Test Mode Procedure

1. Release the parking brake.
   NOTE: Before releasing the parking brake, move the shift lever to the P position for safety.

   HINT:

   When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.

   Fig 1: Identifying Warning Light And Indicator Light

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. When the ignition switch is turned on (IG), check that the ABS warning light, VSC warning light, BRAKE warning light and SLIP indicator light come on for approximately 3 seconds.

HINT:

If the skid control ECU stores any DTCs, the ABS warning light, VSC warning light and SLIP indicator light come on.

If the indicator remains on or does not come on, proceed to troubleshooting for the light circuit below.

When having replaced the ABS & TRACTION actuator assembly and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

HINT:

• If the ignition switch is turned from on (IG) to on (ACC) or to the ACC or off during test mode (SIGNAL CHECK), DTCs of the signal check function will be erased.
• During test mode (SIGNAL CHECK), the skid control ECU records all DTCs of the signal check function. By performing the test mode (SIGNAL CHECK), the codes are erased if normality is confirmed. The remaining codes are the codes where an abnormality was found.

1. Procedure for test mode.
   1. Turn the ignition switch off.
   2. Connect Techstream to the DLC3.
   3. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position. (Procedure A)
   4. Turn the ignition switch on (IG). (Procedure B)
   5. Set Techstream to test mode (select "SIGNAL CHECK"). (Procedure C)

      HINT:

      Refer to the Techstream operator's manual for further details.

   6. Check that the ABS and VSC warning lights are blinking in TEST MODE.

      HINT:

      If the ABS and VSC warning lights do not blink, inspect the ABS warning light circuit and/or VSC warning light circuit.

      TROUBLESHOOTING CHART
      
      

      Trouble area	See procedure
      ABS warning light circuit (Remains on)	ABS WARNING LIGHT REMAINS ON
      ABS warning light circuit (Does not come on)	ABS WARNING LIGHT DOES NOT COME ON
      VSC warning light circuit (Remains on)	VSC WARNING LIGHT REMAINS ON
      VSC warning light circuit (Does not come on)	VSC WARNING LIGHT DOES NOT COME ON

      Fig 2: ABS And VSC Warning Lights Blinking Pattern In Test Mode

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   7. Check the ABS sensor.

HINT:

Check that ABS warning light is blinking in TEST MODE and perform the check. (See procedure A to C)

Fig 3: ABS Warning Light Blinking Pattern In Test Mode

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Keep the vehicle in the stationary condition on a level surface for 1 second or more.

HINT:

Acceleration sensor check can be performed with the following master cylinder pressure sensor check.

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

HINT:

• Ensure 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 brake pedal operation above is performed.

1. Check the backward signal.
   1. Drive the vehicle in reverse for more than 1 second at 2 mph (3 km/h) or higher.

   HINT:

   Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 28 mph (45 km/h) or more.

2. Check the forward signal.
   1. Drive the vehicle straight forward. Accelerate the vehicle to a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off.

   HINT:

   The signal check may not be completed if the vehicle has its wheels spun or the steering wheel turned during this check.

3. Stop the vehicle.
   NOTE:

   • Before performing the speed sensor signal check, complete the acceleration sensor and master cylinder pressure sensor checks.
   • The speed sensor signal check may not be completed if the speed sensor signal check is started while turning the steering wheel or spinning the wheels.
   • After the ABS warning light goes off and if the vehicle speed exceeds 50 mph (80 km/h), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
   • If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.

   HINT:

   When the signal check has been completed, the ABS warning light goes off while driving and blinks in the test mode pattern while stationary.

4. Check the VSC sensor.
   1. Check that the VSC warning light is blinking in TEST MODE and perform the check.
      Fig 4: VSC Warning Light Blinking Pattern In Test Mode

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the VSC warning light is blinking in TEST MODE.
2. Check the zero point voltage of the yaw rate sensor.
   1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
3. Check the output of the yaw rate sensor and the direction of the steering angle sensor.
   1. Move the shift lever to the D position and drive the vehicle at a speed of approximately 3 mph (5 km/h), turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
   2. Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.
   Fig 5: Moving Shift Lever To D Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   • If the skid control buzzer sounds, the signal check is completed normally.
   • If the skid control buzzer does not sound, check the skid control buzzer circuit (See SKID CONTROL BUZZER CIRCUIT ), then perform the signal check again.
   • If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.
   • Make a 180° turn. At the end of the turn, the direction of the vehicle should be within 180° +- 5° of its start position.
   • Do not spin the wheels.
   • Do not turn the ignition switch off while turning.
   • Do not move the shift lever to the P position while turning, but change in the vehicle speed, stopping, or driving in reverse is possible.
   • Complete the turn within 20 seconds.

1. If the sensor check is completed, the ABS warning light blinks (test mode) when the vehicle stops and the ABS warning light is off when the vehicle is driving.