Vehicle Stability Control System: Calibration

1. After replacing the VSC relevant components or performing "Front wheel alignment adjustment", clearing and reading the sensor calibration data is necessary.
2. Follow the chart to perform calibration.
   CALIBRATION CHART
   
   

   Replacing Parts	Necessary Operation
   Skid Control ECU	Yaw rate sensor and deceleration sensor zero point calibration
   Yaw Rate Sensor	Clearing zero point calibration data Yaw rate sensor and deceleration sensor zero point calibration
   Front Wheel Alignment	Clearing zero point calibration data Yaw rate sensor and deceleration sensor zero point calibration

HINT:

After replacing the yaw rate sensor and deceleration sensor, make sure to clear zero point calibration data in the skid control ECU and perform zero point calibration.

1. Clear the zero point calibration data using the SST check wire.
   1. Turn the ignition switch ON.
   2. Using SST, connect and disconnect terminals 12 (TS) and 4 (CG) of the DLC3 4 times or more within 8 seconds.

      SST 09846-18040 

   3. Check that the warning light indicates the normal code.
   4. Remove SST.
      Fig 1: Identifying DLC3 Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

After replacing the brake master cylinder, make sure to perform yaw rate sensor and deceleration sensor zero point calibration.

1. Move the shift lever to P.
2. Clear the zero point calibration data.
3. Procedures for test mode:
   1. Turn the ignition switch OFF.
   2. Apply the parking brake (parking brake switch ON).
   3. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST 09843-18040 

   4. Check that the steering wheel is in the straight-ahead position and move the shift lever to P.
   5. Turn the ignition switch ON.
4. Keep the vehicle in the stationary condition on a level surface for 2 seconds or more.
5. Check that the VSC OFF indicator light blinks.

   HINT:

   • If the VSC OFF indicator light does not blink, perform the 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 once.
     Fig 2: Identifying DLC3 Connector Terminals

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Clear the zero point calibration data.
   1. Connect the intelligent tester (with CAN VIM) to the DLC3.
   2. Turn the ignition switch ON.
   3. Operate the intelligent tester (with CAN VIM) to clear the zero point calibration data.

      HINT:

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

(When Using Intelligent Tester) 

1. Check that the steering wheel is in the straight ahead position and move the shift lever to P.
2. Connect the intelligent tester (with CAN VIM) to the DLC3.
3. Turn the ignition switch ON.
4. Change the intelligent tester to test mode.
5. Obtain the zero point of the yaw rate sensor and deceleration sensor:
   1. Keep the vehicle in a stationary condition on a level surface for 2 seconds or more.
   2. Check that the VSC OFF indicator light blinks.

      HINT:

      • If the VSC OFF indicator light does not blink, perform the 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 once.
6. Turn the ignition switch OFF.
   Fig 4: Connecting Intelligent Tester To DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002