Test Mode Procedure

1. Release the parking brake pedal.
   NOTE: When releasing the parking brake, move the P position switch into the P position to hold the vehicle for safety.

   HINT:

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

2. When the power switch is ON (READY), check that the ABS warning light, VSC warning light, BRAKE warning light, Brake Control warning light and SLIP indicator light come on for approximately 3 seconds.

   HINT:

   • If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit, VSC warning light circuit, BRAKE warning light circuit, Brake Control warning light circuit or SLIP indicator light circuit.
   • If the indicator remains on, proceed to troubleshooting for the light circuit below.
     TROUBLESHOOTING CHART
     
     

     Trouble Area	See procedure
     ABS warning light circuit	ABS WARNING LIGHT DOES NOT COME ON
     VSC warning light circuit	VSC WARNING LIGHT REMAINS ON
     BRAKE warning light circuit	BRAKE WARNING LIGHT CIRCUIT
     Brake Control warning light circuit	BRAKE CONTROL WARNING LIGHT REMAINS ON
     SLIP indicator light circuit	SLIP INDICATOR LIGHT CIRCUIT

     Fig 1: Identifying Test Mode Procedure

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• Set the vehicle in the TEST MODE and perform the following procedures to check operation of the deceleration sensor, master cylinder pressure sensor, speed sensor and yaw rate sensor.
• Check results are indicated by DTCs output only in the TEST MODE.
• Perform the following procedures (step 1 to step 5) as a set.
• When entering the test mode, the skid control ECU records all the test mode codes and clears the codes judged to be normal.
• During test mode, Enhanced VSC does not operate regardless of whether or not the sensor check result is normal or if there is a malfunction.
• When the mode returns to the normal mode, all the test mode codes are cleared.
• The ABS warning light and VSC warning light comes on if the sensor has a malfunction.

1. Step 1: Procedures for test mode
   1. Turn the power switch OFF.
   2. Connect the intelligent tester (with CAN VIM) to the DLC3.
   3. Check that the steering wheel is in the centered position and move the shift lever to the P position.
   4. Turn the power switch ON (READY).
      Fig 2: Connecting Intelligent Tester To DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Select the SIGNAL CHECK following the intelligent tester screen.
   6. Check that the ABS warning light and VSC warning light indicates TEST MODE.

      HINT:

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

      TROUBLESHOOTING CHART
      
      

      Trouble Area	See Procedure
      ABS warning light circuit	ABS WARNING LIGHT DOES NOT COME ON
      VSC warning light circuit	VSC WARNING LIGHT DOES NOT COME ON

      Fig 3: ABS Warning Light Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   7. Start the engine.
2. Step 2: Check deceleration sensor
   1. Check that the ABS warning light is blinking in TEST MODE.
   2. Keep the vehicle in the stationary condition on a level surface for 1 second or more.

      HINT:

      The blinking pattern of the ABS warning light and VSC warning light do not change. When the sensor is normal and in the test mode, if the above conditions are met, the check is completed.

3. Step 3: Check yaw rate sensor
   1. Shift the shift lever to the D range and drive the vehicle at the vehicle speed of approx. 5 km/h (3 mph), turn the steering wheel either to left or right 90° or more, and drive in a half-circle pattern.
      NOTE:

      • The vehicle direction at the end should be 180 +-5 ° or less.
      • While turning do not move the shift lever to the P position. Do not turn the power switch OFF.
        Fig 4: [Turning Steering Wheel In Half-Circle Pattern]

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • The turning direction is not important.
      • Turning should be completed within 2.0 seconds. However, it is possible to change the vehicle speed, stop or more backward.
   2. Stop the vehicle and move the shift lever to the P position, check that the skid control buzzer sounds for 3 seconds.

      HINT:

      • If the skid control buzzer sounds, the sensor 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 sensor check again.
      • If the skid control buzzer still will not sound, there is a malfunction in the Enhanced VSC sensor, so check the DTC.
      • Drive the vehicle in a half-circle pattern. 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.
4. Step 4: Check master cylinder pressure sensor
   1. Check that the ABS warning light is blinking in TEST MODE.
   2. Leave the vehicle in a stationary condition and the brake pedal in a free condition 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.
   3. While the vehicle is stopped, release the brake pedal.
   4. While the vehicle is stopped, quickly depress the brake pedal once or more and check the ABS warning light is lit for 3 seconds.
      Fig 5: ABS Warning Light Blinking Pattern In Test Mode

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • While the ABS warning light is lit, maintain the condition a brake pedal load of approximately 98 N or more is applied.
      • During the test mode, the ABS warning light comes on for 3 seconds every time the above pedal operation.
      • If the master cylinder pressure sensor check is not completed, randomly depressing the brake pedal will cause the negative pressure to decrease further and the sensor check will be difficult to be completed.
      • If the negative pressure is insufficient, the master cylinder pressure sensor check may not be completed. In this case, turn the engine idle to make the negative pressure sufficient.
      • Strongly depress the brake pedal when the negative pressure is insufficient. The brake warning light may come on with the fail-safe function.
5. Step 5: Check speed sensor
   1. Check the ABS warning light is blinking of TEST MODE.
   2. Start the sensor signal check.
   3. Drive the vehicle straight forward. Drive the vehicle at a speed of 45 to 80 km/h (28 to 50 mph) or higher for several seconds and check that the ABS warning light goes off.
      VEHICLE SPEED CHECK
      
      

      Vehicle Speed	Test	Check
      0 to 45 km/h (0 to 28 mph)	Low speed test	Response of sensors
      45 to 80 km/h (28 to 50 mph)	Middle speed test	Deviations of sensor signal

      Fig 6: ABS Warning Light Blinking Pattern Of Test Mode

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002