When Testing Brakes, Speedometer, Etc.

WHEN TESTING BRAKES, SPEEDOMETER, ETC.




a. When carrying out any kind of servicing or testing on a Full-time 4WD 4RUNNER in which the front or rear wheels are to be rotated (braking test, speedometer test), be sure to observe the precautions given below.
Incorrect preparations or test procedures may cause danger as well as unsuccessful test results.

Before starting any such servicing or test, be sure to check the following items:
- Center differential mode position (FREE or LOCK)




- Vehicle skid control (VSC) system:
If the vehicle is equipped with this system, the slip indicator light, the VSC/TRAC indicator light and the VSC OFF indicator light come on with the ignition switch turned ON. They will go off in a few seconds.

- Whether wheels should be touching ground or jacked up
- Transmission gear position (N position)
- 4WD switch position (H4 or L4 position)
- Maximum testing vehicle speed
- Maximum testing time




b. Using Braking Tester:
Test by low-speed type brake tester (Vehicle Speed: Below 0.5 km/h or 0.3 mph) and observe the following instructions before the test.
1. Position the wheels to be tested (front or rear) on the tester.
2. Put the center differential in FREE position.
3. If the vehicle is equipped with the Vehicle Skid Control (VSC) system, prohibit the system from the activation.
4. Shift the transmission shift lever to "N" position.

HINT: 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.




c. Using Speedometer Tester:
Observe the following instructions and then test with the rear wheels.
1. Position the rear wheels on the tester roller.
2. Position the front wheels on the free roller or jack them up.
3. Put the center differential in FREE position.
4. If the vehicle is equipped with the Vehicle Skid Control (VSC) & Traction Control (TRAC) system, prohibit the system from the activation.
5. Ensure that the vehicle does not move using wires.

NOTE: The maximum speed should be less than 60 km/h (37 mph) and maximum driving time should be 1 minute.

HINT:
- Sudden shifting, braking, acceleration or deceleration is not allowed.
- 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.




d. Using Chassis Dynamometer:
Observe the following instructions and then test with the rear wheels.
1. Remove the front propeller shaft.
2. Put the center differential in LOCK position.
3. If the vehicle is equipped with the Vehicle Skid Control (VSC) & Traction Control (TRAC) system, prohibit the system from the activation.
4. Ensure that the vehicle is securely fixed.

HINT:
- Sudden shifting, braking, acceleration or deceleration is not allowed.
- 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.




e. 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 speed in different directions (which could damage the center differential), always be sure to observe the following precautions.
1. All 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 the Vehicle Skid Control (VSC) & Traction Control (TRAC) system, prohibit the system from the activation.
4. The parking brake lever should be fully released.
5. No brake 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.

HINT:
- When doing this balancing, pay attention to the other wheels rotating at the same time.
- Sudden acceleration, deceleration or braking is not allowed.
- 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.