- Clear zero point calibration data.
- Perform yaw rate and acceleration sensor zero point calibration.
Lexus NX: Calibration
CALIBRATION
DESCRIPTION
(a) After replacing any VSC related components or performing wheel alignment adjustment, clear and read the sensor calibration data.
Refer to the table below and then perform the necessary operation according to the part to be replaced in order to perform calibration.
| Part to be Replaced / Operation | Necessary Operation |
|---|---|
| Skid control ECU (Brake booster with master cylinder assembly) | Perform yaw rate and acceleration sensor zero point calibration. |
| Yaw rate and acceleration sensor (Airbag ECU assembly) | |
| Wheel alignment adjustment |
|
OBTAIN ZERO POINT OF YAW RATE AND ACCELERATION SENSOR
NOTICE:
- While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it.
- Be sure to perform this procedure on a level surface (with an inclination of less than 1 degree).
(a) Clear the zero point calibration data.
(1) Turn the power 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 power switch on (IG).
(6) Turn the Techstream on.
(7) Select the skid control ECU (brake booster with master cylinder assembly) to clear the zero point calibration data using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Reset Memory.
Chassis > ABS/VSC/TRAC > Utility| Tester Display |
|---|
| Reset Memory |
(8) Turn the power switch off.
NOTICE:
If the power switch is turned on (IG) for more than 15 seconds with the shift lever in P after the 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 (brake booster with master cylinder assembly) will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU (brake booster with master cylinder assembly) will then also indicate this as a malfunction of the VSC system using the indicator light.
(b) Perform zero point calibration of the yaw rate and acceleration sensor.
(1) Turn the power switch off.
(2) Check that the steering wheel is centered.
(3) Check that the shift lever is in P.
NOTICE:
DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor undone) and C1336 (Zero Point Calibration of Acceleration Sensor undone) will be stored if the shift lever is not in P.
(4) Connect the Techstream to the DLC3.
(5) Turn the power switch on (IG).
(6) Turn the Techstream on.
(7) Switch the skid control ECU (brake booster with master cylinder assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Test Mode.
Chassis > ABS/VSC/TRAC > Utility| Tester Display |
|---|
| Test Mode |
(8) After Test Mode has been entered, keep the vehicle stationary on a level surface for 3 seconds or more.
(9) Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
HINT:
- If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, perform zero point calibration again.
- 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 power switch off and disconnect the Techstream.
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