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 (VEHICLE SPEED)*1 
   1. Check the DATA LIST for proper functioning of the vehicle speed.

      Skid control ECU with actuator: 

      SKID CONTROL ECU WITH ACTUATOR REFERENCE
      
      

      Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
      WHEEL SPD FR	Vehicle speed / Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph)	Almost equal to actual speed (When driving)	-
      WHEEL SPD FL	Vehicle speed / Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph)	Almost equal to actual speed (When driving)	-
      WHEEL SPD RR	Vehicle speed / Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph)	Almost equal to actual speed (When driving)	-
      WHEEL SPD RL	Vehicle speed / Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph)	Almost equal to actual speed (When driving)	-

      OK: Vehicle speed displayed on tester is almost equal to actual vehicle speed. 

   NG : GO TO  BRAKE SYSTEM 

   OK : GO TO NEXT STEP 

2. CHECK WIRE HARNESS (COMBINATION METER - SKID CONTROL ECU WITH ACTUATOR)*2 
   1. Disconnect the C10 meter connector.
   2. Disconnect the S1 ECU connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      C10-10 (SP) - S1-12 (SP1)(1)	Below 1 Ω
      C10-10 (SP) - S1-26 (SP1)(2)	Below 1 Ω
      C10-10 (SP) - Body ground	10 kΩ or higher
      (1) w/o VSC (2) w/ VSC

      Fig 1: Disconnecting S1 ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK : GO TO NEXT STEP 

3. CHECK SKID CONTROL ECU WITH ACTUATOR (SP1 VOLTAGE) 
   1. Disconnect the S1 ECU connector.
   2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      Fig 2: Disconnecting S1 ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      S1-12 (SP1)(1) - Body ground	Ignition switch ON	10 to 14 V
      S1-26 (SP1)(2) - Body ground	Ignition switch ON	10 to 14 V
      (1) w/o VSC (2) w/ VSC

   NG : REPLACE COMBINATION METER ASSEMBLY 

   OK : GO TO NEXT STEP 

4. CHECK COMBINATION METER ASSEMBLY 
   1. Remove the combination meter but do not disconnect the connectors.
   2. Start the engine.
   3. Using an oscilloscope, check the signal waveform of the meter.
      Fig 3: Checking Signal Waveform Of Meter

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ITEM CONTENT
      
      

      Item	Content
      Terminal No.	C10-10 (SP) - Body ground
      Tool setting	5 V/DIV., 20 msec./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12.4 mph)

      OK: As shown in the illustration. 

      HINT:

      As the vehicle speed increases, the wavelength shortens.

   NG : GO TO  BRAKE SYSTEM 

   OK : REPLACE COMBINATION METER ASSEMBLY