Toyota Sienna Service Manual: Mechanical system tests

Toyota Sienna Service Manual / U151e automatic transaxle / Automatic transaxle system / 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).
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50 to 80°C (122 to 176°F).
Do not continuously run this test for longer than 10 seconds.
To ensure safety, do this test in a wide, clear level area which provides good traction.
The stall test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is doing the test.

(1) Chock the 4 wheels.

(2) Connect the intelligent tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3.

(3) Fully apply the parking brake.

(4) Keep your left foot pressed firmly on the brake pedal.

(5) Start the engine.

(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.

(7) Quickly read the stall speed at this time.

Stall speed: 2,300 +- 150 rpm

Evaluation:

Problem

Possible cause

(a) Stall engine speed is low in D position

Engine power output may be insufficient
Stator one-way clutch not operating properly

HINT: If the value is less than the specified value by 600 rpm or more, the torque converter could be faulty.

(b) Stall engine speed is high in D position

Line pressure is too low
Forward clutch slipping
U/D (Underdrive) brake slipping
U/D (Underdrive) one-way clutch is not operating properly
No.1 one-way clutch not operating properly
Improper fluid level

(b) Measure the time lag.

(1) When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before the shock can be felt. This is used for checking the condition of the clutch and brake.

NOTICE:

Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).
Be sure to allow 1 minute interval between tests.
Perform the test three times, and measure the time lags. Calculate the average value of the three time lags.
When conducting stall test, do not continue more than 10 seconds.

(2) Connect the intelligent tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3.

(3) Fully apply the parking brake.

(4) Start and warm up the engine and check idle speed.

Idle speed: approx. 700 rpm (In N position and A/C OFF)

(5) Shift the lever from N to D position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt.

Time lag: N → D less than 1.2 seconds

(6) In the same way, measure the time lag for N → R.

Time lag: N → R less than 1.5 seconds

Evaluation (If N → D or N → R time lag is longer than the specified):

Problem	Possible cause
N → D time lag is longer	Line pressure is too low Forward clutch worn No.1 one-way clutch is not operating properly U/D (Underdrive) one-way clutch is not operating U/D (Underdrive) brake worn
N → R time lag is longer	Line pressure is too low Reverse clutch worn 1st and reverse brake worn U/D (Underdrive) brake worn

Road test

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Hydraulic test

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