Test Mode Procedure

1. Release the parking brake.
   NOTE: When releasing the parking brake, move the shift lever to P for safety (for automatic transaxle) or set the chocks to hold the vehicle for safety (for manual transaxle).

   HINT:

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

2. When the ignition switch is turned to ON, check that the ABS warning, brake warning, VSC OFF indicator and slip indicator lights come on for approximately 3 seconds.

   HINT:

   • If the skid control ECU stores any DTCs, the ABS warning, brake warning and slip indicator lights will come on and the VSC OFF indicator light will blink.
   • If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.
     TROUBLESHOOTING REFERENCE 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
     Brake warning light circuit (Remains on)	BRAKE WARNING LIGHT REMAINS ON
     Brake warning light circuit (Does not come on)	BRAKE WARNING LIGHT DOES NOT COME ON
     VSC OFF indicator light circuit (Remains on)	VSC OFF INDICATOR LIGHT REMAINS ON
     VSC OFF indicator light circuit (Does not come on)	VSC OFF INDICATOR LIGHT DOES NOT COME ON
     Slip indicator light circuit (Remains on)	SLIP INDICATOR LIGHT REMAINS ON
     Slip indicator light circuit (Does not come on)	SLIP INDICATOR LIGHT DOES NOT COME ON

     Fig 1: Identifying ABS And Brake Warning Light Indicator

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• If the ignition switch is turned from ON to 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 of the sensor check function. 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 ignition switch off.
   2. Check that the steering wheel is centered.
   3. Check that the shift lever is in P (for automatic transaxle) or the parking brake is applied (for manual transaxle).
   4. Connect the Techstream to the DLC3.
   5. Turn the ignition switch to ON.
   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 VSC OFF indicator lights come on for several seconds and then blink in Test Mode.

      HINT:

      • The slip indicator light remains on during Test Mode because traction control operation is prohibited (The slip indicator light goes off when the VSC OFF switch is on).
      • If the ABS warning and VSC OFF indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and VSC OFF indicator light circuits.
        Fig 2: ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TROUBLESHOOTING REFERENCE CHART
        
        

        Trouble Area	See Procedure
        TS and CG terminal circuit	TS AND CG TERMINAL CIRCUIT
        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 OFF indicator light circuit (Remains on)	VSC OFF INDICATOR LIGHT REMAINS ON
        VSC OFF indicator light circuit (Does not come on)	VSC OFF INDICATOR LIGHT DOES NOT COME ON

   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.

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.

   Fig 3: ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Keep the vehicle stationary and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more 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 lbf) or more.
   • The ABS warning light comes on for 3 seconds every time brake pedal operation above is performed.
   • If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in the vacuum in the brake booster, making the sensor check difficult to complete.
   • If the vacuum remaining in the booster is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum.
   • If the brake pedal is strongly depressed when the vacuum in the booster is insufficient, the brake warning light may come on in accordance with the booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.

1. Check the speed sensor signal.
   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 wheels pin 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 after a malfunction has been detected during the speed sensor check.
2. 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.

3. Check the VSC sensor.

   HINT:

   Check that the VSC OFF indicator light blinks before performing the VSC sensor check.

1. Check the output of the yaw rate sensor.
   1. Keep the vehicle stationary on a level surface for 1 second or more.
      Fig 4: ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Move the shift lever from P to D (for automatic transaxle) or release the parking brake (for manual transaxle) 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.
   3. Stop the vehicle and move the shift lever to P (for automatic transaxle) or apply the parking brake (for manual transaxle). Check that the skid control buzzer sounds for 3 seconds.
      Fig 5: Identifying Vehicle Start And End Position

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • If the skid control buzzer sounds, the sensor check has 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 does not sound, the yaw rate sensor may be malfunctioning. Check for DTCs.
      • 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 P (for automatic transaxle) or do not apply the parking brake (for manual transaxle) while turning, but changing the vehicle speed, stopping, or driving in reverse is acceptable.
      • 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 while the vehicle is driving.
   Fig 6: ABS And VSC OFF Indicator Light Test Mode Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002