When Testing Brakes, Speedometer, Etc
WHEN TESTING BRAKES, SPEEDOMETER, ETCa. 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 observe the precautions given below. Incorrect preparations or test procedures may cause a hazard 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 Stability Control (VSC) system (with or without):
If the vehicle is equipped with the VSC 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 after a few seconds.
- Whether wheels should be touching ground or jacked up
- Transmission gear position (N position)
- Transfer gear position (H or L position)
- Maximum testing vehicle speed
- Maximum testing time
HINT: w/o Vehicle Stability 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.
b. Using Braking Tester:
Measure by low-speed type (vehicle speed: below 0.5 km/h or 0.3 mph) brake tester and observe the following instructions before performing the test.
1. Position the wheels to be tested (front or rear) on the tester.
2. Put the center differential in the FREE position.
3. If the vehicle is equipped with a Vehicle Stability Control (VSC) system, prohibit the system from activating (see previous step).
4. Shift the transmission shift lever to the "N" position.
HINT: Do not forget to change the Vehicle Stability Control (VSC) & Traction Control (TRAC) system to the 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 measure 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 the FREE position.
4. If the vehicle is equipped with a Vehicle Stability Control (VSC) & Traction Control (TRAC) system, prohibit the system from activating (see previous step).
5. Ensure that the vehicle does not move using wires.
CAUTION: 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 Stability Control (VSC) & Traction Control (TRAC) system to the 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 measure with the rear wheels.
1. Remove the front propeller shaft.
2. Put the center differential in the LOCK position.
3. If the vehicle is equipped with a Vehicle Stability Control (VSC) & Traction Control (TRAC) system, prohibit the system from activating (see previous step).
4. Ensure that the vehicle is securely fixed in place.
HINT:
- Sudden shifting, braking, acceleration or deceleration is not allowed.
- Do not forget to change the Vehicle Stability Control (VSC) & Traction Control (TRAC) system to the 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 a different speed and 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 (lifted off of the ground completely).
2. Put the center differential in the LOCK position.
3. If the vehicle is equipped with a Vehicle Stability Control (VSC) & Traction Control (TRAC) system, prohibit the system from activating (see previous step).
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 in the D position.
HINT:
- When doing the wheel 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 Stability Control (VSC) & Traction Control (TRAC) system to the operational condition after the test. Check that the VSC warning indicator light goes off when restarting the engine.