Inspection Procedure

1. Operate the intelligent tester according to the step on the display and select "DATA LIST".

   ABS/TRAC/VSC 

   DATA LIST - ABS/TRAC/VSC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   (FR/FL/RR/RL) WHEEL SPD	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Almost the same as actual speed (When driving)	-

   OK: 

   Vehicle speed display on the tester is almost the same as the actual vehicle speed. 

NG: GO TO BRAKE CONTROL SYSTEM

OK: Go to next step 

1. Disconnect the C6 meter connector.
2. Using an oscilloscope, check the signal waveform of the meter.
   WAVEFORM REFERENCE
   
   

   Tester Connection	Tool setting	Vehicle condition
   C6-25 - Body ground	5V/DIV., 20 ms./DIV.	Driving at approx. 20 km/h (12.4 mph)

   Fig 1: Identifying C6 Combination Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   As shown in  Fig 1 . 

   HINT:

   As vehicle speed increases, the cycle of the signal waveform narrows.

NG: Go to step 3 

OK: REPLACE COMBINATION METER ASSEMBLY 

1. Disconnect the C6 meter connector.
2. Disconnect the S1 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   C6-25 - S1-26	Below 1 Ω
   C6-25 - Body ground	10 kΩ or higher

   Fig 2: Identifying Combination Meter And Brake Actuator Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Disconnect the S1 ECU connector.
   Fig 3: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   S1-26 - Body ground	Ignition switch ON	11 to 14 V

3. Measure the resistance of the wire harness side connector.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   S1-2 - Body ground	Below 1 Ω

NG: REPLACE COMBINATION METER ASSEMBLY 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY