Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

When U0121/94, U0123/62, U0124/95 and/or U0126/63 are output together with C1231/31, inspect and repair the trouble areas indicated by U0121/94, U0123/62, U0124/95 or U0126/63 first.
When the speed sensor or the yaw rate sensor has trouble, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor are output together with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate sensor first, and then inspect and repair the steering angle sensor.
Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using hand-held tester.

READ VALUE OF HAND-HELD TESTER (STEERING ANGLE SENSOR)
1. Connect the hand-held tester to the DLC3.
2. Start the engine.
3. Select the DATA LIST mode on the hand-held tester.
  
  Fig 1: Steering Angle Sensor Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check that the steering angle sensor value of the steering angle sensor observed in the hand-held tester changes when the steering wheel is moved.
Standard:
1. Steering angle value should change.
NOTE: When replacing the Brake Actuator assy, perform zero point calibration (see PRE-CHECK ).

NG: Go to step 2

OK: REPLACE BRAKE ACTUATOR ASSY
CHECK TERMINAL VOLTAGE (STEERING ANGLE SENSOR CONNECTOR)
1. Remove the steering wheel and the column lower cover.
2. Disconnect the steering angle sensor connector S9.
  
  Fig 2: Disconnecting Steering Angle Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the ignition switch to the ON position.
4. Measure the voltage according to the value(s) in Fig 3 .
  Standard
  
  Fig 3: Measuring Voltage Between IG & ESS Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Measure the voltage according to the value(s) in Fig 4 .
  Standard
  
  Fig 4: Measuring Voltage Between BAT & ESS Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE STEERING ANGLE SENSOR