Inspection Procedure

HINT:

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

1. READ VALUE OF INTELLIGENT TESTER (DECELERATION SENSOR)*1 
   1. Check the DATA LIST for proper functioning of the deceleration sensor.

      Skid control ECU assembly 

      DATA LIST
      
      

      Item	Measurement Item / Range (Display)	Normal Condition	Diagnostic Note
      DECELERAT SENS	G sensor (GL1 filter) / Min.: -1.869 G, Max.: 1.869	Approximately 0 +-0.13 G when vehicle is stationary	Reading changes when vehicle is bounced
      DECELERAT SENS2	G sensor (GL2 filter) / Min.: -1.869 G, Max.: 1.869	Approximately 0 +-0.13 G when vehicle is stationary	Reading changes when vehicle is bounced

      OK: Deceleration value changes. 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY 

   NG: Go to Next step 

2. INSPECT YAW RATE SENSOR (INCLUDE DECELERATION SENSOR)*2 
   1. Remove the console box and deceleration sensor.
   2. Connect 3 dry cell batteries of 1.5 V in series.
   3. Connect terminal 8 (VYS) to the batteries' positive (+) terminal and terminal 5 (GYAW) to the batteries' negative (-) terminal. Apply about 4.5 V between terminals 8 (VYS) and 5 (GYAW).
      NOTE: Do not apply voltage of 6 V or more to terminals 8 (VYS) and 5 (GYAW).
   4. Measure the voltage when the sensor is tilted forward and rearward.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Sensor Condition	Specified Condition
      4 (GL1) - Battery's negative (-) terminal	Horizontal	Approximately 2.3 V
      4 (GL1) - Battery's negative (-) terminal	Lean forward	2.3 to 3.5 V
      4 (GL1) - Battery's negative (-) terminal	Lean rearward	1.0 to 2.3 V
      2 (GL2) - Battery's negative (-) terminal	Horizontal	Approximately 2.3 V
      2 (GL2) - Battery's negative (-) terminal	Lean forward	1.0 to 2.3 V
      2 (GL2) - Battery's negative (-) terminal	Lean rearward	2.3 to 3.5 V

      Fig 1: Inspecting Yaw Rate Sensor

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • If the sensor is tilted too much, it may output the wrong value.
      • The sensor removed from the vehicle body should not be placed upside down.

   NG: REPLACE YAW RATE SENSOR 

   OK: Go to Next step 

3. CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - YAW RATE SENSOR) 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY