Operation Check

HINT:

• If the ECU stores a DTC, the ABS, VSC TRAC and BRAKE warning lights and VSC OFF indicator light come ON.
• If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit, VSC TRAC warning light circuit, BRAKE warning light circuit, VSC OFF indicator light circuit, SLIP indicator light circuit and VSC TRAC indicator light circuit.

1. Turn the ignition switch OFF.
2. Using SST, connect terminals 12 (TS) and 4 (CG) of DLC3.

   SST 09843-18040 

3. Check that the steering wheel is in the straight-ahead position and move the shift lever to P.
4. Turn the ignition switch ON.
5. Check that the ABS warning light and VSC TRAC warning light blinks as shown in illustration.
   Fig 2: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   If no code appears, check the TC circuit, ABS warning light circuit and VSC TRAC warning light circuit.

   TROUBLE AREA REFERENCE
   
   

   Trouble Area	See procedure
   TC terminal circuit	TC AND CG TERMINAL CIRCUIT
   ABS warning light circuit	ABS WARNING LIGHT CIRCUIT

   Fig 3: ABS & VSC TRAC Warning Light - Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TROUBLE AREA REFERENCE
   
   

   Trouble Area	See procedure
   VSC TRAC warning light circuit	VSC TRAC Warning Light Circuit

1. Create gravitational force (0.2 G or more) on the vehicle through deceleration. Use one of the following methods to decelerate the vehicle in the direction it is moving:
   • Apply the brakes.
   • Drive over a bump.
   • Drive on an incline.
2. When the deceleration is 0.2 G or more, check that the ABS warning light illuminates.

1. Leave the vehicle in a stationary condition and the brake pedal released for 1 second or more. Then quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.

   HINT:

   At this time, the ABS warning light turns on for 3 seconds.

   Fig 4: ABS Warning Light Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Drive the vehicle straight forward at the following speed. Then check the ABS warning light.
   VEHICLE SPEED
   
   

   Vehicle Speed	Check	ABS Warning Light
   3 to 5 km/h (2 to 3 mph)	Response of sensors	Blinking
   45 km/h (28 mph) or higher	Deviations of sensor signal	Turns off

   HINT:

   The sensor signal check may not complete if the vehicle's wheels slip or the steering wheel is turned during this check.

2. Stop the vehicle.
3. Read the DTCs.
4. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

   SST 09843-18040 

   Fig 5: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Read the number of blinks of the ABS warning light.
   Fig 6: ABS Warning Light Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   • As an example, the blinking patterns for trouble codes 72 and 76 are shown above.
   • Conditions are explained in Diagnostic Trouble Code chart.
   • For the normal code, the light cycles between ON and OFF at intervals of 0.25 seconds.
   • If more than 1 DTC is detected at the same time, the lowest numbered code will be displayed first.
6. After the check, disconnect SST from terminals 13 (TC) and 4 (CG) of the DLC3.

1. Move the shift lever to D and drive the vehicle at the vehicle speed of approximately 5 km/h (3 mph). Turn the steering wheel either to left or right 90° or more, and drive the vehicle in a half-circle pattern.
2. Stop the vehicle and move the shift lever to P. Check that the VSC buzzer sounds for 3 seconds.

   If the VSC buzzer sounds, the sensor check has completed normally.

   If the VSC buzzer does not sound, check the VSC buzzer circuit and check the sensor again.

   If the VSC buzzer still does not sound, there is malfunction in the VSC sensor. Check the DTCs.

   HINT:

   Fig 7: Checking Yaw Rate Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • Drive the vehicle in a half-circle pattern. At the end of the turn, the direction of the vehicle should be within 180 +- 5° from its start position.
   • Do not spin the wheels.
3. Read the DTCs.
4. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

   SST 09843-18040 

5. Read the number of blinks of the VSC TRAC warning light.
   Fig 8: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002