Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not using the hand-held tester.

Check output value of the steering angle sensor.
PREPARATION:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Select the DATALIST mode on the hand-held tester.
  CHECK:
  
  Check that the steering wheel turning angle value of the steering angle position sensor displayed on the hand-held tester is changing when turning the steering wheel.
  
  HINT:
  
  After certifying "Zero" point calibration of the steering angle sensor (Speed: 21 mph (35 km/h), driving straight ahead for 10 sec. or more), the value will change.
  
  OK:
  
  Steering wheel turning angle value must be changing.
1. OK: Go to step 5 .
2. NG: Go to next step.
Check input voltage of the steering angle sensor.
PREPARATION:

Remove the column lower cover.

CHECK:
1. Turn the ignition switch ON.
2. Measure voltage between terminals 1 and 2, 2 and 9 of the combination switch wire harness side connector.
  OK:
  
  Voltage: 10 to 14 V
  
  Fig 1: Identifying Steering Angle Sensor Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check and replace harness and connector.
2. OK: Go to next step.
Check steering angle sensor.
PREPARATION:
1. Remove the steering wheel lower No. 2 and No. 3 covers, steering wheel pad, steering wheel column upper and lower covers (See REMOVAL ).
2. Disconnect the combination switch connector (for steering angle sensor).
3. Connect the oscilloscope to terminals 3 and 6 of the combination switch connector (for steering angle sensor).
4. Apply battery positive voltage between terminals 1 and 2.
  CHECK:
  
  Turn the steering wheel slowly and check the signal waveform.
  
  OK:
  
  HINT:
  
  The above signal waveform does not repeat ON and OFF regularly and this combination changes case by case according to the data.
  
  Fig 2: Connecting Oscilloscope To Terminals 3 & 6 Of Combination Switch Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Signal Waveform Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace steering angle sensor.
2. OK: Go to next step.
Check that slits of the steering sensor disc are clogged up.
1. NG: Repair or replace steering sensor disc.
2. OK: Go to next step.
Check for open and short circuit in harness and connector between steering position sensor and ABS & BA & TRAC & VSC ECU (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Check and replace ABS & BA & TRAC & VSC ECU.