When Testing Brakes, Speedometer, Etc.

Before starting any such servicing or test, be sure to check the flowing items: 

• Center differential mode position (FREE or LOCK). See Figure.
• Vehicle skid control (VSC) system (with or without):

  If the vehicle is equipped with the system, the slip indicator light, the VSC/TRAC indicator light and the VSC OFF indicator light come on with the ignition key turned to "ON". They will go OFF after about a few seconds. See Fig 1.

  Fig 1: Locating Slip, VSC/TRAC & VSC OFF Indicator Lights

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
• Whether wheels should be touching the ground or jacked up.
• Transmission gear position ("N" position).
• Transfer gear position ("H" or "L" position).
• Maximum testing vehicle speed.
• Maximum testing time.

W/O Vehicle Skid Control (VSC) system  :

When the transfer select lever is put in "L" position, the center differential is put in LOCK condition regardless of the position of the center differential lock switch.

1. When carrying out any kind of servicing or testing on a Full-time 4wd in which the front or rear wheels are to be rotated (braking test, speedometer test), be sure to follow all warnings, cautions and notes.
NOTE: Do not forget to change the vehicle skid control (VSC) & Traction Control (TRAC) system to operational condition after the test. Check that the VSC warning indicator light goes off when restarting the engine.
2. Using brake tester:  Measure by low-speed type (Vehicle speed: below .3 mph.) brake tester and observe the following instructions before performing test:
   1. Position the wheels to be tested (front or rear) on the tester. See Fig 2.
   Fig 2: Placing Front Wheels On Tester
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Put the center differential in FREE position.
   3. If the vehicle is equipped with Vehicle Skid Control (VSC) system, prohibit the system from activation. See  a.
   4. Shift the transmission shift lever to "N" position.
CAUTION: The maximum speed should be less than 37 MPH, and maximum driving time should be 1 minute.
• Sudden shifting, braking, acceleration or deceleration is not allowed.
• Do not forget to change the Vehicle Skid control (VSC) and Traction Control (TRAC) system to operational condition after the test. Check that the VSC warning indicator light goes off when restarting the engine.
3. Using speedometer test:  Observe the flowing instructions and then measure with the rear wheels:
   1. Position the rear wheels on the tester roller. See Fig 3.
   Fig 3: Placing Rear Wheels On Tester
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Position the front wheels on the free roller rack or jack them up.
   3. Put the center differential in FREE position.
   4. If the vehicle is equipped with Vehicle Skid Control (VSC) and Traction Control (TRAC) system, prohibit the system from activation. See  a.
   5. Ensure the vehicle does not move by securing with cables or straps.
CAUTION: The maximum speed should be less than 37 mph, and maximum driving time should be 1 minute.
• Sudden shifting, braking, acceleration or deceleration is not allowed.
• Do not forget to change the Vehicle Skid control (VSC) and Tractions Control (TRAC) system to operational condition after the test. Check that the VSC indicator light goes off when restarting the engine.
4. Using chassis dynamometer:  Observe the following instructions and then measure with the rear wheels:
   1. Remove the front drive shaft.
   2. Put the center differentials in LOCK position.
   3. If the vehicle is equipped with Vehicle Skid Control (VSC) and Traction Control (TRAC) system, prohibit the system from activation. See  a.
   4. Ensure the vehicle is securely fixed.
CAUTION: The maximum speed should be less than 37 MPH, and maximum driving time should be 1 minute.
• When doing this balancing, pay attention to the other wheels rotating at the same time.
• Sudden shifting, braking, acceleration or deceleration is not allowed.
• Do not forget to change the Vehicle Skid control (VSC) and Tractions Control (TRAC) system to operational condition after the test. Check that the VSC indicator light goes off when restarting the engine.
5. On-vehicle wheel balancing:  When doing on-vehicle wheel balancing on a full-time 4wd vehicle, to prevent each wheel from being rotated at different speeds in different directions (which could damage the center differential), always be sure to observe the following precautions:
   1. All of 4 wheels should be jacked up, being apart from the ground completely.
   2. Put the center differential in LOCK position.
   3. If the vehicle is equipped with Vehicle Skid Control (VSC) and Traction Control (TRAC) system, prohibit the system from activation. See  a.
   4. The parking brake lever should be fully released.
   5. None of the brakes should be applied.
   6. The wheels should be driven on the wheel balancer with the engine running.
   7. Carry out the wheel balancing with the transmission position in "D" position.