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Home >> Toyota >> 2004 >> Tundra Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 471 (Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics)) >> Abs With EBD & BA & TRAC & VSC System >> Test Mode Procedure

Test Mode Procedure

WARNING: This page is about a different car, the 2006 Toyota Tundra and 2005 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

USING SST CHECK WIRE: 

  1. TEST MODE (SIGNAL CHECK) PROCEDURE 

    When having replaced the master cylinder solenoid (skid control ECU) and/or yaw rate & deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor.

    HINT:

    • If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTCs of the signal check function will be erased.
    • During test mode, the skid control ECU records all DTCs of the signal check function. By performing the signal check, the codes are erased if normality is confirmed. The codes left over are the codes where an abnormality was found.
    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 (A/T), or apply the parking brake (M/T).
    3. Using SST, connect terminals TS and CG of the DLC3.

      SST 09843-18040

    4. Turn the ignition switch to the ON position.
      Fig 1: Identifying Terminals TS And CG Of DLC3
      G02642896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check that the ABS and VSC TRAC warning lights blink as shown in the illustration.

      HINT:

      If the ABS and VSC TRAC warning lights do not blink, inspect the TS and CG terminal circuit and the ABS and VSC TRAC warning light circuits.

      TROUBLESHOOTING REFERENCE

      Trouble Area See Example
      TS and CG terminal circuit Figure
      ABS warning light circuit Figure and ABS Warning Light Circuit (Does not light up) 
      VSC TRAC warning light circuit Figure and VSC TRAC Warning Light Circuit (Does not light up) 
      Fig 2: ABS And VSC TRAC Warning Lights Blinking Pattern
      G02642897Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Start the engine.
    7. Activate the ABS sensor (deceleration sensor, master cylinder pressure sensor, center diff. lock detection switch, L4 detection switch and speed sensor) and VSC sensor (yaw rate & deceleration sensor) in test mode (SIGNAL CHECK) using a check wire (ABS sensor: refer to step 2 to 7, VSC sensor: refer to step 8 to 9).
  2. DECELERATION SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
    Fig 3: ABS Warning Light Blinking Pattern (1 Of 5)
    G02642898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. MASTER CYLINDER PRESSURE SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. 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 4: ABS Warning Light Blinking Pattern (2 Of 5)
    G02642899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 brake pedal operation above is performed.
  4. DETECTION (4WD) SWITCH SIGNAL CHECK (4WD) 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Check the detection (4WD) switch.
      1. Push the touch select 2-4 switch on to put the vehicle in 4WD mode.
      2. Push the touch select 2-4 switch off to put the vehicle in 2WD mode.
    Fig 5: ABS Warning Light Blinking Pattern (3 Of 5)
    G02642900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. DETECTION (L4) SWITCH SIGNAL CHECK (4WD) 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Check the detection (L4) switch.
      1. Turn the touch select HI-LO switch to the L position to put the vehicle in L4 mode.
      2. Turn the touch select HI-LO switch to the H position to put the vehicle in H4 mode.
    Fig 6: ABS Warning Light Blinking Pattern (4 Of 5)
    G02642901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Move the vehicle either a little forward or backward to engage in the L4 position.

  6. SPEED SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Check the speed sensor signal.
      1. Drive the vehicle straight forward.
      Fig 7: ABS Warning Light Blinking Pattern (5 Of 5)
      G02642902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 signal check may not be completed if the vehicle has its wheels spun or the steering wheel turned during this check.

    3. Stop the vehicle.
    NOTE:
    • Before performing the speed sensor signal check, complete the deceleration sensor, master cylinder pressure sensor, and L4 detection switch signal 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 the vehicle speed exceeds 50 mph (80 km/h), a signal check code will be stored again. Decelerate or stop 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.

  7. READ DTC OF ABS SENSOR 
    1. Using SST, connect terminals TC and CG of the DLC3.

      SST 09843-18040

    2. Read the number of blinks of the ABS warning light.

      HINT:

      • See the list of DTC (refer to step  10).
      • If every sensor is normal, the normal system code is output. (A cycle of 0.25 second ON and 0.25 second OFF is repeated.)
      • If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed 1 st.
      Fig 8: Identifying Terminals TC And CG Of DLC3
      G02642903Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 9: Trouble Code (Example Codes 72 And 76) Blinking Pattern
      G02642904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. After the check, disconnect the SST from terminals TC and CG of the DLC3.
  8. YAW RATE SENSOR SIGNAL CHECK 
    1. Check that the VSC TRAC warning light is blinking as shown in the illustration.
    2. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
      Fig 10: VSC TRAC Warning Light Blinking Pattern
      G02642905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Shift the shift lever to the D position and drive the vehicle at a vehicle speed of approx. 3 mph (5 km/h), turn the steering wheel either to the left or right 90° or more, and turn the vehicle through 180 degrees.
    4. AT: Stop the vehicle, check that the shift lever is in the P position, and then apply the parking brake.

      MT: Stop the vehicle, check that the shift lever is in neutral, and then apply the parking brake.

    5. Check that the skid control (VSC warning) buzzer sounds for 3 seconds.
    Fig 11: Identifying Start And End Positions Of Vehicle
    G02642906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • If the skid control (VSC warning) buzzer sounds, the signal check is completed normally.
    • If the skid control (VSC warning) buzzer does not sound, check the skid control buzzer circuit (see VSC Warning Buzzer Circuit  ), then perform the signal check again.
    • If the skid control (VSC warning) buzzer still won't sound, there is a malfunction in the yaw rate sensor, so check the DTC.
    • Drive the vehicle in a 180° circle. 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.
  9. READ DTC OF VSC SENSOR 
    1. Using SST, connect terminals TC and CG of the DLC3.

      SST 09843-18040

    2. Read the number of blinks of the VSC TRAC warning light.
      Fig 12: Identifying Terminals TC And CG Of DLC3
      G02642907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • See the list of DTC (refer to step  10).
      • If every sensor is normal, the normal system code is output. (A cycle of 0.25 second ON and 0.25 second OFF is repeated.)
      • If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed 1 st.
      Fig 13: Trouble Code (Example Codes 71 And 72) Blinking Pattern
      G02642908Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. After performing the check, disconnect the SST from terminals TS and CG, TC and CG of the DLC3 and turn the ignition switch off.
  10. DTC of ABS sensor signal check function: 
    Fig 14: DTC Of ABS Sensor Signal Check Function
    G02642909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    DTC of VSC sensor signal check function: 

    DTC OF VSC SENSOR SIGNAL CHECK FUNCTION

    Code No. Diagnosis Trouble Area
    C0371/71 Yaw rate sensor output signal malfunction Yaw rate & deceleration sensor

    HINT:

    The codes in this table are output only in test mode (signal check).

    USING HAND-HELD TESTER: 

  11. TEST MODE (SIGNAL CHECK) PROCEDURE 

    When having replaced the master cylinder solenoid (skid control ECU) and/or yaw rate & deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor.

    HINT:

    • If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTCs of the signal check function will be erased.
    • During test mode, the skid control ECU records all DTCs of signal check function. By performing the signal check, the codes are erased if normality is confirmed. The codes left over are the codes where an abnormality was found.
    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 (A/T), or apply the parking brake (M/T).
    3. Connect the hand-held tester to the DLC3.
    4. Turn the ignition switch to the ON position.
      Fig 15: Connecting Hand-Held Tester To DLC3
      G02642910Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Change the ECU to test mode with the hand-held tester. Enter the following menus: DIAGNOSTIC / OBD/MOBD / select vehicle / ABS/VSC / SIGNAL CHECK.
      Fig 16: Changing Procedure Of ECU To Test Mode With Hand-Held Tester
      G02642911Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check that the ABS and VSC TRAC warning lights blink as shown in the illustration.

      HINT:

      If the ABS and VSC TRAC warning lights do not blink, inspect the TS and CG terminal circuit, and the ABS and VSC TRAC warning light circuits.

      TROUBLESHOOTING REFERENCE

      Trouble Area See Example
      TS and CG terminal circuit Figure
      ABS warning light Figure and ABS Warning Light Circuit (Does not light up) 
      VSC TRAC warning light Figure and VSC TRAC Warning Light Circuit (Does not light up) 
      Fig 17: ABS And VSC TRAC Warning Lights Blinking Pattern
      G02642912Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Start the engine.
    7. Activate the ABS sensor (deceleration sensor, master cylinder pressure sensor, center diff. lock detection switch, L4 detection switch and speed sensor) and VSC sensor (yaw rate & deceleration sensor) in test mode (SIGNAL CHECK) using the hand-held tester (ABS sensor: refer to step 12 to 17, VSC sensor: refer to step 18 to 19).
  12. DECELERATION SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
    Fig 18: ABS Warning Light Blinking Pattern (1 Of 5)
    G02642913Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. MASTER CYLINDER PRESSURE SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. 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 19: ABS Warning Light Blinking Pattern (2 Of 5)
    G02642914Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 above is performed.
  14. DETECTION (4WD) SWITCH SIGNAL CHECK (4WD) 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Check the detection (4WD) switch.
      1. Push the touch select 2-4 switch on to put the vehicle in 4WD mode.
      2. Push the touch select 2-4 switch off to put the vehicle in 2WD mode.
    Fig 20: ABS Warning Light Blinking Pattern (3 Of 5)
    G02642915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. DETECTION (L4) SWITCH SIGNAL CHECK (4WD) 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Check the detection (L4) switch.
      1. Turn the touch select HI-LO switch to the L position to put the vehicle in L4 mode.
      2. Turn the touch select HI-LO switch to the H position to put the vehicle in H4 mode.
    Fig 21: ABS Warning Light Blinking Pattern (4 Of 5)
    G02642916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Move the vehicle either a little forward or backward to engage in the L4 position.

  16. SPEED SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking as shown in the illustration.
    2. Check the speed sensor signal.
      1. Drive the vehicle straight forward.
      Fig 22: ABS Warning Light Blinking Pattern (5 Of 5)
      G02642917Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 signal check may not be completed if the vehicle has its wheels spun or the steering wheel turned during this check.

    3. Stop the vehicle.
    NOTE:
    • Before performing the speed sensor signal check, complete the deceleration sensor, master cylinder pressure sensor, and L4 detection switch signal 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 the vehicle speed exceeds 50 mph (80 km/h), a signal check code will be stored again. Decelerate or stop 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.

  17. READ DTC OF ABS SENSOR 
    1. Read the DTC(s) by following the tester screen.

    HINT:

    • Refer to the hand-held tester operator's manual for further details.
    • See the list of DTC (refer to step  20).
  18. YAW RATE SENSOR SIGNAL CHECK 
    1. Check that the VSC TRAC warning light is blinking in test mode.
    2. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
      Fig 23: VSC TRAC Warning Light Blinking Pattern
      G02642918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Shift the shift lever to the D position and drive the vehicle at a vehicle speed of approx. 3 mph (5 km/h), turn the steering wheel either to left or right 90° or more, and turn the vehicle through 180 degrees.
    4. AT: Stop the vehicle, check that the shift lever is in the P position, and then apply the parking brake.

      MT: Stop the vehicle, check that the shift lever is in neutral, and then apply the parking brake.

    5. Check that the skid control (VSC warning) buzzer sounds for 3 seconds.
    Fig 24: Identifying Vehicle Start And End Position
    G02642919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • If the skid control (VSC warning) buzzer sounds, the signal check is completed normally.
    • If the skid control (VSC warning) buzzer does not sound, check the skid control buzzer circuit (see VSC Warning Buzzer Circuit  ), then perform the signal check again.
    • If the skid control (VSC warning) buzzer still won't sound, there is a malfunction in the yaw rate sensor, so check the DTC.
    • Drive the vehicle in a 180° circle. 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.
  19. READ DTC OF VSC SENSOR 
    1. Read the DTC(s) by following the tester screen.

    HINT:

    • Refer to the hand-held tester operator's manual for further details.
    • See the list of DTC (refer to the step  20).
  20. DTC of ABS sensor signal check function: 
    Fig 25: DTC Of ABS Sensor Signal Check Function
    G02642920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    DTC of VSC sensor signal check function: 

    DTC OF VSC SENSOR SIGNAL CHECK FUNCTION

    Code No. Diagnosis Trouble Area
    C0371/71 Yaw rate sensor output signal malfunction Yaw rate & deceleration sensor

    HINT:

    The codes in this table are output only in test mode (signal check).

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