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Drive Start Control [10/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus LS 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. PAST ACTIVATION CONFIRMATION 
    1. Check if the customer operated the vehicle in a way that would cause the drive start control to operate.

      HINT: 

      The operating conditions for drive start control include sudden start restraint control and reverse speed control.

      1. Sudden start restraint control

        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 lever is moved from P to any forward position D (Including other forward shift positions) or 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 lever is moved from R to any forward position D (Including other forward shift positions), any forward position D (Including other forward shift positions) to R, or N to R.

            HINT: 

            Operation may not be possible in certain situations.

            GTY905864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Items Controlled
          • Hybrid system output is restricted.
        • Deactivation Conditions
          • The accelerator pedal is released.
          • The shift state is in park (P) or neutral (N).
      2. Reverse speed control

        Activation conditions 

        • When reverse speed control is turned ON. (When all of the following conditions are met, control starts.)
          • The shift state is in reverse (R).
          • The accelerator pedal is depressed excessively.
            GTY915842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Items Controlled
          • Hybrid system output is restricted.
        • Deactivation Conditions
          • The accelerator pedal is released.
          • The shift lever is moved to any shift state other than reverse (R).

      HINT: 

      • The restraint level for hybrid system output differs between the sudden start restraint controls (Pattern A and Pattern B) and the reverse speed control (reverse speed control ON).
      • During reverse speed control and sudden start restraint control, hybrid system output is adjusted based on the road gradient.
      • Sudden start restraint control is not active when TRC is turned off.

        Control will also not operate under the following conditions. (if equippe

        • When TRAIL mode is on
        • When multi-terrain select is selected
      • The reverse speed control can be temporarily set to OFF via vehicle settings.

      Result

      Result Proceed to
      Not performed A
      Performed B

    Result: 

    B 

    SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE). Refer to  PROBLEM SYMPTOMS TABLE [10/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Check the DTCs.
    2. Turn the ignition switch off.

      Result

      Result Proceed to
      DTCs are not output (Hunting) A
      DTCs are not output (Hesitation/poor acceleration) B
      DTCs are output C

    Result: 

    B 

    See step  6

    Result: 

    C 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ] 

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (FR, FL, RR, RL WHEEL SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Brake/EPB / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

      Chassis > Brake/EPB > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed
    5. Read the value displayed on the Techstream.

      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.

    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSPECT FRONT OR REAR SPEED SENSOR 

    w/ Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    w/o Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (VEHICLE SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Vehicle Speed.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Vehicle Speed
    5. Read the value of "Vehicle Speed" displayed on the Techstream.

      HINT: 

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

      Powertrain > Hybrid Control > 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.

    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSPECT ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 

    w/ Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    w/o Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    Result: 

    OK 

    See step  5

  5. READ VALUE USING TECHSTREAM (LATERAL G, FORWARD AND REARWARD G) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Brake/EPB / Data List / Lateral G and Forward and Rearward G.

      Chassis > Brake/EPB > Data List 

      Tester Display
      Lateral G
      Forward and Rearward G
    5. Read the value displayed on the Techstream.

      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
      Lateral G Lateral G Min.: -25.105 m/s2
      Max.: 24.908 m/s2      		 Turning right: -25.105 to 0.000 m/s2
      Turning left: 0.000 to 24.908 m/s2
      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.

    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE). Refer to  PROBLEM SYMPTOMS TABLE [10/2023 - ] 

    Result: 

    NG 

    INSPECT YAW RATE SENSOR 

    w/ Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

  6. READ VALUE USING TECHSTREAM (SHIFT POSITION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Shift Position.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Shift Position
    5. Read the value displayed on the Techstream.

      Powertrain > Hybrid Control > 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 (M)

      OK

      Condition Specified Condition
      Select shift state Matches currently selected shift state
    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO ELECTRONIC SHIFT LEVER SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    OK 

    See step  7

  7. READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE %, ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE %) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Accelerator Position Sensor No. 1 Voltage %, Accelerator Position Sensor No. 2 Voltage %.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Accelerator Position Sensor No. 1 Voltage %
      Accelerator Position Sensor No. 2 Voltage %
    5. Read the value displayed on the Techstream.

      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 > Hybrid Control > 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
    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE). Refer to  PROBLEM SYMPTOMS TABLE [10/2023 - ] 

    Result: 

    NG 

    REPLACE ACCELERATOR PEDAL (W/SENSOR) ROD ASSEMBLY. Refer to  REMOVAL [10/2017 - ] 

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