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Home >> Lexus >> 2002 >> SC 430 >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1233/33: Yaw Rate Sensor Circuit, DTC C1234/34: Malfunction In Yaw Rate Sensor >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF YAW RATE SENSOR 

    IN CASE OF USING LEXUS HAND-HELD TESTER: 

    1. Remove the console box.
    2. Remove the yaw rate sensor with the connector still connected to it.
    3. Connect the LEXUS hand held tester to the DLC3.
    4. Turn the ignition switch ON and push the LEXUS handheld tester main switch ON.
    5. Select the DATALIST mode on the LEXUS hand held tester.
    6. Check that the yaw rate sensor value of the yaw rate sensor observed in the LEXUS hand held tester is changing: Place the yaw rate sensor vertically to the ground and turn the sensor pivoted on its center.

      OK: 

      Yaw rate value must be changing. (Reference) When the yaw rate sensor is stationary output value: +/- 4deg/s. 

      Fig 1: Identifying Yaw Rate Sensor
      G03386369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    IN CASE OF NOT USING LEXUS HAND-HELD TESTER: 

    1. Remove the console box then remove the yaw rate sensor with the connector still connected to it.
    2. Turn the ignition switch ON.
    3. Measure voltage between terminals YAW (1) -GYAW (5), and terminals YD (6)-GYAW (5) of the yaw rate sensor.

      OK: 

      YAW RATE SENSOR TERMINAL VOLTAGE SPECIFICATIONS

      Terminals 1 and 5 (YAW-GYAW) About 2.42-2.58 V
      Terminals 6 and 5 (YD-GYAW) About 4.5-5.3 V
      Fig 2: Measuring Voltage Between Yaw Rate Sensor Terminals
      G03386370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE YAW RATE SENSOR 
    2. OK: Go to next step. 
  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (YD TERMINAL) 
    1. Remove the skid control ECU with the connector still connected.
    2. Turn the ignition switch ON.
    3. Measure voltage between terminals YD (S6 - 19) and GND (S5 - 16, 22, S8 - 6, 31) of skid control ECU.

      OK: 

      Voltage: 4.5 - 5.3 V 

      Fig 3: Measuring Voltage Between Skid Control ECU Terminals
      G03386371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: CHECK AND REPLACE SKID CONTROL ECU ASSY 
    2. NG: Go to next step. 
  3. CHECK HARNESS AND CONNECTOR (YAW RATE SENSOR - SKID CONTROL ECU) 
    1. Check for open and short circuit in harness and connector between terminal YD of yaw rate sensor and skid control ECU.
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE SKID CONTROL ECU ASSY 
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