehicle speed Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Vehicle stopped: 0 km/h (0 mph)
      While driving at a constant speed: No significant fluctuation

      Standard

      Inspection Condition Specified Condition
      Vehicle stopped 0 km/h (0 mph)
      Vehicle being driven at a constant speed
      (16 to 64 km/h (10 to 40 mph))      		 No large fluctuations in displayed speed
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

      Result

      Proceed to
      OK
      NG
    2. Turn the ignition switch off.

    Result: 

    NG 

    INSPECT ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2023 - ] 

    Result: 

    OK 

    See step  6

  6. READ VALUE USING GTS (LATERAL G, FORWARD AND REARWARD G) 
    1. Read the value displayed on the GTS.

      Chassis > Brake/EPB > Data List 

      Tester Display
      Forward and Rearward G

      HINT: 

      If the Data List updates slowly, perform measurement after selecting only the " Lateral G" and " Forward and Rearward G " items.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition
      Forward and Rearward G Forward and rearward G Min.: -25.105 m/s2
      Max.: 24.908 m/s2      		 During deceleration: -25.105 to 0.000 m/s2
      During acceleration: 0.000 to 24.908 m/s2

      Standard

      Condition Specified Condition
      During deceleration Value changes with vehicle speed
      During acceleration Value changes with vehicle speed
      WARNING:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

      Result

      Proceed to
      OK
      NG
    2. Turn the ignition switch off.

    Result: 

    OK 

    SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE). Refer to  PROBLEM SYMPTOMS TABLE [12/2023 - ] 

    Result: 

    NG 

    INSPECT ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2023 - ] 

  7. PAST ACTIVATION CONFIRMATION 
    1. Check if the customer operated the vehicle in a way that would cause the drive start control to operate.

      HINT: 

      Drive Start Control Activation Conditions 

      Shift control 

      1. Activation conditions
      • Pattern A (When all of the following conditions are met, control starts.)
        • The accelerator pedal is open by approximately 1/5 or more.
        • The shift state is changed from park (P) to any forward shift state (drive (D) or manual (B)) or reverse (R).
      • Pattern B (When all of the following conditions are met, control starts.)
        • The accelerator pedal is open by approximately 1/5 or more.
        • The shift state is changed from reverse (R) to any forward shift state (drive (D) or manual (B)), any forward shift state (drive (D) or manual (B)) to reverse (R), or neutral (N) to reverse (R).
          GTY993412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

          If the shift lever is moved to attempt to change the shift state from park (P) when the accelerator pedal is depressed, the shift state will not change and drive-start control will not operate.

      • Items Controlled
        • FC system output is restricted.
      • Deactivation Conditions
        • The accelerator pedal is released.
        • The shift state is in park (P) or neutral (N).

      Reverse control 

      1. Activation conditions
      • The shift state is in reverse (R).
      • The accelerator pedal is depressed excessively.
        GTY980570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • Items Controlled
        • FC system output is restricted.
      • Deactivation Conditions
        • The accelerator pedal is released.
        • The shift state is changed to any shift state other than reverse (R).

      HINT: 

      • The FC system output restricted level differs between pattern A, pattern B and Reverse control.
      • During reverse control or shift control, FC system output is adjusted based on the road gradient and steering angle.

      Result

      Result Proceed to
      Not performed A
      Performed B

      HINT: 

      If the customer operated the vehicle in a way which caused the drive start control to operate, explain the operation of the system to the customer and that the operation is not a malfunction.

    Result: 

    B 

    SYSTEM NORMAL 

    Result: 

    A 

    See step  8

  8. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Enter the following menus: System Select / Health Check.
    2. Check the DTCs.

      Result

      Result Proceed to
      DTCs are not output A
      DTC is output B
    3. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART 

    Result: 

    A 

    See step  9

  9. READ VALUE USING GTS (SHIFT POSITION) 
    1. Enter the following menus: Powertrain / EV / Data List / Shift Position.

      Powertrain > EV > Data List 

      Tester Display
      Shift Position
    2. Read the value displayed on the GTS.

      Powertrain > EV > Data List 

      Tester Display Measurement Item Range Normal Condition
      Shift Position Current shift state P / R / N / D / B Matches currently selected shift state:
      park (P), reverse (R), neutral (N), drive (D) or manual (B)

      OK

      Condition Specified Condition
      Select shift state Matches currently selected shift state
    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO ELECTRONIC SHIFT LEVER SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2023 - ] 

    Result: 

    OK 

    See step  10

  10. READ VALUE USING GTS (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE %, ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE %) 
    1. Read the value displayed on the GTS.

      Powertrain > EV > Data List 

      Tester Display
      Accelerator Position Sensor No. 1 Voltage %
      Accelerator Position Sensor No. 2 Voltage %

      HINT: 

      If the Data List updates slowly, perform measurement after selecting only the "Accelerator Position Sensor No. 1 Voltage %" and "Accelerator Position Sensor No. 2 Voltage %" items.

      Powertrain > EV > Data List 

      Tester Display Measurement Item Range Normal Condition
      Accelerator Position Sensor No. 1 Voltage % Accelerator pedal position sensor No. 1 Min.: 0.0%, Max.: 100.0% Accelerator pedal depressed:
      Changes with accelerator pedal pressure
      Accelerator Position Sensor No. 2 Voltage % Accelerator pedal position sensor No. 2 Min.: 0.0%, Max.: 100.0% Accelerator pedal depressed:
      Changes with accelerator pedal pressure

      OK

      Condition Specified Condition
      Accelerator Pedal Released → Depressed Values smoothly change following accelerator pedal operation
    2. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE). Refer to  PROBLEM SYMPTOMS TABLE [12/2023 - ] 

    Result: 

    NG 

    REPLACE ACCELERATOR PEDAL WITH SENSOR ROD ASSEMBLY. Refer to  REMOVAL [11/2020 - ] 

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