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System Description

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. DRIVING MODE SWITCHING PATTERN 
    Fig 1: Identifying Driving Mode Switching Pattern
    G05159066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. 2WD TO 4WD HIGH SWITCHING CONTROL (Pattern A) 
    1. CHANGE 4WD CONTROL SWITCH FROM 2WD TO 4H 
    2. 2WD-4WD TRANSFER SHIFT ACTUATOR MOTOR IS OPERATED 
      Fig 2: Example Amperage Waveform Chart
      G05159067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Vehicle speed judgment.

        HINT:

        When the vehicle speed is 100 km/h (62 mph) or more, vehicle speed limit violation control is performed.

      2. 2WD to 4WD HIGH switching vehicle speed limit violation control
        VEHICLE SPEED LIMIT VIOLATION CONTROL

        Control
        • Motor operation prohibited
        • 4HI indicator light blinks at 0.5 seconds intervals
        • Warning buzzer sounds at 0.5 seconds intervals
        Release of Control 4WD control switch: 2WD
    3. 4WD DETECTION SWITCH IS TURNED ON 

      Result 

      4WD DETECTION SWITCH RESULT REFERENCE

      Condition Proceed to
      After 4WD control switch operation, detection switch turns ON within 10 seconds A
      After 4WD control switch operation, detection switch does not turn ON even after 10 seconds have passed B

      B:  Go to step  7

      A: Go to next step. 

    4. A.D.D. ACTUATOR MOTOR IS OPERATED 

      HINT:

      When switching the A.D.D. actuator motor, the rotation difference limit violation control operates when either of the following occurs: 1) there is a difference in the rotation of the front wheels and rear wheels; or 2) there is a difference in the rotation of the front left wheel and front right wheel.

      1. Rotation difference limit violation control
        A.D.D. ACTUATOR MOTOR ROTATION DIFFERENCE LIMIT VIOLATION CONTROL

        Control
        • A.D.D. actuator motor operation prohibited
        • Warning buzzer sounds once (0.5 seconds on, 0.5 seconds off)
        Release of Control
        • Difference in rotation of front wheels and rear wheels: Less than 21.15 km/h (13.1 mph)
        • Difference in rotation of front left wheel and front right wheel: Less than 5.5 km/h (3.4 mph)
    5. A.D.D. ACTUATOR IS LOCKED (A.D.D. DETECTION SWITCH IS TURNED ON) 

      HINT:

      If the A.D.D. actuator motor is performing the switch from 2WD to 4WD and then the 4WD control switch is returned to 2WD, the 2WD switching operation is started after the 2WD to 4WD switch completion.

    6. 4HI INDICATOR LIGHT COMES ON 
      1. The 4HI indicator light comes on when the 2WD to 4WD HIGH switch is complete.

        HINT:

        If the 4WD control switch is changed to 4L before the 4WD HIGH switch completion, switch prohibition control is performed.

        1. Switch prohibition control
          4HI INDICATOR LIGHT SWITCH PROHIBITION CONTROL

          Control
          • 4LO indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          Release of Control 4WD control switch: Changed to position other than 4L

      NEXT: END 

    7. 4WD HIGH TO 2WD RETURN CONTROL IS PERFORMED 
      1. 4WD HIGH to 2WD return control
        4WD HIGH TO 2WD RETURN CONTROL

        Control
        • 4HI indicator light blinks at 0.5 seconds intervals
        • Switches to 2WD
        Release of Control When 2WD switch completed
        NOTE:
        • When the return control is completed, the 4WD control switch is in the 4H position but the vehicle is in the 2WD state, and this inconsistency causes the 4HI indicator light to blink at 0.2 seconds intervals. Changing the 4WD control switch to the 2WD position stops the blinking.
        • When the 4HI indicator light blinks at 0.2 seconds intervals, the system is malfunctioning. Refer to the PROBLEM SYMPTOMS TABLE  .

      NEXT: END 

  3. 4WD HIGH TO 2WD SWITCHING CONTROL (Pattern B) 
    1. CHANGE 4WD CONTROL SWITCH FROM 4H TO 2WD 
    2. 2WD-4WD TRANSFER SHIFT ACTUATOR MOTOR IS OPERATED 
      1. Control is possible when driving at less than 100 km/h (62 mph).

        HINT:

        When the vehicle speed is 100 km/h (62 mph) or more, vehicle speed limit violation control is performed.

        1. 4WD HIGH to 2WD switching vehicle speed limit violation control
          4WD HIGH TO 2WD SWITCHING VEHICLE SPEED LIMIT VIOLATION CONTROL

          Control
          • Motor operation prohibited
          • 4HI indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          Release of Control 4WD control switch: 4H
    3. 4WD DETECTION SWITCH IS TURNED OFF 
    4. A.D.D. ACTUATOR BECOMES FREE (A.D.D. DETECTION SWITCH IS TURNED OFF) 

      HINT:

      If the A.D.D. actuator motor is performing the switch from 4WD to 2WD and then the 4WD control switch is returned to 4H, the 4WD switching operation is started after the 4WD to 2WD switch completion.

    5. 4HI INDICATOR LIGHT TURNS OFF 
      1. The 4HI indicator light turns off when the 4WD HIGH to 2WD switch is complete.

        HINT:

        If the 4WD control switch is changed to 4L before the 2WD switch completion, switch prohibition control is performed.

        1. Switch prohibition control
          4HI INDICATOR LIGHT SWITCH PROHIBITION CONTROL

          Control
          • 4LO indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          Release of Control 4WD control switch: Changed to position other than 4L

      NEXT: END 

  4. 4WD HIGH TO 4WD LOW SWITCHING CONTROL (Pattern C) 
    1. CHANGE 4WD CONTROL SWITCH FROM 4H TO 4L 
    2. HIGH-LOW TRANSFER SHIFT ACTUATOR MOTOR IS OPERATED 
      1. The high-low transfer shift actuator motor operates when all of the following conditions are met: 1) the vehicle speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

        HINT:

        When the conditions are not met, the 4WD HIGH to 4WD LOW switching violation control operates.

        1. 4WD HIGH to 4WD LOW switching violation control (if violation occurs after high-low transfer shift actuator motor operation has started)
          4WD HIGH TO 4WD LOW SWITCHING VIOLATION CONTROL

          Control
          • 4LO indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          • Actuator fork is in neutral position (driving is impossible)
          Release of Control Vehicle speed is less than 5 km/h (3 mph) and shift lever is on N (after release of control, warning buzzer stops and 4LO indicator light blinks at 0.5 seconds intervals until 4WD LOW switch completion)
        2. 4WD HIGH to 4WD LOW switching violation control (if violation occurs before high-low transfer shift actuator motor operation has started)
          4WD HIGH TO 4WD LOW SWITCHING VIOLATION CONTROL

          Control
          • 4LO indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          • Motor operation prohibited
          Release of Control Vehicle speed is less than 5 km/h (3 mph) and shift lever is on N (after release of control, warning buzzer stops and 4LO indicator light blinks at 0.5 seconds intervals until 4WD LOW switch completion) 4WD control switch is changed to 4H or 2WD (switching operation occurs depending on switch position)
    3. ACTUATOR LOW IS DETECTED 

      Result 

      ACTUATOR LOW RESULT REFERENCE

      Condition Proceed to
      After 4WD control switch operation, ACTUATOR LOW detection occurs within 3 seconds A
      After 4WD control switch operation, ACTUATOR LOW detection does not occur even after 3 seconds have passed B

      HINT:

      After 4WD control switch operation, if ACTUATOR LOW is not detected even after 3 seconds have passed, the 4WD HIGH to 4WD LOW return control is performed.

      B:  Go to step  5

      A: Go to next step. 

    4. 4LO INDICATOR LIGHT TURNS ON 
      1. The 4LO indicator light turns on when the 4WD HIGH to 4WD LOW switch is complete.

      NEXT: END 

    5. 4WD LOW TO 4WD HIGH RETURN CONTROL IS PERFORMED 
      1. 4WD LOW to 4WD HIGH return control
        4WD LOW TO 4WD HIGH RETURN CONTROL

        Control
        • 4LO indicator light blinks at 0.5 seconds intervals
        • 4WD LOW side operation is stopped, and operation is switched to 4WD HIGH side
        Release of Control When 4WD HIGH switch completed
        NOTE:
        • When the return control is completed, the 4WD control switch is in the 4L position but the vehicle is in the 4WD HIGH state, and this inconsistency causes the 4LO indicator light to blink at 0.2 seconds intervals. Changing the 4WD control switch to the 4H position stops the blinking. (The 4HI indicator light remains illuminated.)
        • When the 4LO indicator light blinks at 0.2 seconds intervals, the system is malfunctioning. Refer to the PROBLEM SYMPTOMS TABLE  .

        HINT:

        The 4WD LOW to 4WD HIGH switching violation control operates when all of the following conditions are met during 4WD LOW to 4WD HIGH return control: 1) the vehicle speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

      NEXT: END 

  5. 4WD LOW TO 4WD HIGH SWITCHING CONTROL (Pattern D) 
    1. CHANGE 4WD CONTROL SWITCH FROM 4L TO 4H 
    2. HIGH-LOW TRANSFER SHIFT ACTUATOR MOTOR IS OPERATED 
      1. The high-low transfer shift actuator motor operates when all of the following conditions are met: 1) the vehicle speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

        HINT:

        When the conditions are not met, the 4WD LOW to 4WD HIGH switching violation control operates.

        1. 4WD LOW to 4WD HIGH switching violation control (if violation occurs after high-low transfer shift actuator motor operation has started)
          4WD LOW TO 4WD HIGH SWITCHING VIOLATION CONTROL

          Control
          • 4LO indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          • Actuator fork is in neutral position (driving is impossible)
          Release of Control Vehicle speed is less than 5 km/h (3 mph) and shift lever is on N (after release of control, warning buzzer stops and 4LO indicator light blinks at 0.5 seconds intervals until 4WD HIGH switch completion)
        2. 4WD LOW to 4WD HIGH switching violation control (if violation occurs before high-low transfer shift actuator motor operation has started)
          4WD LOW TO 4WD HIGH SWITCHING VIOLATION CONTROL

          Control
          • 4LO indicator light blinks at 0.5 seconds intervals
          • Warning buzzer sounds at 0.5 seconds intervals
          • Motor operation prohibited
          Release of Control Vehicle speed is less than 5 km/h (3 mph) and shift lever is on N (after release of control, warning buzzer stops and 4LO indicator light blinks at 0.5 seconds intervals until 4WD HIGH switch completion) 4WD control switch is changed to 4L (switching operation occurs depending on switch position)
    3. ACTUATOR HIGH IS DETECTED 

      Result 

      ACTUATOR HIGH RESULT REFERENCE

      Condition Proceed to
      After 4WD control switch operation, ACTUATOR HIGH detection occurs within 3 seconds A
      After 4WD control switch operation, ACTUATOR HIGH detection does not occur even after 3 seconds have passed B

      HINT:

      After 4WD control switch operation, if ACTUATOR HIGH is not detected even after 3 seconds have passed, the 4WD LOW to 4WD HIGH return control is performed.

      B:  Go to step  5

      A: Go to next step. 

    4. 4HI INDICATOR LIGHT ILLUMINATES 
      1. The 4HI indicator light illuminates when the 4WD LOW to 4WD HIGH switch is complete.

      NEXT: END 

    5. 4WD HIGH TO 4WD LOW RETURN CONTROL IS PERFORMED 
      1. 4WD HIGH to 4WD LOW return control
        4WD HIGH TO 4WD LOW RETURN CONTROL

        Control
        • 4LO Indicator light blinks at 0.5 seconds intervals
        • 4WD HIGH side operation is stopped, and operation is switched to 4WD LOW side
        Release of Control
        • When 4WD LOW switch completed
        NOTE:
        • When the return control is completed, the 4WD control switch is in the 4H position but the vehicle is in the 4WD LOW state, and this inconsistency causes the 4LO indicator light to blink at 0.2 seconds intervals. Changing the 4WD control switch to the 4L position stops the blinking of the 4LO indicator light and causes it to illuminate.
        • When the 4LO indicator light blinks at 0.2 seconds intervals, the system is malfunctioning. Refer to the PROBLEM SYMPTOMS TABLE  .

        HINT:

        The 4WD HIGH to 4WD LOW switching violation control operates when all of the following conditions are met during 4WD HIGH to 4WD LOW return control: 1) the vehicle speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

      NEXT: END 

  6. 4WD LOW TO 2WD SWITCHING CONTROL (Pattern E) 

    HINT:

    The switching operation occurs in the following order: 1) 4WD LOW to 4WD HIGH switching control; 2) 4WD HIGH to 2WD switching control.

  7. INDICATOR LIGHT 
    1. 4HI Indicator Light
      4HI INDICATOR LIGHT CONDITION

      Indicator Condition Vehicle Condition Details [Terminal Name: Switch Condition]
      Illuminates 4WD HIGH
      • 2WD-4WD transfer shift actuator limit switch 4WD [TL1: OFF, TL3: ON]
      • 2WD-4WD transfer shift actuator 4WD detection switch 4WD [4WD: ON]
      • High-low transfer shift actuator limit switch High [HL1: ON, HL2: OFF, HL3: OFF]
      • High-low transfer shift actuator neutral position switch 4HI [NP: OFF]
      • A.D.D. actuator limit switch Lock [DL1: ON, DL2: OFF]
      • A.D.D. actuator A.D.D. detection switch Lock [ADD: ON]
      During 4WD HIGH to 2WD switching While 2WD-4WD transfer shift actuator and A.D.D. actuator are switching, within 3 seconds of operation of 4WD control switch (4H to 2WD)
      Does not illuminate 2WD
      • 2WD-4WD transfer shift actuator limit switch 2WD [TL1: ON, TL3: OFF]
      • 2WD-4WD transfer shift actuator 4WD detection switch 2WD [4WD: OFF]
      • High-low transfer shift actuator limit switch High [HL1: ON, HL2: OFF, HL3: OFF]
      • High-low transfer shift actuator neutral position switch 4HI [NP: OFF]
      • A.D.D. actuator limit switch Free [DL1: OFF, DL2: ON]
      • A.D.D. actuator A.D.D. detection switch Free [ADD: OFF]
      During 2WD to 4WD HIGH switching While 2WD-4WD transfer shift actuator and A.D.D. actuator are switching, within 3 seconds of operation of 4WD control switch (2WD to 4H)
      4WD LOW
      • 2WD-4WD transfer shift actuator limit switch 4WD [TL1: OFF, TL3: ON]
      • 2WD-4WD transfer shift actuator 4WD detection switch 4WD [4WD: ON]
      • High-low transfer shift actuator limit switch Low [HL1: OFF, HL2: ON, HL3: OFF]
      • High-low transfer shift actuator neutral position switch 4LO [NP: OFF]
      • A.D.D. actuator limit switch Lock [DL1: ON, DL2: OFF]
      • A.D.D. actuator A.D.D. detection switch Lock [ADD: ON]
      During 4WD LOW to 4WD HIGH or 4WD LOW to 2WD switching
      • From change of 4WD control switch from 4L to 4H, until high-low transfer shift actuator change completes
      • From change of 4WD control switch from 4L to 2WD, until high-low transfer shift actuator change completes
      Blinks (ON: 0.5 seconds, OFF: 0.5 seconds) During 2WD to 4WD HIGH or 4WD HIGH to 2WD switching While 2WD-4WD transfer shift actuator and A.D.D. actuator are switching, from 3 seconds or more after operation of 4WD control switch (2WD to 4H or 4H to 2WD) to switch completion
      During 4WD LOW to 2WD return control
      During 4WD LOW to 2WD switching After change of 4WD control switch from 4L to 2WD, from high-low transfer shift actuator switch completion until 2WD-4WD transfer shift actuator and A.D.D. actuator switch completion
      When ignition switch is ON and 4WD control switch is between 2WD and 4H, or 4H and 4L
      Blinks (ON: 0.5 seconds, OFF: 0.5 seconds) Warning buzzer sounds (ON: 0.5 seconds OFF: 0.5 seconds) During 2WD to 4WD HIGH or 4WD HIGH to 2WD switching control violation
      • At ambient temperature and vehicle speed at 100 km/h (62 mph) or more, 2WD to 4WD switching operation is performed
      • With vehicle speed at 100 km/h (62 mph) or more, 4WD to 2WD switching operation is performed
      During A.D.D. actuator switching violation During A.D.D. actuator switching, there is difference in rotation of front wheels and rear wheels or front left and right wheel
      Blinks (ON: 0.2 seconds, OFF: 0.2 seconds) During malfunction
      • During A.D.D. actuator limit switch malfunction
      • During 2WD-4WD transfer shift actuator limit switch malfunction
      • During 2WD to 4WD switching control malfunction
      • During wheel speed signal malfunction
      • During vehicle speed signal malfunction
      From 2WD to 4WD return control switching completion until 4WD control switch is changed to 2WD
    2. 4LO Indicator Light
      4LO INDICATOR LIGHT CONDITION

      Indicator Condition Vehicle Condition Details [Terminal Name: Switch Condition]
      Illuminates 4WD LOW
      • 2WD-4WD transfer shift actuator limit switch 4WD [TL1: OFF, TL3: ON]
      • 2WD-4WD transfer shift actuator 4WD detection switch 4WD [4WD: ON]
      • High-low transfer shift actuator limit switch Low [HL1: OFF, HL2: ON, HL3: OFF]
      • High-low transfer shift actuator neutral position switch 4LO [NP: OFF]
      • A.D.D. actuator limit switch Lock [DL1: ON, DL2: OFF]
      • A.D.D. actuator A.D.D. detection switch Lock [ADD: ON]
      During 4WD LOW to 4WD HIGH switching While High-Low transfer shift actuator is switching, within 3 seconds of operation of 4WD control switch (4L to 4H)
      Does not illuminate 2WD
      • 2WD-4WD transfer shift actuator limit switch 2WD [TL1: ON, TL3: OFF]
      • 2WD-4WD transfer shift actuator 4WD detection switch 2WD [4WD: OFF]
      • High-low transfer shift actuator limit switch High [HL1: ON, HL2: OFF, HL3: OFF]
      • High-low transfer shift actuator neutral position switch 4HI [NP: OFF]
      • A.D.D. actuator limit switch Free [DL1: OFF, DL2: ON]
      • A.D.D. actuator A.D.D. detection switch Free [ADD: OFF]
      During 2WD to 4WD HIGH switching
      4WD HIGH
      • 2WD-4WD transfer shift actuator limit switch 4WD [TL1: OFF, TL3: ON]
      • 2WD-4WD transfer shift actuator 4WD detection switch 4WD [4WD: ON]
      • High-low transfer shift actuator limit switch High [HL1: ON, HL2: OFF, HL3: OFF]
      • High-low transfer shift actuator neutral position switch 4HI [NP: OFF]
      • A.D.D. actuator limit switch Lock [DL1: ON, DL2: OFF]
      • A.D.D. actuator A.D.D. detection switch Lock [ADD: ON]
      During 4WD HIGH to 2WD switching
      During 4WD HIGH to 4WD LOW switching While high-low transfer shift actuator is switching, within 3 seconds of operation of 4WD control switch (4H to 4L)
      Blinks (ON: 0.5 seconds, OFF: 0.5 seconds) During 4WD LOW to 4WD HIGH, or 4WD HIGH to 4WD LOW switching While High-Low transfer shift actuator is switching, from 3 seconds or more after operation of 4WD control switch (4L to 4H or 4H to 4L) to switch completion
      • During 4WD LOW to 4WD HIGH return control
      • During 4WD HIGH to 4WD LOW return control
      When ignition switch is ON and 4WD control switch is between 2WD and 4H, or 4H and 4L
      Blinks (ON: 0.5 seconds, OFF: 0.5 seconds) Warning buzzer sounds (ON: 0.5 seconds OFF: 0.5 seconds) During 4WD LOW to 4WD HIGH or 4WD LOW to 2WD switching control violation
      • With vehicle speed at 5 km/h (3 mph) or more, 4WD HIGH to 4WD LOW or 4WD LOW to 4WD HIGH switching operation is performed
      • With shift lever on position other than N, 4WD HIGH to 4WD LOW or 4WD LOW to 4WD HIGH switching operation is performed
      When 2WD to 4WD HIGH switching is not completed, from when 4WD control switch is accidentally changed to 4L, until 4WD control switch is changed to 4H or 2WD
      Blinks (ON: 0.2 seconds, OFF: 0.2 seconds) During malfunction
      • During High-low transfer shift actuator limit switch malfunction
      • During 4WD HIGH to 4WD LOW switching control malfunction
      • During vehicle speed signal malfunction
      • During shift position P signal malfunction
      • During shift position N signal malfunction
      • During engine speed signal malfunction
      • From 4WD HIGH to 4WD LOW return control completion, until 4WD control switch is changed to 4H or 2WD
      • From 3 seconds after 4WD HIGH to 4WD LOW return control start (shift fork of high-low transfer shift actuator is in neutral position), until 4WD control switch is changed to 4H or 2WD
      • From 4WD LOW to 4WD HIGH return control completion, until 4WD control switch is changed to 4L
      • From 3 seconds after 4WD LOW to 4WD HIGH return control start (shift fork of high-low transfer shift actuator is in neutral position), until 4WD control switch is changed to 4L
      Fig 3: Identifying Switch Condition Chart
      G05159068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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