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Test Mode Procedure

USING SST CHECK WIRE: 

  1. TEST MODE (SIGNAL CHECK) PROCEDURE 

    When having replaced the master cylinder solenoid and/or yaw rate and deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor (see CALIBRATION  ).

    HINT:

    • If the ignition switch is turned from the ON to the ACC or LOCK position 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 test mode (SIGNAL CHECK) function. By performing the test mode (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.
    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 & CG Of DLC3
      G02963637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check that the ABS and VSC TRAC warning lights blink in test mode.

      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.

      TROUBLE AREA REFERENCE TABLE

      Trouble Area Reference
      TS and CG terminal circuit TS AND CG TERMINAL CIRCUIT 
      ABS warning light circuit ABS WARNING LIGHT CIRCUIT (REMAINS ON)  ; ABS WARNING LIGHT CIRCUIT (DOES NOT COME ON) 
      VSC TRAC warning light circuit VSC TRAC WARNING LIGHT CIRCUIT (REMAINS ON)  ; VSC TRAC WARNING LIGHT CIRCUIT (DOES NOT COME ON) 
      Fig 2: ABS & VSC TRAC Warning Lights Blinking Pattern In Test Mode
      G02963638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Start the engine.
    7. Using a check wire, perform 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 sensor and DAC operation switch) signal checks in test mode (ABS sensor: refer to step  2 to  7, VSC sensor: refer to step  8 to  10).
  2. DECELERATION SENSOR SIGNAL CHECK 
    1. Check that the ABS 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 3: ABS Warning Light Blinking Pattern In Test Mode (1 Of 5)
      G02963639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. MASTER CYLINDER PRESSURE SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    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.

    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, 22 lbf) or more.
    • The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
      Fig 4: ABS Warning Light Blinking Pattern In Test Mode (2 Of 5)
      G02963640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CENTER DIFF. LOCK DETECTION SWITCH SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    2. Check the center diff. lock switch.
      1. Push the center diff. lock switch on to lock the center differential.
      2. Push the center diff. lock switch off to unlock the center differential.
        Fig 5: ABS Warning Light Blinking Pattern In Test Mode (3 Of 5)
        G02963641Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. L4 DETECTION SWITCH SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    2. Check the transfer indicator (L4) switch.
      1. Turn the H-L switch to the L position to put the vehicle in L4 mode.
      2. Turn the H-L switch to the H position to put the vehicle in H4 mode.
        Fig 6: ABS Warning Light Blinking Pattern In Test Mode (4 Of 5)
        G02963642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. SPEED SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    2. 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 complete if the vehicle speed is 28 mph (45 km/h) or more.

        Fig 7: ABS Warning Light Blinking Pattern In Test Mode (5 Of 5)
        G02963643Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the forward signal.
      1. Drive the vehicle straight forward.

        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.

    4. Stop the vehicle.
    NOTE:
    • Before performing the speed sensor signal check, complete the deceleration sensor, master cylinder pressure sensor, center diff. lock detection switch 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), 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  11).
      • 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.)
        Fig 8: Locating Terminals TC & CG Of DLC3
        G02963644Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
        Fig 9: Identifying Trouble Code (Example Code 72 & 76) Blinking Pattern
        G02963645Courtesy 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 in test mode.
    2. Check the zero point voltage of the yaw rate sensor.
      1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
    3. Check the output of the yaw rate sensor and the direction of the steering angle sensor.
      Fig 10: Identifying VSC TRAC Warning Light Blinking Pattern In Test Mode
      G02963646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. 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 until the vehicle makes a 180° turn.
      2. Stop the vehicle and shift 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 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 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.
      Fig 11: Identifying Terminals TC & CG Of DLC3
      G02963647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. DAC OPERATION SWITCH SIGNAL CHECK 
    1. Check that the VSC TRAC warning light is blinking in test mode.
    2. Check the DAC switch.
      1. Push the DAC switch on.
      2. Push the DAC switch off.
        Fig 12: Identifying VSC TRAC Warning Light Blinking Pattern In Test Mode
        G02963648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. 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.

      HINT:

      • See the list of DTC (refer to step  11).
      • 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 first.
        Fig 13: Identifying Terminals TC & CG Of DLC3
        G02963649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 14: Identifying Trouble Code (Example Code 71 & 72) Blinking Pattern
        G02963650Courtesy 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.
    4. Turn the ignition switch to the ON position.
  11. DTC OF SIGNAL CHECK FUNCTION 

    ABS sensor: 

    Fig 15: ABS Sensor Signal Check Function DTC Table
    G02963651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    VSC sensor: 

    VSC Sensor Signal Check Function DTC

    Code No. (Reference) Diagnosis Trouble Area
    C0371/71 (DTC C1232/32, C1234/34, C1243/43, C1244/44, C1245/45, C1381/97: MALFUNCTION IN DECELERATION SENSOR; MALFUNCTION IN YAW RATE SENSOR; MALFUNCTION IN DECELERATION SENSOR (CONSTANT OUTPUT); OPEN OR SHORT CIRCUIT IN DECELERATION SENSOR CIRCUIT; MALFUNCTION IN DECELERATION SENSOR; MALFUNCTION IN POWER SUPPLY VOLTAGE OF YAW/DECELERATION SENSOR  ) Yaw rate sensor output signal malfunction Yaw rate and deceleration sensor
    C1379/74 (DAC INDICATOR LIGHT CIRCUIT (REMAINS ON) , DAC INDICATOR LIGHT CIRCUIT (DOES NOT COME ON)  ) Malfunction in DAC operation switch DAC switch

    HINT:

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

    USING HAND-HELD TESTER: 

  12. TEST MODE (SIGNAL CHECK) PROCEDURE 

    When having replaced the master cylinder solenoid and/or yaw rate and deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor (see CALIBRATION  ).

    HINT:

    • If the ignition switch is turned from the ON to the ACC or LOCK position 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 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.
    3. Connect the hand-held tester to the DLC3.
    4. Turn the ignition switch to the ON position.
      Fig 16: Connecting Hand-Held Tester To DLC3
      G02963652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Operate the hand-held tester in test mode (SIGNAL CHECK).

      HINT:

      Refer to the hand-held tester operator's manual for further details.

      Fig 17: Identifying Display Signal Check Screen
      G02963653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Check that the ABS and VSC TRAC warning lights blink in test mode.

      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.

      TROUBLE AREA REFERENCE TABLE

      Trouble Area Reference
      TS and CG terminal circuit TS AND CG TERMINAL CIRCUIT 
      ABS warning light ABS WARNING LIGHT CIRCUIT (REMAINS ON)  ; ABS WARNING LIGHT CIRCUIT (DOES NOT COME ON) 
      VSC TRAC warning light VSC TRAC WARNING LIGHT CIRCUIT (REMAINS ON)  ; VSC TRAC WARNING LIGHT CIRCUIT (DOES NOT COME ON) 
      Fig 18: ABS Warning Lights Blinking Pattern In Test Mode (1 Of 6)
      G02963654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Start the engine.
    8. Using the hand-held tester, perform 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 sensor and DAC operation switch) signal checks in test mode (ABS sensor: refer to step  13 to  18, VSC sensor: refer to step  19 to  21).
  13. DECELERATION SENSOR SIGNAL CHECK 
    1. Check that the ABS 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 19: ABS Warning Lights Blinking Pattern In Test Mode (2 Of 6)
      G02963655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. MASTER CYLINDER PRESSURE SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    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.

    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, 22 lbf) or more.
    • The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
      Fig 20: ABS Warning Lights Blinking Pattern In Test Mode (3 Of 6)
      G02963656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. CENTER DIFF. LOCK DETECTION SWITCH SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    2. Check the center diff. lock switch.
      1. Push the center diff. lock switch on to lock the center differential.
      2. Push the center diff. lock switch off to unlock the center differential.
        Fig 21: ABS Warning Lights Blinking Pattern In Test Mode (4 Of 6)
        G02963657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. L4 DETECTION SWITCH SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    2. Check the transfer indicator (L4) switch.
      1. Turn the H-L switch to the L position to put the vehicle in L4 mode.
      2. Turn the H-L switch to the H position to put the vehicle in H4 mode.
        Fig 22: ABS Warning Lights Blinking Pattern In Test Mode (5 Of 6)
        G02963658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. SPEED SENSOR SIGNAL CHECK 
    1. Check that the ABS warning light is blinking in test mode.
    2. 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 complete if the vehicle speed is 28 mph (45 km/h) or more.

      Fig 23: ABS Warning Lights Blinking Pattern In Test Mode (6 Of 6)
      G02963659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the forward signal.
      1. Drive the vehicle straight forward.

      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.

    4. Stop the vehicle.
      NOTE:
      • Before performing the speed sensor signal check, complete the deceleration sensor, master cylinder pressure sensor, center diff. lock detection switch 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.

  18. 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  22.).
  19. YAW RATE SENSOR SIGNAL CHECK 
    1. Check that the VSC TRAC warning light is blinking in test mode.
      Fig 24: VSC TRAC Warning Light Blinking Pattern In Test Mode
      G02963660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the zero point voltage of the yaw rate sensor.
      1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
    3. Check the output of the yaw rate sensor and the direction of the steering angle sensor.
      1. 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 until the vehicle makes 180° turn.
      2. Stop the vehicle and shift 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 is completed normally.
      Fig 25: Vehicle Driving Position
      G02963661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • If the skid control buzzer does not sound, check the skid control buzzer circuit (see SKID CONTROL BUZZER CIRCUIT  ), then perform the signal check again.
    • If the skid control 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.
  20. DAC OPERATION SWITCH SIGNAL CHECK 
    1. Check that the VSC TRAC warning light is blinking in test mode.
      Fig 26: VSC TRAC Warning Light Blinking Pattern In Test Mode
      G02963662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the DAC switch.
      1. Push the DAC switch on.
      2. Push the DAC switch off.
  21. 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 step  22).
  22. DTC OF SIGNAL CHECK FUNCTION 

    ABS sensor: 

    Fig 27: ABS Sensor Signal Check Function DTC Table
    G02963663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    VSC sensor: 

    VSC SENSOR SIGNAL CHECK FUNCTION DTC TABLE

    Code No.
    (Reference)    		 Diagnosis Trouble Area
    C0371/71 (DTC C1232/32, C1234/34, C1243/43, C1244/44, C1245/45, C1381/97: MALFUNCTION IN DECELERATION SENSOR; MALFUNCTION IN YAW RATE SENSOR; MALFUNCTION IN DECELERATION SENSOR (CONSTANT OUTPUT); OPEN OR SHORT CIRCUIT IN DECELERATION SENSOR CIRCUIT; MALFUNCTION IN DECELERATION SENSOR; MALFUNCTION IN POWER SUPPLY VOLTAGE OF YAW/DECELERATION SENSOR  ) Yaw rate sensor output signal malfunction Yaw rate and deceleration sensor
    C1379/74 (DAC INDICATOR LIGHT CIRCUIT (REMAINS ON) , DAC INDICATOR LIGHT CIRCUIT (DOES NOT COME ON)  ) Malfunction in DAC operation switch DAC switch

    HINT:

    The codes in VSC SENSOR SIGNAL CHECK FUNCTION DTC TABLE  are output only in test mode (signal check).

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