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Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Vehicle Stability Control System >> DTC C1231/31 Steering Angle Sensor Circuit Malfunction; DTC C1335/35 Steering Angle Sensor Circuit >> Inspection Procedure
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Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER (STEERING ANGLE SENSOR) 
    1. Check the DATA LIST for proper functioning of the steering angle sensor.

      Skid control ECU: 

      DIAGNOSTIC NOTE CHART

      Item Measurement Item / Range (Display) Normal Condition Diagnostic Note
      STEERING ANG Steering sensor / Min.: -1152 deg, Max.: 1150.875 deg Left turn: increase
      Right turn: decrease      		 -

      OK: Steering wheel turning angle value must be changing. 

    NG: Go to step  3

    OK: Go to Next Step 

  2. CHECK SKID CONTROL ECU (+BI VOLTAGE) 
    Fig 1: Checking Skid Control ECU (+BI Voltage)
    G05290637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the skid control ECU but do not disconnect the connectors.
    2. Turn the ignition switch ON.
    3. Measure the voltage of the connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S7-1T (+BI) - S5-16 (GND4) 10 to 14 V
      S7-17 (+BI) - S5-22 (GND3) 10 to 14 V
      S7-17 (+BI) - S8-6 (GND2) 10 to 14 V
      S7-17 (+BI) - S8-31 (GND1) 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (STEERING SENSOR - BATTERY) 
    1. Disconnect the S9 sensor connector.
      Fig 2: Identifying S9 Sensor Connector Terminals
      G05290638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S9-1 (IG1) - S9-2 (ESS) Ignition switch ON 10 to 14 V
      S9-3 (BAT) - S9-2 (ESS) Always 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to Next Step 

  4. INSPECT STEERING SENSOR 
    Fig 3: Identifying Blinking Pattern
    G05290639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the steering wheel and column lower cover (see REMOVAL ).
    2. Disconnect the steering sensor connector.
    3. Apply battery voltage between terminals 1 (IG1) and 2 (ESS), and 2 (ESS) and 3 (BAT).
    4. Connect an oscilloscope to terminals 9 (SSI-) and 10 (SSI+) of the steering sensor.
    5. Turn the steering column shaft slowly and check the signal waveform.

      OK: Waveform is output as shown above in illustration. 

      HINT:

      The above signal waveform does not repeat ON and OFF regularly and this ON to OFF interval changes depending on the steering column shaft movement.

    NG: REPLACE STEERING SENSOR 

    OK: REPLACE SKID CONTROL ECU 

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