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Vehicle Stability Control System: Calibration

  1. DESCRIPTION 
    • After replacing the VSC relevant components or performing "Front wheel alignment adjustment", clear and read the sensor calibration data.
    • Follow the chart to perform calibration.
      CALIBRATION CHART

      Replacing Parts / Operation Necessary Operation
      Skid control ECU Yaw rate and acceleration sensor zero point calibration.
      Yaw rate and acceleration sensor
      1. Clearing zero point calibration data.
      2. Yaw rate and acceleration sensor zero point calibration.
      Front wheel alignment adjustment
      1. Clearing zero point calibration data.
      2. Yaw rate and acceleration sensor zero point calibration.
  2. OBTAIN ZERO POINT OF YAW RATE AND ACCELERATION SENSOR (INTELLIGENT TESTER) 
    NOTE:
    • While obtaining the zero point, 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.
      1. Turn the engine switch off.
      2. Connect the intelligent tester to the DLC3.
      3. Check that the steering wheel is centered and move the shift lever to the P position.
      4. Turn the engine switch on (IG).
        Fig 1: Connecting Intelligent Tester To DLC3
        G05250268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Operate the intelligent tester to erase the codes (select "RESET MEMORY").

        HINT:

        Refer to the intelligent tester operator's manual for further details.

        Fig 2: Intelligent Tester Display - Reset Memory
        G04977986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Turn the engine switch off.
        NOTE: If the engine switch is turned on (IG) for more than 15 seconds with the shift lever in the P position after zero point of the yaw rate and acceleration sensor has 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 multi information display.
    2. Perform zero point calibration of the yaw rate and acceleration sensor.
      1. Turn the engine switch off.
      2. Check that the steering wheel is centered and move the shift lever to the P position.
        NOTE: DTCs C1210/36 and C1336/39 will be recorded if the shift lever is not in the P position (See DTC C1210/36 ZERO POINT CALIBRATION OF YAW RATE SENSOR UNDONE; DTC C1336/39 ZERO POINT CALIBRATION OF ACCELERATION SENSOR UNDONE  ).
      3. Connect the intelligent tester to the DLC3.
      4. Turn the engine switch on (IG).
        Fig 3: Connecting Intelligent Tester To DLC3
        G05250268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Set the intelligent tester to Test Mode (select "TEST MODE").

        HINT:

        Refer to the intelligent tester operator's manual for further details.

        Fig 4: Intelligent Tester Display - Test Mode
        G04977988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. After the Test Mode has been entered, keep the vehicle stationary on a level surface for 2 seconds or more.
      7. Check that the "VSC TEST MODE" is displayed on the multi information display (Test Mode).

        HINT:

        • The SLIP indicator light remains on during Test Mode because TRAC is prohibited.
        • If the "VSC TEST MODE" is not displayed on the multi information display, perform zero point calibration again.
        • The zero point calibration is performed only once after the system enters the Test Mode.
        • Calibration cannot be performed again until the stored data is cleared.
          Fig 5: Display In VSC TEST MODE
          G05250349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      8. Turn the engine switch off and disconnect the intelligent tester.
  3. OBTAIN ZERO POINT OF YAW RATE AND ACCELERATION SENSOR (SST CHECK WIRE) 
    NOTE:
    • While obtaining the zero point, 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.
      1. Turn the engine switch off.
      2. Check that the steering wheel is centered and move the shift lever to the P position.
      3. Turn the engine switch on (IG).
      4. The warning light and indicator light come on for 3 seconds to indicate that the initial check is completed.
        Fig 6: Identifying DLC3 Connector Terminals
        G04977895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds.

        SST 09843-18040 

      6. Check that the "CHECK VSC" is displayed on the multi information display.
        NOTE: If the engine switch is turned on (IG) for more than 15 seconds with the shift lever in the P position after zero point of the yaw rate and acceleration sensor has 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 multi information display.
        Fig 7: Display In Normal System Code
        G05250351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Perform zero point calibration of the yaw rate and acceleration sensor.
      1. Turn the engine switch off.
      2. Check that the steering wheel is centered and move the shift lever to the P position.
        NOTE: DTCs C1210/36 and C1336/39 will be recorded if the shift lever is not in the P position (See DTC C1210/36 ZERO POINT CALIBRATION OF YAW RATE SENSOR UNDONE; DTC C1336/39 ZERO POINT CALIBRATION OF ACCELERATION SENSOR UNDONE  ).
      3. Using SST, connect terminals TS and CG of the DLC3.

        SST 09843-18040 

        Fig 8: Identifying DLC3 Connector Terminals
        G04977895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the engine switch on (IG).
      5. Keep the vehicle stationary on a level surface for 2 seconds or more.
      6. Check that the "VSC TEST MODE" is displayed on the multi information display (Test Mode).

        HINT:

        • The SLIP indicator light remains on during Test Mode because TRAC is prohibited.
        • If the "VSC TEST MODE" is not displayed on the multi information display, perform zero point calibration again.
        • The zero point calibration is performed only once after the system enters the Test Mode.
        • Calibration cannot be performed again until the stored data is cleared.
        Fig 9: Display In VSC TEST MODE
        G05250349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Turn the engine switch off and disconnect the SST from the DLC3.
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