Test Mode Procedure

Fig 1: Identifying ABS Warning Light And Brake Indicator Lights

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Release the parking brake
   CAUTION: When releasing the parking brake, set chocks to hold the vehicle for safety.
2. When the power switch is ON (IG), check that the ABS warning light, brake warning light / red (malfunction), brake warning light / yellow (minor malfunction), slip, brake hold standby and brake hold operated indicator lights illuminate and then turn off after the engine starts.

   If a light remains on, proceed to troubleshooting for the light circuit below.

   TROUBLE AREA REFERENCE
   
   

   Trouble Area	See procedure
   ABS warning light circuit (light remains on)	ABS WARNING LIGHT REMAINS ON
   ABS warning light circuit (light does not come on)	ABS WARNING LIGHT DOES NOT COME ON
   Brake warning light / red (malfunction) circuit (light remains on)	BRAKE WARNING LIGHT REMAINS ON
   Brake warning light / red (malfunction) circuit (light does not come on)	BRAKE WARNING LIGHT DOES NOT COME ON
   Brake warning light / yellow (minor malfunction) circuit (light remains on)	BRAKE CONTROL WARNING LIGHT REMAINS ON
   Brake warning light / yellow (minor malfunction) circuit (light does not come on)	BRAKE CONTROL WARNING LIGHT DOES NOT COME ON
   Slip indicator light circuit	SLIP INDICATOR LIGHT CIRCUIT
   Brake hold standby indicator light circuit	BRAKE HOLD STANDBY INDICATOR LIGHT CIRCUIT
   Brake hold operated indicator light circuit	BRAKE HOLD OPERATED INDICATOR LIGHT CIRCUIT

HINT:

• When having replaced the skid control ECU and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.
• If the power switch is turned from ON (IG) to ON (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 power switch OFF.
   2. Connect the Intelligent tester or Techstream to the DLC3.
   3. Check that the steering wheel is centered and move the shift lever to the P position.
   4. Turn the power switch ON (IG).
   5. Set the Intelligent tester or Techstream to Test Mode (select "Signal Check").

      HINT:

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

   6. Check that the ABS warning light and brake warning light / yellow (minor malfunction) blink and "VSC TEST" is indicated on the multi-information display (Test Mode).

      HINT:

      If the ABS warning light and brake warning light / yellow (minor malfunction) do not blink, inspect the TS and CG terminal circuit, ABS warning light circuit and/or brake warning light / yellow (minor malfunction) (multi-information display) circuit.

      Fig 2: ABS Warning Light - Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   7. Check the following sensors as described below.
      • Acceleration sensor
      • Master cylinder pressure sensor
      • Speed sensor
      • Yaw rate sensor

      HINT:

      Make sure that the ABS warning light is blinking in Test Mode before performing the check.

      Fig 3: ABS Warning Light - Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Keep the vehicle stationary on a level surface for 1 second or longer.

   HINT:

   The 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 continuously with a force of 98 N (10 kgf, 22.0 lbf) or more for 1 second.
2. Check that the 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, 22.0 lbf) or more.
   • The ABS warning light comes on for 3 seconds every time brake pedal operation above is performed.

1. Check the forward signal.
   1. Drive the vehicle straight ahead.

      Drive the vehicle at a speed of 45 km/h (28 mph) or higher for several seconds.

      HINT:

      The signal check may not be completed if the vehicle has its wheels spun.

2. Check the backward signal.
   1. Drive the vehicle in reverse for more than 1 second at a speed of 3 km/h (2 mph) or higher and check that the ABS warning light goes off.

      HINT:

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

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.
   • 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 the vehicle is stationary.

   Fig 4: Vehicle Speed - Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Perform the check after checking that the brake warning light / yellow (minor malfunction) blinks and that "VSC TEST" is indicated on the multi-information display
2. Check the zero point voltage of the yaw rate sensor
   1. Keep the vehicle stationary on a level surface for 1 second or longer

      HINT:

      When changing to test mode, if a part or wire harness is malfunctioning, the ABS warning light and brake warning light / yellow (minor malfunction) remain illuminated

      Fig 5: ABS Warning Light - Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the output of the yaw rate sensor and the direction of the steering angle sensor
   1. Move the shift lever from the P to the D position, 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 6: Identifying Yaw Rate Sensor Output & Steering Angle Sensor Direction

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • At the end of the 180° turn, the direction of the vehicle should be within 175 to 185° of its start position
      • Do not spin the wheels
      • Do not turn the power switch OFF while turning
      • Do not move the shift lever to the P position while turning, but changing the vehicle speed, stopping, or driving in reverse is possible.
      • Complete the turn within 20 seconds
   2. Stop the vehicle and move the shift lever to the P position Check that the skid control buzzer sounds for 3 seconds

      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, then perform the signal check again. If the skid control buzzer still does not sound, there may be a malfunction in the yaw rate sensor, so check the DTC

1. Enter test mode and wait for 1 second or more.

   HINT:

   • This check cannot be performed when the yaw rate sensor has a communication malfunction.
   • The yaw rate sensor must be normal and must not have a communication malfunction If so, and if the procedure above is performed, the check is complete.
     NOTE: If the yaw rate sensor has a discrimination malfunction, perform the yaw rate sensor and G sensor zero point calibration.

1. If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops, and the ABS warning light goes off when the vehicle is driving
   Fig 7: ABS Warning Light - Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002