Test Mode Procedure

1. Release the parking brake.
   NOTE:

   Before releasing the parking brake, move the shift lever to P for safety (for automatic transmission) or set the chocks to hold the vehicle for safety (for manual transmission).

   HINT: 

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

2. When the engine switch is turned on (IG), check that the ABS warning, brake warning, VSC OFF indicator and slip indicator lights all come on and the TR(A)C OFF message will be displayed on the multi-information display for approximately 3 seconds.
   Fig 1: Identifying ABS Warning Light, Brake Warning Light, VSC OFF Indicator Light, & Slip Indicator Light

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   • If the skid control ECU stores any DTCs, the ABS warning and slip indicator lights will come on.
   • If any of the indicators remain on or do 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 circuit (Remains on)	Refer to Brake Warning Light Remains ON
   Brake warning light circuit (Does not come on)	Refer to Brake Warning Light does not Come ON
   Multi-information display (TR(A)C OFF indicator) circuit (Remains on)	Refer to TRAC OFF Indicator Light Remains ON
   Multi-information display (TR(A)C OFF indicator) circuit (Does not come on)	Refer to TRAC OFF Indicator 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 engine 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 a malfunction was found.

1. Procedure to enter Test Mode
   1. Turn the engine switch off.
   2. Check that the steering wheel is centered.
   3. Check that the shift lever is in P (for automatic transmission) or the parking brake is applied (for manual transmission).
   4. Connect the Techstream to the DLC3.
   5. Turn the engine 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 and slip indicator lights come on for several seconds and then blink in Test Mode.
      Fig 2: identifying ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the ABS warning and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning 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. Lost Booster Pressure Judgement Check and Master Cylinder Pressure Sensor Zero Point Calibration
   NOTE:

   Perform a check in the lost booster pressure state (vacuum in the booster is depressurized).

   1. Turn the engine switch on (IG).
   2. Check that the brake warning light comes on when depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more. (The lost booster pressure state is judged as normal.)
   3. Start the engine while depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more.
   4. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged as normal.)
   5. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
      NOTE:

      • If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
      • If the lost booster pressure judgement check results are not normal, then the master cylinder pressure sensor check cannot be performed.
      • If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.
3. Acceleration Sensor Check
   1. Keep the vehicle stationary on a level surface for 1 second or more.

      HINT: 

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

4. Master Cylinder Pressure Sensor Check
   1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, then quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22.0 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 is illuminated, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
      • The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
5. Speed Sensor Check
   1. Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more (Reverse signal check).
   2. Check that the ABS warning light goes off.

      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 45 km/h (28 mph) or more.

   3. Drive the vehicle straight-ahead.

      Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds (Forward signal check).

   4. Check that the ABS warning light goes off.

      HINT: 

      • The sensor check may not be completed if wheelspin occurs.
      • The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
      • The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
   5. Stop the vehicle.
      NOTE:

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

      HINT: 

      When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while the vehicle is stationary.

6. End of Sensor Check
   1. If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle is stopped and goes off while driving the vehicle.
      Fig 3: identifying ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002