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Toyota Sienna Service Manual: When servicing full-time 4wd vehicles

Toyota Sienna Service Manual / Introduction / Repair instruction / Precaution / When servicing full-time 4wd vehicles

The full-time 4WD SIENNA is equipped with the open center differential system.

If incorrect preparations or test procedures are used, the test will not only be unsuccessful, but may be dangerous as well.

Therefore, before beginning any such servicing or test, be sure to check the following items:

CAUTION: • Never accelerate or decelerate the vehicle suddenly • Observe the other cautions given for each individual test

(a) Before Beginning Test

This vehicle does not have a center diff. lock mode or 4WD (Normal) Mode to allow only the front or rear wheel to be rotated.

The test method for this vehicle is different from that for vehicles equipped with the center diff. lock mode or 4WD (Normal) Mode, so make sure to use the correct test method.

Braking Force Test Braking Force Test

(Vehicle Speed: Below 0.5 km/h or 0.3 mph) When performing low-speed type brake tester measurements, observe the following instructions.

(1) Position the wheels to be tested (front or rear) on the tester.

(2) Shift the transaxle shift lever to "N" position.

(3) Idle the engine, operate the brake booster and perform the test.

(c) Speedometer Test or Other Tests

(Using Speedometer Tester or Chassis Dynamometer)

When performing test at high speed or high load, use the methods shown below.

*: This is to avoid damaging the center differential.

NOTICE: • Confirm that the vehicle is securely immobilized. • Never operate the brakes to drive the wheels or stop them suddenly.

(d) On-Vehicle Wheel Balancing

On-Vehicle Wheel Balancing
On-Vehicle Wheel Balancing

When doing on-vehicle wheel balancing on a fulltime 4WD vehicle, to prevent the wheels from rotating at different speeds in different directions from each other (which could damage the center differential), always be sure to observe the following precautions:

(1) All 4 wheels should be jacked up, clearing the ground completely.

(2) The parking brake lever should be fully released.

(3) None of the brakes should be allowed to drag.

(4) The wheels should be driven on the wheel balancer with the engine running.

HINT:

When doing this, be careful of the other wheels, which will rotate at the same time.

(5) Avoid sudden acceleration, deceleration and braking.

(6) Carry out wheel balancing with the transaxle in D position.

For vehicles equipped with mobile communication systems
FOR VEHICLES EQUIPPED WITH MOBILE COMMUNICATION SYSTEMS (a) Install the antenna far away from the ECU and sensors of the vehicle electronic systems as possible. (b) Install an antenna feeder ...

For vehicles equipped with traction control (trac) system
When using a 2-wheel drum tester such as a speedometer tester or chassis dynamometer, etc., or jacking up the front wheels and driving the wheels, always push in the TRAC cut ("TRAC OFF") ...

Other materials:

Data list / active test
1. DATA LIST HINT: Using the DATA LIST displayed on the intelligent tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.  Connect the intelligent tes ...

Mechanical system tests
1. PERFORM MECHANICAL SYSTEM TESTS (a) Measure the stall speed. The object of this test is to check the overall performance of the transaxle and engine by measuring the stall speeds in the D position. NOTICE: Driving test should be done on a paved road (a nonskid road). Per ...

Actuator Supply Voltage Circuit / Open
DTC P0657 Actuator Supply Voltage Circuit / Open DESCRIPTION The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage is usually 0 V when the ignition switch is turned off. If the output voltage is higher t ...

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