Test Mode Procedure

1. Release the parking brake.
   NOTE:

   When releasing the parking brake, move the shift lever to P for safety.

   HINT: 

   When the parking brake is applied or the brake fluid level is low, the brake warning light / red (malfunction) comes on.

2. When the power switch is turned on (IG), check that the VSC OFF indicator light comes on for approximately 3 seconds, and ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights remain on until the power switch is turned on (READY).
   Fig 1: Identifying ABS Warning, Brake Warning & VSC OFF Indicator Lights

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   • If the skid control ECU stores any DTCs, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights will come on.
   • If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

   Trouble Area	See Procedure
   ABS warning light circuit (Remains on)	Refer to ABS Warning Light Remains ON
   ABS warning light circuit (Does not come on)	Refer to ABS Warning Light does not Come ON
   Brake warning light / red (malfunction) circuit (Remains on)	Refer to Brake Warning Light Remains ON
   Brake warning light / red (malfunction) circuit (Does not come on)	Refer to Brake Warning Light does not Come ON
   Brake warning light / yellow (minor malfunction) circuit (Remains on)	Refer to Brake Control Warning Light Remains ON
   Brake warning light / yellow (minor malfunction) circuit (Does not come on)	Refer to Brake Control Warning Light does not Come ON
   VSC OFF indicator light circuit (Remains on)	Refer to VSC OFF Indicator Light Remains ON
   VSC OFF indicator light circuit (Does not come on)	Refer to VSC OFF Indicator Light does not Come ON
   Slip indicator light circuit (Remains on)	Refer to Slip Indicator Light Remains ON
   Slip indicator light circuit (Does not come on)	Refer to Slip Indicator Light does not Come ON

HINT: 

• If the power switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared.
• During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes where an abnormality was found.

1. Procedure to enter the Test Mode
   1. Turn the power switch off.
   2. Check that the steering wheel is centered.
   3. Check that the shift lever is in P.
   4. Connect the Techstream to the DLC3.
   5. Turn the power switch on (IG).
   6. Turn the Techstream on.
   7. Switch the skid control ECU to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.
   8. Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in Test Mode.
      Fig 2: ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits.

   9. Check the ABS sensors.

      HINT: 

      Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.

2. Acceleration Sensor Check
   1. Keep the vehicle stationary on a level surface for 2 seconds or more.

      HINT: 

      The acceleration sensor check can be performed with the master cylinder pressure sensor check below.

3. Master Cylinder Pressure Sensor Check
   NOTE:

   Before performing the master cylinder pressure sensor check, perform linear valve offset learning.

   1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22 lbf) for 1 second.
   2. Check that the ABS warning light stays on for 3 seconds.

      HINT: 

      • Confirm that the ABS warning light comes on.
      • While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.
      • The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
4. Speed Sensor Check
   NOTE:

   Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.

   1. Drive the vehicle straight-ahead.

      Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.

      HINT: 

      • The sensor check may not be completed if wheelspin occurs.
      • The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
   2. Stop the vehicle.
      NOTE:

      • The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.
      • After the ABS warning light goes off, if vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
      • If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.
   3. Check the VSC sensor.

      HINT: 

      Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode blinking pattern before performing the VSC sensor check.

5. Yaw Rate Sensor Zero Point Voltage Check
   NOTE:

   Before performing the yaw rate sensor zero point voltage check, perform linear valve offset learning.

   1. Keep the vehicle stationary on a level surface for 4 seconds or more.
6. Yaw Rate Sensor Output Check
   1. Move the shift lever from P to D and drive the vehicle at a speed of approximately 5 km/h (3 mph), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
      Fig 3: Identifying Vehicle Start Making A 180 Degree Turn

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002