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Home >> Lexus >> 2004 >> GX 470 >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1233/33, C1234/34: Yaw Rate Sensor Circuit; Malfunction In Yaw Rate Sensor >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF YAWRATE SENSOR 

    IN CASE OF USING HAND-HELD TESTER: 

    1. Remove the console box.
    2. Remove the yaw rate sensor with the connector still connected to it.
    3. Connect the hand-held tester to the DLC3.
    4. Turn the ignition switch ON and push the hand-held tester main switch ON.
    5. Select the DATA LIST mode on the hand-held tester.
    6. Check that the yaw rate sensor value of the yaw rate sensor observed in the hand-held tester is changing: Place the yaw rate sensor vertically to the ground and turn the sensor pivoted on its center.
      Fig 1: Identifying Yaw Rate Sensor With Connector
      G04354798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

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

    IN CASE OF NOT USING 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 YAW2 (1) -GYAW (5), and terminals YD (6)-GYAW (5) of the yaw rate sensor.

      OK: 

      VOLTAGE TABLE

      Terminals 1 and 5 (YAW2-GYAW) About 2.42--2.58 V
      Terminals 6 and 5 (YD-GYAW) About 4.5--5.3 V
      Fig 2: Measuring Voltage Between Terminals YAW2 (1)-GYAW (5) & Terminals YD (6)-GYAW (5) Of Yaw Rate Sensor
      G04354799Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE YAWRATE SENSOR 

    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 and GND of skid control ECU.

      OK: 

      Voltage: 4.5 - 5.3 V 

      Fig 3: Inspecting Skid Control ECU Terminal Voltage (YD Terminal)
      G04354800Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : CHECK AND REPLACE SKID CONTROL ECU ASSY 

    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 (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : CHECK AND REPLACE SKID CONTROL ECU ASSY 

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