Inspection Procedure

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

1. READ DATA LIST (STEERING ANGLE SENSOR)*1 
   1. Check the DATA LIST for proper functioning of the steering angle sensor.

      Skid control ECU assembly: 

      DATA LIST
      
      

      Item	Measurement Item / Range (Display)	Normal Condition	Diagnostic Note
      STEERING ANG	Steering sensor / Min.: -1682 deg, Max.: 1877 deg	-1682 to 1877 deg	Turning the steering wheel changes the value Left: Becomes greater Right: Becomes smaller

      OK: Steering wheel turning angle value must be changing. 

   OK: Go to step  5

   NG: Go to Next step 

2. CHECK WIRE HARNESS (STEERING SENSOR - BATTERY)*2 
   1. Remove the column lower cover.
   2. Turn the ignition switch ON.
   3. Measure voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      C36-1 (IG) - C36-2 (ESS)	Ignition switch ON	10 to 14 V

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   Fig 1: Identifying Steering Angle Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next step 

3. INSPECT STEERING ANGLE SENSOR 
   Fig 2: Identifying C36 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the No. 2 and No. 3 steering wheel lower covers, steering wheel pad, and steering wheel column upper and lower covers.
   2. Disconnect the combination switch connector (for steering angle sensor).
   3. Connect an oscilloscope to terminals 3 and 4 of the combination switch connector (for steering angle sensor).
   4. Apply battery positive voltage between terminals 1 and 2.
   5. Turn the steering wheel slowly and check the signal waveform.

      OK: A waveform is output, as shown in the illustration. 

      HINT:

      The above signal waveform does not repeat ON and OFF regularly, and this interval changes according to the data.

   NG: REPLACE STEERING ANGLE SENSOR 

   OK: Go to Next step 

4. CHECK STEERING SENSOR DISC 
   1. Check steering sensor disc.

   NG: REPLACE STEERING SENSOR DISC 

   OK: Go to Next step 

5. CHECK WIRE HARNESS (STEERING SENSOR - SKID CONTROL ECU ASSEMBLY) 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY