Inspection Procedure

1. Check if the DTCs for VSC are recorded. (See DTC CHECK/CLEAR  )

1. NO : Go to step 2 
2. YES : REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

1. NO : CONNECT CONNECTOR TO ECU 
2. YES : Go to next step. 

1. Check battery positive voltage.

   Standard: 

   Voltage: 11 to 14 V 

1. NG: INSPECT CHARGING SYSTEM 
2. OK: Go to next step. 

WHEN USING HAND-HELD TESTER: 

1. Connect the hand-held tester to the DLC3.
2. Start the engine.
3. Select the DATA LIST mode on the hand-held tester.
4. Check the voltage condition output from the ECU displayed on the hand-held tester.
   IG VOLTAGE REFERENCE
   
   

   Item	Measurement Item / Range (Display	Normal Condition	Diagnostic Note
   IG VOLTAGE	ECU power supply voltage/NORMAL or TOOL LOW	NORMAL: 9.5 V or over TOO LOW: Below 9.5 V	-

   Standard: 

   "NORMAL" is displayed. 

WHEN NOT USING HAND-HELD TESTER: 

1. Disconnect the skid control ECU connector.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value (s) in the table below.

   Standard: 

   SKID CONTROL ECU TERMINAL VOLTAGE
   
   

   Tester Connection	Specified Condition
   IG1 (S3-46) - GND (S3-1, 32)	11 to 14 V

   Fig 1: Identifying Skid Control ECU Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: Go to next step. 

1. Disconnect the skid control ECU connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard: 

   SKID CONTROL ECU - BODY GROUND RESISTANCE
   
   

   Tester Connection	Specified Condition
   GND (S3-1, 32) - Body ground	1 Ω or less

   Fig 2: Identifying Skid Control ECU - Body Ground Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: Go to next step. 

WHEN USING HAND-HELD TESTER: 

1. Connect the hand-held tester to the DLC3 and start the engine.
2. Select the item "VSC WARN LIGHT" in the ACTIVE TEST and operate the VSC warning light on the hand-held tester.
3. Check that "ON" and "OFF" of the VSC warning light can be shown on the combination meter by the hand-held tester.
   VSC WARNING LIGHT REFERENCE
   
   

   Item	Vehicle Condition / Test Details	Diagnostic Note
   VSC WARN LIGHT	Turns VSC warning light ON / OFF	Observe combination meter

WHEN NOT USING HAND-HELD TESTER: 

1. Turn the ignition switch off and disconnect the connector from the skid control ECU.
2. Turn the ignition switch to the ON position.
3. Check the VSC warning light turns off.

   Standard: 

   VSC warning light turns off. 

   Fig 3: Identifying VSC Warning Light Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: CHECK AND REPAIR VSC WARNING LIGHT CIRCUIT 
2. OK: REPLACE BRAKE ACTUATOR ASSY (See  BRAKE ACTUATOR ASSY  ) 
   NOTE: When replacing the brake actuator assy, perform the zero point calibration (See  CALIBRATION  ).