Toyota Sienna Service Manual: Hydraulic test

Toyota Sienna Service Manual / U151e automatic transaxle / Automatic transaxle system / Hydraulic test

1. Perform hydraulic test

Perform hydraulic test

(a) Measure the line pressure.

NOTICE:

Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).
The line pressure 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 performing the test.
Be careful to prevent SST hose from interfering with the exhaust pipe.
This Check must be conducted after checking and adjusting engine.
Perform under condition that A/C is OFF.
When conducting stall test, do not continue more than 10 seconds.

(1) Warm up the ATF (Automatic Transmission Fluid).

(2) Lift the vehicle up.

(3) Remove the engine under cover.

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

(5) Remove the test plug A on the transaxle case front left side and install the SST.

SST 09992-00095 (09992-00231, 09992- 00271)

NOTICE: There is a difference in installation point between D position and R position.

(6) Start the engine.

(7) Using intelligent tester, shift to D position and hold 3rd gear by active test, and measure the line pressure in idling.

Specified line pressure:

(8) Turn the ignition switch off.

Perform hydraulic test

(9) Disconnect the connector of the transmission wire.

HINT: Disconnect the connector only when performing the D position stall test.

(10)Start the engine.

(11)Firmly depress the brake pedal, shift to the D position, depress the accelerator pedal all the way down and check the line pressure while the stall test is performed.

Specified line pressure:

(12)Turn the ignition switch off.

(13)Remove the SST, install the test plug A.

(14)Remove the test plug B, install the SST and start engine.

SST 09992-00095 (09992-00231, 09992- 00271)

(15)Connect the transmission wire connector, depress the brake pedal firmly, shift to the R position and check that the line pressure while the engine is idling and during the stall test.

Specified line pressure:

(16)Remove the SST, install the test plug B.

(17)Clear the DTC.

Evaluation:

Problem	Possible cause
Measured values are higher than specified in all positions	Shift solenoid valve SLT defective Regulator valve defective
Measured values are lower than specified in all positions	Shift solenoid valve SLT defective Regulator valve defective Oil pump defective U/D (Underdrive) direct clutch defective
Pressure is low in the D position only	D position circuit fluid leak Forward clutch defective
Pressure is low in the R position only	R position circuit fluid leak Reverse clutch defective 1st and reverse brake defective

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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 pos ...

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