Part 3
INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION - Continued
9. WHEN SERVICING FULL-TIME 4WD VEHICLES
(a) The full-time 4WD LAND CRUISER is equipped with a mechanical lock type center differential system.
(b) During tests that require the use of a brake tester or chassis dynamometer, such as braking force tests or speedometer tests, if only the front or rear wheels are to be rotated, it is necessary to set the center differential to lock or free depending on the type of test being performed.
Center Differential Free Condition
Center Differential Lock Condition
CAUTION:
Center differential lock - free selecting procedures:
* Operate the switch only when all 4 wheels are stopped or driving in a straight line.
* Never operate the switch when any wheel is slipping.
* Never operate the switch when any wheel is spinning freely.
* Never operate the switch when swerving or cornering.
10. WHEN TESTING BRAKES, SPEEDOMETER, ETC.
(a) When carrying out any kind of servicing or testing on a Full-time 4WD with Active Traction Control System & Vehicle Stability Control (VSC) System in which the front or rear wheels are to be rotated (braking test, speedometer test), be sure to observe the precautions listed below.
Incorrect preparations or test procedures may cause damage as well as unsuccessful test results.
(b) Before starting any such servicing or test, be sure to check the following items:
* Enter test mode using the Techstream Test Mode Procedure.
* The center differential (lock or free)
* Whether wheels should be touching the ground or jacked up
* Transmission gear position (N position)
* 4WD control switch (H4 or L4 position)
* Maximum testing vehicle speed
* Maximum testing time
CAUTION:
* Inspection should be done on the rear wheels.
* Do not start, accelerate or decelerate the vehicle suddenly.
* Maximum vehicle speed must be below 60 km/h (37 mph) (when using a free roller, it must be below 50 km/h (31 mph)).
NOTICE:
* A tester with a load setting function for only two wheels cannot be used.
* The driving time should be less than 1 minute.
(c) When using a braking force tester (not free roller type):
When performing measurements using a low-speed type brake tester, observe the following instructions.
(1) Enter test mode using the Techstream Test Mode Procedure.
(2) Turn the center differential to free.
(3) Position the rear wheels on the tester.
(4) Jack up the front wheels.
(5) Ensure that the vehicle does not move using wires.
(6) Move the transmission shift lever to N.
(7) Idle the engine, operate the brake booster and perform the test.
CAUTION:
If the vehicle is tested in normal mode on the drum tester, VSC operation may cause the vehicle to jump out from the drum tester.
NOTICE:
* The maximum driving time should be 1 minute.
* Do not forget to change the VSC to the operational condition after the test.
(d) When using a braking force tester (free roller type):
When performing measurements using a low-speed type brake tester, observe the following instructions.
(1) Enter test mode using the Techstream Test Mode Procedure.
(2) Turn the center differential to free.
(3) Position the rear wheels on the tester roller.
(4) Position the front wheels on the free roller.
(5) Ensure that the vehicle does not move using wires.
(6) Move the transmission shift lever to N.
(7) Idle the engine, operate the brake booster and perform the test.
CAUTION:
If the vehicle is tested in normal mode on the drum tester, VSC operation may cause the vehicle to jump out from the drum tester.
NOTICE:
* The maximum driving time should be 1 minute.
* Do not forget to change the VSC to the operational condition after the test.
(e) When using a speedometer (not free roller type):
Observe the following instructions and then measure with the rear wheels.
(1) Enter test mode using the Techstream Test Mode Procedure.
(2) Turn the center differential to lock.
(3) Position the rear wheels on the tester.
(4) Jack up the front wheels.
(5) Ensure that the vehicle does not move using wires.
(6) Move the transmission shift lever to D.
CAUTION:
If the vehicle is tested in normal mode on the drum tester, VSC operation may cause the vehicle to jump out from the drum tester.
NOTICE:
* The maximum speed should be less than 50 km/h (31 mph).
* If the measurement must be made while the vehicle speed is over 50 km/h (31 mph), remove the front propeller shaft.
* Do not forget to change the VSC to the operational condition and the center differential to free condition after the test.
(f) When using a speedometer (free roller type):
Observe the following instructions and then measure with the rear wheels.
(1) Enter test mode using the Techstream Test Mode Procedure.
(2) Turn the center differential to lock.
(3) Position the rear wheels on the tester roller.
(4) Position the front wheels on the free roller.
(5) Ensure that the vehicle does not move using wires.
(6) Shift the transmission shift lever to D.
CAUTION:
If the vehicle is tested in normal mode on the drum tester, VSC operation may cause the vehicle to jump out from the drum tester.
NOTICE:
* The maximum speed should be less than 50 km/h (31 mph).
* If the measurement must be made while the vehicle speed is over 50 km/h (31 mph), remove the front propeller shaft.
* Do not forget to change the VSC to the operational condition and the center differential to free condition after the test.
(g) Using a chassis dynamometer.
NOTICE:
If you do not observe the following conditions for the test, there will be cases where the 4WD functions will deteriorate, the parts in the drive-train system will have a malfunction, or the vehicle will jump out. Therefore, do not conduct a test unless observing the following conditions.
HINT
When conducting a test with the vehicle highly loaded are driven at high speeds, observe the following:
NOTICE:
* Do not suddenly accelerate and do not suddenly apply the brakes.
* Confirm that the vehicle is securely immobilized.