Last Modified: 11-29-2007 1.6 D
Service Category: Drivetrain Section: Automatic Transmission/Transaxle
Model Year: 2008 Model: Sequoia Doc ID: RM000000W7B085X
Title: A750F AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: HYDRAULIC TEST (2008 Sequoia)

HYDRAULIC TEST

1. PERFORM HYDRAULIC TEST

(a) Measure the line pressure.

CAUTION:

The line pressure test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

NOTICE:

  • Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 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 with the A/C OFF.
  • When conducting stall test, do not continue more than 5 seconds.

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

(2) Turn the ignition switch off.

(3) Lift the vehicle up.

(4) Remove the test plug on the transmission case center right side 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 kPa (kgf/cm2, psi)

R Position kPa (kgf/cm2, psi)

Idling

350 to 430 kPa

(3.6 to 4.4 kgf/cm2, 51 to 62 psi)

510 to 620 kPa

(5.2 to 6.3 kgf/cm2, 74 to 90 psi)

Stall test

1310 to 1430 kPa

(13.4 to 14.6 kgf/cm2, 190 to 207 psi)

1290 to 1520 kPa

(13.2 to 15.6 kgf/cm2, 187 to 220 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 position only
  • D position circuit fluid leak
  • Clutch No. 1 (C1) defective

Pressure is low in R position only
  • R position circuit fluid leak
  • Clutch No. 3 (C3) defective
  • Brake No. 4 (B4) defective