Toyota 4Runner: Hydraulic Test

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Hydraulic Test

HYDRAULIC TEST

1. PERFORM HYDRAULIC TEST

(a) Measure the line pressure.

CAUTION:

The line pressure test should always be carried out in pairs. One technician should observe the conditions of the wheels and wheel stoppers from outside the vehicle while the other is performing the test.

NOTICE:

Perform the test while the ATF (Automatic Transmission Fluid) temperature is 50 to 80°C (122 to 176°F).
Be careful to prevent SST hose from interfering with the exhaust pipe.
This check must be conducted after checking and adjusting the engine.
Perform the test with the A/C off.
When conducting the stall test, do not continue for more than 5 seconds.
When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.

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

(2) Turn the ignition switch off.

(3) Lift the vehicle up.

(4) Remove the test plug from the transmission case and connect SST.

SST: 09992-00095

09992-00231

09992-00271

(5) Lower the vehicle.

(6) Fully apply the parking brake and chock the 4 wheels.

(7) Start the engine and check the idling speed.

(8) Keep your left foot pressed firmly on the brake pedal and move the shift lever to D.

(9) Measure the line pressure when the engine is idling.

(10) Fully depress the accelerator pedal with your right foot. Quickly read the highest line pressure when the engine speed reaches stall speed.

(11) In the same manner, perform the test with the shift lever in R.

Specified Line Pressure

Condition	D Position	R Position
Stall test	1200 to 1450 kPa (12.2 to 14.8 kgf/cm2, 174 to 210 psi)	1150 to 1400 kPa (11.7 to 14.3 kgf/cm2, 167 to 203 psi)

Condition

D Position

R Position

Stall test

1200 to 1450 kPa

(12.2 to 14.8 kgf/cm2, 174 to 210 psi)

1150 to 1400 kPa

(11.7 to 14.3 kgf/cm2, 167 to 203 psi)

Evaluation

Problem	Possible Cause
Measured values at all positions are higher than specified pressure	Shift solenoid valve SLT defective Regulator valve defective
Measured values at all positions are lower than specified pressure	Shift solenoid valve SLT defective Regulator valve defective Oil pump defective
Pressure is low in D only	D position circuit fluid leak Clutch No. 1 (C1) defective
Pressure is low in R only	R position circuit fluid leak Clutch No. 3 (C3) defective Brake No. 4 (B4) defective

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