Inspection Procedure

HINT:

Start the inspection from step  1 in case of using the hand-held tester and start from step  2 in case of no using the hand-held tester.

1. READ VALUE OF YAWRATE SENSOR(INCLUDE DECELERATION SENSOR) 
   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 DATA LIST mode on the hand-held tester.
   4. Check that the deceleration value of the deceleration sensor displayed on the hand-held tester is changing when tilting the vehicle.

      OK: 

      Deceleration value must be changing. 

   OK : CHECK AND REPLACE SKID CONTROL ECU ASSY 

   NG : Go to Next Step 

2. INSPECT YAWRATE SENSOR (INCLUDE DECELERATION SENSOR) 
   1. Remove the console box and yaw rate sensor.
   2. Connect 3 dry batteries of 1.5 V in series.
   3. Connect VYS terminal to the batteries' positive (+) terminal and GYAW terminal to the batteries' negative (-) terminal. Apply about 4.5 V between VYS and GYAW terminals.
      NOTE: Do not apply voltage of 6 V or more to terminals VYS and GYAW.
   4. Check the output voltage of GL1 and GL2 terminals when the sensor is tilted forward and rearward.

      OK: 

      PROBLEM SYMPTOMS
      
      

      Symbols	Condition	Standard Value
      GL1	Horizontal	About 2.3 V
      GL1	Lean forward	0.4-about 2.3 V
      GL1	Lean rearward	About 2.3 V-4.1V
      GL2	Horizontal	About 2.3 V
      GL2	Lean forward	About 2.3 V-4.1 V
      GL2	Lean rearward	0.4-about 2.3 V

      Fig 1: Inspecting Yawrate Sensor (Include Deceleration Sensor)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • If the sensor is tilted too much it may show the wrong value.
      • If dropped, the sensor should be replaced with a new one.
      • The sensor removed from the vehicle should not be placed upside down.

   NG : REPLACE YAWRATE SENSOR 

   OK : 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 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