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Vehicle Stability Control System: Calibration

  1. DESCRIPTION 
    • After replacing any VSC related components or performing a front wheel alignment adjustment, clear and read the sensor calibration data and system information
    • Follow the chart below to perform calibration
      Fig 1: Jiggling Connectors Or Wire Harnesses Between ECU And Sensors, Or Between ECU
      G04832151Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      CALIBRATION CHART

      Parts to be Replaced / Operation Necessary Operation
      Skid control ECU Yaw rate and acceleration sensor zero point calibration and store system information
      Yaw rate and acceleration sensor
      1. Clearing zero point calibration data and system information
      2. Yaw rate and acceleration sensor zero point calibration and store system information
      Front wheel alignment adjustment
      1. Clearing zero point calibration data and system information
      2. Yaw rate and acceleration sensor zero point calibration and store system information
  2. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION (When Using the Techstream) 
    NOTE:
    • Stored system information can not be overwritten unless it is cleared. Clear the stored information and then store new system information.
    • While obtaining the zero points, keep the vehicle stationary and do not vibrate, tilt, move, or shake it. (Do not start the engine.)
    • Be sure to perform this procedure on a level surface (with an inclination of less than 1 degree).
    1. Clear the zero point calibration data and system information
      NOTE: Performing the following procedure will clear the zero points of the yaw rate and acceleration sensor and system information simultaneously.
      1. Turn the engine switch off
      2. Check that the steering wheel is centered
      3. Check that the shift lever is in P
      4. Connect the Techstream to the DLC3
      5. Turn the engine switch on (IG)
      6. Turn the Techstream on
      7. Select the skid control ECU to clear the zero point calibration data using the Techstream Enter the following menus Chassis / ABS/VSC/ TRAC / Utility / Reset Memory
      8. Turn the engine switch off.
        NOTE:
        • If the vehicle is driven after the zero point of the yaw rate and acceleration sensor and system information are cleared, DTCs will be stored.
        • If the engine switch is turned on (IG) for more than 15 seconds with the shift lever in P after the zero points of the yaw rate and acceleration sensor have been cleared, only the zero point of the yaw rate sensor will be stored. If the vehicle is driven under these conditions, the skid control ECU will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU will then also indicate this as a malfunction of the VSC system using the indicator lights and the multi-information display.
    2. Perform the yaw rate and acceleration sensor zero point calibration and store system information
      NOTE: Performing the following procedure will perform the yaw rate and acceleration sensor zero point calibration and store system information simultaneously.
      1. Turn the engine switch off
      2. Check that the steering wheel is centered
      3. Check that the shift lever is in P
        NOTE:
        • DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor Undone) and C1336 (Zero Point Calibration of Acceleration Sensor Undone) will be recorded if the shift lever is not in P.
        • If a DTC is stored that indicates zero point calibration is incomplete, repeat the procedure starting at the step for clearing the zero point calibration data and system information.
      4. Connect the Techstream to the DLC3
      5. Turn the engine switch on (IG)
      6. Turn the Techstream on.
      7. Switch the skid control ECU to Test Mode using the Techstream Enter the following menus. Chassis / ABS/VSC/TRAC / Utility / Test Mode
      8. After Test Mode has been entered, keep the vehicle stationary on a level surface for 2 seconds or more.
      9. Check that the master caution indicator light comes on for several seconds and then blinks in Test Mode and the VSC test mode message is displayed on the multi-information display
        Fig 2: Identifying Test Mode Blinking Pattern
        G05751368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT

        • If the master caution indicator light does not blink and/or the VSC test mode message is not displayed on the multi-information display, perform zero point calibration again
        • Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings
        • The zero point calibration is performed only once after the system enters Test Mode
        • Calibration cannot be performed again until the stored data is cleared
      10. Turn the engine switch off and disconnect the Techstream
  3. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION (When not Using the Techstream) 
    NOTE:
    • Stored system information can not be overwritten unless it is cleared. Clear the stored information and then store new system information.
    • While obtaining the zero points, keep the vehicle stationary and do not vibrate, tilt, move, or shake it. (Do not start the engine.)
    • Be sure to perform this procedure on a level surface (with an inclination of less than 1 degree).
    1. Clear the zero point calibration data and system information.
      NOTE: Performing the following procedure will clear the zero points of the yaw rate and acceleration sensor and system information simultaneously.
      1. Turn the engine switch off
      2. Check that the steering wheel is centered
      3. Check that the shift lever is in P.
      4. Turn the engine switch on (IG)
      5. The warning light and indicator light come on for 3 seconds to indicate that the initial check is completed
      6. Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds

        SST 09843-18040 

        Fig 3: Identifying Terminals TS And CG Of DLC3
        G05412997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Check that the multi-information display indicates the normal system code.
        NOTE:
        • If the vehicle is driven after the zero point of the yaw rate and acceleration sensor and system information are cleared, DTCs will be stored.
        • If the engine switch is turned on (IG) for more than 15 seconds with the shift lever in P after the zero points of the yaw rate and acceleration sensor have been cleared, only the zero point of the yaw rate sensor will be stored. If the vehicle is driven under these conditions, the skid control ECU will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU will then also indicate this as a malfunction of the VSC system using the indicator lights and the multi-information display.
    2. Perform the yaw rate and acceleration sensor zero point calibration and store system information
      NOTE: Performing the following procedure will perform the yaw rate and acceleration sensor zero point calibration, and also store system information simultaneously.
      1. Turn the engine switch off
      2. Check that the steering wheel is centered.
      3. Check that the shift lever is in P
        NOTE:
        • DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor Undone) and C1336 (Zero Point Calibration of Acceleration Sensor Undone) will be recorded if the shift lever is not in P.
        • If a DTC is stored that indicates zero point calibration is incomplete, repeat the procedure starting at the step for clearing the zero point calibration data and system information.
      4. Using SST, connect terminals TS and CG of the DLC3

        SST 09843-18040 

        Fig 4: Identifying Terminals TS And CG Of DLC3
        G05412997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Turn the engine switch on (IG)
      6. After Test Mode has been entered, keep the vehicle stationary on a level surface for 2 seconds or more.
      7. Check that the master caution indicator light comes on for several seconds and then blinks in Test Mode and the VSC test mode message is displayed on the multi-information display.
        Fig 5: Identifying Test Mode Blinking Pattern
        G05751368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT

        • If the master caution indicator light does not blink and/or the VSC test mode message is not displayed on the multi-information display, perform zero point calibration again.
        • Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings.
        • The zero point calibration is performed only once after the system enters Test Mode
        • Calibration cannot be performed again until the stored data is cleared.
      8. Turn the engine switch off and disconnect SST from the DLC3.
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