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Test Mode Procedure

  1. WARNING LIGHT AND INDICATOR LIGHT BULB CHECK 
    1. Check the warning lights.
      1. Release the parking brake pedal.
      2. When the ignition switch is turned to the ON position, cheek that the ABS warning light, BRAKE warning light, VSC warning light, TRAC OFF indicator light (2WD) and SLIP indicator light stay on for approximately 3 seconds.
        Fig 1: Identifying ABS Warning Light & Brake Warning Light
        G05139652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        • When the parking brake is applied or the level of brake fluid is low, the BRAKE warning light comes on.
        • If the ECU has any stored DTCs, the ABS warning light, VSC warning light, and TRAC OFF indicator light (2WD) come on.
        • If the indicator does not come on, check if the bulb is defective, and also check the wire harness between the skid control ECU and the combination meter.
        • If the indicator remains on, proceed to troubleshooting for the light circuit below.
          TROUBLESHOOTING TABLE

          Trouble Area Information
          ABS warning light circuit ABS WARNING LIGHT REMAINS ON 
          VSC warning light circuit VSC WARNING LIGHT REMAINS ON 
          BRAKE warning light circuit BRAKE WARNING LIGHT REMAINS ON 
          TRAC OFF indicator light circuit (2WD) TRAC OFF INDICATOR LIGHT, TRAC OFF SWITCH CIRCUIT 
          SLIP indicator light circuit SLIP INDICATOR LIGHT REMAINS ON 
  2. SENSOR SIGNAL CHECK USING TEST MODE (SIGNAL CHECK) (WHEN USING INTELLIGENT TESTER): 
    1. When having replaced the skid control ECU and/or yaw rate and deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor.

      HINT:

      • If the ignition switch is turned from the ON position to the ACC or off during test mode (signal check), DTCs recorded during the signal check 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 the items they relate to be confirmed to be normal. The remaining codes are the codes that relate to items which could not be confirmed to be normal.
    2. Procedures to enter test mode.
      1. Turn the ignition switch off.
      2. Connect the intelligent tester to the DLC3.
        Fig 2: Connecting Intelligent Tester To DLC3
        G05272662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Check that the steering wheel is in the straight ahead position and move the shift lever to the P position.
      4. Turn the ignition switch to the ON position.
      5. Set the intelligent tester to test mode (select "SIGNAL CHECK").

        HINT:

        Refer to the intelligent tester operator's manual for further details.

        Fig 3: Identifying Consult-II Display Signal Check
        G04977893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Check that the ABS warning light and VSC warning light blink and "CHECK VSC SYSTEM" is displayed on the multi-information display (test mode).

        HINT:

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

        TROUBLESHOOTING TABLE

        Trouble Area Information
        ABS warning light ABS WARNING LIGHT DOES NOT COME ON 
        VSC warning light VSC WARNING LIGHT DOES NOT COME ON 
        Fig 4: Identifying Blinking Pattern TEST MODE (ABS & VSC Warning Light)
        G05241616Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. MASTER CYLINDER PRESSURE SENSOR CHECK (WHEN USING INTELLIGENT TESTER): 
    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 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 lbf) or more.
      • The ABS warning light comes on for 3 seconds every time brake pedal operation specified in the previous step is performed.
  4. SPEED SENSOR CHECK (WHEN USING INTELLIGENT TESTER): 
    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 ahead. Drive the vehicle at a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off.

        HINT:

        The sensor check may not be completed if wheel spin occurs, or if the steering wheel is turned during this check.

    3. Stop the vehicle.
  5. YAW RATE SENSOR CHECK (WHEN USING INTELLIGENT TESTER): 
    1. Check the output of the yaw rate sensor.
      1. Move the shift lever to the D position, drive the vehicle at a speed of approximately 3 mph (5 km/h), and 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.

        HINT:

        • If the skid control buzzer sounds, the signal check has been 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 is a malfunction in the VSC 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.
          Fig 5: Identifying Blinking Pattern TEST MODE
          G05241617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL CHECK) (WHEN USING SST CHECK WIRE): 
    1. When having replaced the skid control ECU and/or yaw rate and deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor.

      HINT:

      • If the ignition switch is turned from the ON position to the ACC or off during test mode (signal check), DTCs recorded during the signal check 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.
    2. Procedures to enter test mode.
      1. Turn the ignition switch off.
      2. Check that the steering wheel is in the straight ahead position and move the shift lever to the P position.
      3. Using STT, connect terminals TS and CG of the DLC3.

        SST 09843-18040 

        Fig 6: Identifying DLC3 Connector Terminal
        G05272658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the ignition switch to the ON position.
      5. Check that the ABS warning light and VSC warning light blink (test mode).

        HINT:

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

        TROUBLESHOOTING TABLE

        Trouble Area Information
        TS and CG terminal circuit TS AND CG TERMINAL CIRCUIT 
        ABS warning light circuit ABS WARNING LIGHT DOES NOT COME ON 
        VSC warning light circuit VSC WARNING LIGHT DOES NOT COME ON 
  7. MASTER CYLINDER PRESSURE SENSOR CHECK (WHEN USING SST CHECK WIRE): 
    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.
      Fig 7: Identifying Blinking Pattern - TEST MODE
      G05241620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the ABS warning light stays on for 3 seconds.

      HINT:

      • At this time, the ABS warning light stays on for 3 seconds.
      • While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf) or more.
      • The ABS warning light comes on for 3 seconds every time the brake pedal operation specified in the previous step is performed.
      • If master cylinder pressure sensor check cannot be completed, do not depress the brake pedal frequently. It may further reduce vacuum and make the sensor check difficult to complete.
      • If the vacuum is insufficient, master cylinder pressure sensor check may not be completed. In this case, idle the engine to get enough vacuum.
      • If the brake pedal is depressed while the engine is off, vacuum may become insufficient and the BRL may come on. (It runs the motor and performs incorrect control.)
  8. SPEED SENSOR CHECK (WHEN USING SST CHECK WIRE): 
    1. Check the speed sensor signal.
      1. Drive the vehicle straight ahead. Drive the vehicle at a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off.

        HINT:

        The sensor check may not be completed if wheel spin occurs, or if the steering wheel is turned during this check.

    2. Stop the vehicle.
      NOTE:
      • Before performing the speed sensor signal check, complete the deceleration 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, if 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.

  9. YAW RATE SENSOR CHECK (WHEN USING SST CHECK WIRE): 
    1. Check the zero point of the yaw rate sensor.
      1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
    2. Check the output of the yaw rate sensor.
      1. Move the shift lever to the D position, drive the vehicle at a speed of approximately 3 mph (5 km/h), and 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.

        HINT:

        • If the skid control buzzer sounds, the signal check has been 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 yet, 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.
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