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Home >> Lexus >> 2023 >> LS 500h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (W/O Advanced Park) - Diagnostic Codes (10 Of 10) & Circuit Tests (1 Of 2) >> HYBRID CONTROL SYSTEM (w/o Advanced Park) >> Drive Start Control [10/2017 - 10/2023] >> Procedure

Drive Start Control [10/2017 - 10/2023]: 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  8

    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 (M)) 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 (M)), any forward shift state (drive (D) or manual (M)) to reverse (R), or neutral (N) to reverse (R).
          GTY802044Courtesy 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
        • Driving force 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.
        GTY816363Courtesy 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 [10/2017 - 10/2023] 

    Result: 

    A 

    See step  3

  3. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: System Select / Health Check.
    5. Check the DTCs.
    6. Turn the power switch off.

      Result

      Proceed to
      DTCs are not output
      DTC is output

    Result: 

    DTC is output 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2018]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 09/2019]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2019 - 10/2020]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2020 - 10/2023] 

    Result: 

    DTCs are not output 

    See step  4

  4. 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 / ABS/VSC/TRC / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

      Chassis > ABS/VSC/TRAC > 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 > ABS/VSC/TRAC > 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

      Techstream Display Condition Specified Condition
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed      		 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. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023] 

    Result: 

    OK 

    See step  5

  5. 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). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023] 

    Result: 

    OK 

    See step  6

  6. READ VALUE USING TECHSTREAM (DECELERATION SENSOR) 
    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 / ABS/VSC/TRC / Data List / Deceleration Sensor and Deceleration Sensor2.

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Deceleration Sensor
      Deceleration Sensor2
    5. Read the value displayed on the Techstream.

      HINT: 

      If the Data List updates slowly, perform measurement after selecting only the " Deceleration Sensor" and " Deceleration Sensor2" items.

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition
      Deceleration Sensor Acceleration sensor 1 Min.: -18.525 m/s2 , Max.: 18.387 m/s2 During deceleration/acceleration: Changes continuously
      Deceleration Sensor2 Acceleration sensor 2 Min.: -18.525 m/s2 , Max.: 18.387 m/s2 During deceleration/acceleration: Changes continuously

      Standard

      Techstream Display Condition Specified Condition
      Deceleration Sensor
      Deceleration Sensor2      		 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: 

    NG 

    INSPECT YAW RATE SENSOR. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023] 

    Result: 

    OK 

    See step  7

  7. READ VALUE USING TECHSTREAM (STEERING ANGLE SENSOR) 
    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 / ABS/VSC/TRC / Data List / Steering Angle Sensor.

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Steering Angle Sensor
    5. Read the value displayed on the Techstream.

      HINT: 

      If the Data List updates slowly, perform measurement after selecting only the "Steering Angle Sensor" item.

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition
      Steering Angle Sensor Steering angle sensor Min.: -3276.8 degrees, Max.: 3276.7 degrees Turning left: Increases
      Turning right: Decreases

      Standard

      Condition Specified Condition
      Steering wheel turned left Value increases with steering wheel operation
      Steering wheel turned right Value decreases with steering wheel operation
      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 [10/2017 - 10/2023] 

    Result: 

    NG 

    INSPECT STEERING ANGLE SENSOR. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023] 

  8. 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 (M)) 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 (M)), any forward shift state (drive (D) or manual (M)) to reverse (R), or neutral (N) to reverse (R).
          GTY833153Courtesy 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
        • Driving force 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.
        GTY816362Courtesy 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
      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  9

  9. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: System Select / Health Check.
    5. Check the DTCs.

      Result

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

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2018]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 09/2019]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2019 - 10/2020]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2020 - 10/2023] 

    Result: 

    A 

    See step  10

  10. 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 

    for 2WD:

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]

    for AWD:

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]

    Result: 

    OK 

    See step  11

  11. 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 [10/2017 - 10/2023] 

    Result: 

    NG 

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

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