Inspection Procedure

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

   Skid control ECU with actuator 

   ITEM AND NORMAL CONDITION
   
   

   Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
   (FR/FL/RR/RL) Wheel Speed	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.
   TESTER CONNECTION AND VEHICLE CONDITION
   
   

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

   OK: As shown in the illustration. 

   Fig 1: Identifying C6 Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

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

   Fig 2: Identifying S1 ECU And C6 Meter 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.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   S1-26 - Body ground	Ignition switch ON	10 to 14 V

   Fig 3: Identifying S1 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

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

NG : REPLACE COMBINATION METER ASSEMBLY 

OK : REPLACE BRAKE ACTUATOR ASSEMBLY