D range time lag is less than seconds R range time lag is less than seconds Evaluation

TEST RESULT AND POSSIBLE CAUSE

Test Result

Possible Cause

D range time lag exceeds standard value

• Line pressure is low

• Clutch No. 1 (C1) is worn

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

• One-way clutch No. 3 (F3) is not operating properly

• Line pressure is low

R range time lag exceeds standard

• Clutch No. 3 (C3) is worn

value

• Brake No. 4 (B4) is worn

• One-way clutch No. 1 (F1) is not operating

properly

HYDRAULIC TEST

1. MEASURE LINE PRESSURE

NOTE: • 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 performed with at least 2 people. One person should observe the condition of the wheels or wheel chocks while the other is performing the test.

• Be careful to prevent SST's hose from interfering with the exhaust pipe.

• This test must be performed after checking and adjusting the engine.

• When conducting the stall test, do not continue for more than 10 seconds.

b. Lift the vehicle up.

c. Remove the test plug on the transmission case center right side and connect SST.

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

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

G020657E01

Fig. 6: Identifying Line Pressure SST

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d. Fully apply the parking brake and chock the 4 wheels.

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia e. Start the engine and check idling speed.

f. Keep your left foot firmly on the brake pedal and shift the shift lever into the D position.

g. Measure the line pressure when the engine is idling.

h. Depress the accelerator pedal as much as possible. Quickly read the highest line pressure reading when the engine speed reaches stall speed.

i. Perform the measure line pressure test again with the shift lever in the R position. Standard line pressure

CONDITK

ON AND POSITION CHART

Condition

D Position

R Position

Idling

361 to 421 kPa (3.7 to 4.3 kgf/cm2 , 52 to 61 psi)

495 to 576 kPa (5.0 to 5.9 kgf/cm2 , 72 to 84 psi)

Stall

1,236 to 1,332 kPa (12.6 to 13.6 kgf/cm2 , 179 to 193 psi)

1,229 to 1,349 kPa (12.5 to 13.8 kgf/cm2 , 178 to 196 psi)

Evaluation:

PROBLEM AND POSSIBLE CAUSE

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

Pressure is low in the D position only

• D position circuit fluid leak

• Clutch No. 1 (C1) defective

Pressure is low in the R position only

• R position circuit fluid leak

• Brake No. 4 (B4) defective

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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