VEHICLE STABILITY CONTROL SYSTEM(for Vacuum Brake Booster) FREEZE FRAME DATA


  1. FREEZE FRAME DATA


    1. Whenever a DTC is stored, the skid control ECU (brake actuator assembly) stores the current vehicle (sensor) state as freeze frame data.

    2. The skid control ECU (brake actuator assembly) stores the number of times (maximum: 31) the ignition switch has been turned from off to ON since the last time the ABS/VSC was activated.

      Tech Tips


      • If the vehicle is stopped or at a low speed (7 km/h (4 mph) or less), or if a DTC is stored, the skid control ECU (brake actuator assembly) stops counting the number of times the ignition switch has been turned from off to ON.

      • Freeze frame data at the time the ABS/VSC operates:

        The skid control ECU (brake actuator assembly) stores and updates data whenever the ABS/VSC operates.

        When the ECU stores data at the time a DTC is stored, the data stored during ABS/VSC operation is cleared.

      • Freeze frame data at the time a DTC is stored:

        When the skid control ECU (brake actuator assembly) stores data at the time a DTC is stored, no updates are performed until the data is cleared.

  2. CHECK FREEZE FRAME DATA


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.

    5. According to the display on the GTS, select the trouble code data display with freeze frame data.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Elapsed Time after Freeze Trigger Elapsed time after freeze trigger/ Min.: 0 msec, Max.: 510 msec - -
      Number of IG ON Number of times ignition switch turned to ON after storing freeze frame data/ 0 to 31 - -
      Stop Light SW Stop light switch/ ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -
      Parking Brake SW Parking brake switch/ ON or OFF

      ON: Parking brake applied

      OFF: Parking brake released

      		 -
      Gear Position Gear position information/ "P,N", R, 1st-10th, Fail or Not R Actual gear position -
      Shift Lever Position Shift lever position information/ "P,N", R, D/M, 1st-5th, 6th/B or Fail - The actual shift lever position.
      Operated System Operated system status/ ABS, VSC, TRC, BA, HAB, Fail, PBA, PB, HA-CTRL, TSC, SCB, Sys or Non -

      ABS: ABS is activated.

      VSC: VSC is activated.

      TRC: TRC is activated.

      BA: BA is activated.

      HAB:High power assist brake is activated

      Fail: Fail-safe mode is activated.

      PBA: PBA is activated.

      PB: PB is activated.

      HA-CTRL: Hill-start assist control is activated.

      TSC: Trailer sway control is activated*.

      SCB: Secondary collision brake is activated*.

      Sys: System prohibit is activated.

      Non: No operation is activated.

      Tech Tips

      *: System not equipped to vehicle
      Master Cylinder Sensor Master cylinder pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V When brake pedal released: 0.3 to 0.9 V The value increases when the brake pedal is depressed.
      M/C Sensor Grade Master cylinder pressure sensor change/ Min.: -30 MPa/s, Max.: 225 MPa/s When brake pedal released or pedal held at constant position: 0 MPa/s Changes in proportion to the pedal movement speed when the brake pedal is being operated.
      Yaw Rate Sensor Yaw rate sensor/ Min.: -128°/s, Max.: 127°/s

      Vehicle stopped: 0°/s

      Turning right: -128 to 0°/s

      Turning left: 0 to 127°/s

      		 -
      Lateral G

      Lateral G/ Min.: -25.10 m/s2, Max.: 24.90 m/s2

      		- Changes in proportion to acceleration during turning.
      Forward and Rearward G

      Forward and backward G/ Min.: -25.10 m/s2, Max.: 24.90 m/s2

      		- Changes in proportion to acceleration during acceleration/deceleration.
      FR Wheel Speed Front speed sensor RH value/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h No large fluctuations when driving at a constant speed.
      FL Wheel Speed Front speed sensor LH value/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h No large fluctuations when driving at a constant speed.
      RR Wheel Speed Rear speed sensor RH value/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h No large fluctuations when driving at a constant speed.
      RL Wheel Speed Rear speed sensor LH value/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h No large fluctuations when driving at a constant speed.
      Vehicle Speed Maximum wheel speed sensor value/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Actual vehicle speed The speed which is indicated on the speedometer.
      Vehicle Speed Grade

      Vehicle acceleration/ Min.: -25.10 m/s2, Max.: 24.90 m/s2

      Vehicle stopped: 0 m/s2

      		Changes in proportion to the vehicle acceleration/deceleration during driving.
      FR Wheel Direction Front wheel RH direction signal/ Forward or Back

      Forward: Forward

      Back: Backward

      		 -
      FL Wheel Direction Front wheel LH direction signal/ Forward or Back

      Forward: Forward

      Back: Backward

      		 -
      RR Wheel Direction Rear wheel RH direction signal/ Forward or Back

      Forward: Forward

      Back: Backward

      		 -
      RL Wheel Direction Rear wheel LH direction signal/ Forward or Back

      Forward: Forward

      Back: Backward

      		 -
      Real Engine Torque Actual engine torque/ Min.: -1024.0 Nm, Max.: 1023.0 Nm - -
      Accelerator Opening Angle % Throttle valve opening amount/ Min.: 0.0%, Max.: 127.5% When accelerator pedal released: 0% Changes in proportion to the movement of the pedal during accelerator pedal operation.
      IG1 Voltage Value IG1 voltage/ Min.: 0.00 V, Max.: 20.00 V Ignition switch ON: 11 to 14 V -
      Brake Pedal Load Sensing SW Brake pedal load sensing switch/ ON or OFF

      ON: Brake pedal depressed beyond specified point

      OFF: Brake pedal not depressed beyond specified point

      		 -
      Inspection Mode Inspection mode/ Other or Inspect

      Other: Normal mode

      Inspect: Inspection mode

      		 -
      Steering Angle Sensor Steering angle sensor/ Min.: -3276.8°, Max.: 3276.7°

      Left turn: Increase

      Right turn: Decrease

      		 -
      TRC/VSC Off Mode TRC/VSC off mode/ Normal, TRC OFF or VSC OFF

      Normal: Normal mode

      TRC OFF: TRC OFF mode

      VSC OFF: TRC, VSC OFF mode

      		 -

  3. CLEAR FREEZE FRAME DATA

    Note

    Clearing the DTC also clears the freeze frame data.


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs and freeze frame data Click here.