Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Hydraulic Test

HYDRAULIC TEST

PERFORM HYDRAULIC TEST

(a) Measure the line pressure.

CAUTION:

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

NOTICE:

  • Perform this test with the ATF (Automatic Transaxle Fluid) at the normal operating temperature: 50 to 80°C (122 to 176°F)
  • Be careful to prevent the SST hose from contacting the exhaust pipe.
  • This check must be conducted after checking and confirming that the engine is normal.
  • Perform this test with the air conditioning off.
  • Do not perform the stall test for longer than 5 seconds.
  • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
  • The installation position of SST is different for the D position and R position line pressure tests.
  • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

(1) Warm up the ATF.

(2) Lift the vehicle.

(3) Remove the engine under cover.

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

SST: 09993-19015

09993-00010

09993-00040

*a

Test Plug A

(5) Lower the vehicle.

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

HINT:

When the electric parking brake switch assembly is pulled 2 times (2 lock operations), the maximum amount of braking force is applied.

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

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

(9) Measure the line pressure with the engine idling.

(10) Depress the accelerator pedal as much as possible with your right foot. Quickly read the highest line pressure reading when the engine speed reaches stall speed.

Specified Line Pressure

Condition

D Position

Idling

420 to 510 kPa

(4.2 to 5.3 kgf/cm2, 60 to 74 psi)

Stall test

1560 to 1750 kPa

(15.9 to 17.9 kgf/cm2, 226 to 254 psi)

(11) Turn the engine switch off.

(12) Remove SST and install the test plug A.

(13) Remove the test plug B on the left side of the transaxle case and install SST.

*a

Test Plug B

SST: 09993-19015

09993-00010

09993-00040

(14) Start the engine and check the idle speed.

(15) Keep your left foot firmly on the brake pedal and move the shift lever to R.

(16) Measure the line pressure with the engine idling.

(17) Depress the accelerator pedal as much as possible with your right foot. Quickly read the highest line pressure reading when the engine speed reaches stall speed.

Specified Line Pressure

Condition

R Position

Idling

560 to 670 kPa

(5.7 to 6.9 kgf/cm2, 81 to 98 psi)

Stall test

1750 to 2050 kPa

(17.8 to 21.0 kgf/cm2, 253 to 298 psi)

(18) Turn the engine switch off.

(19) Remove SST and install the test plug B.

(20) Clear the DTCs.

Click here

Evaluation

Problem

Possible Cause

Measured values at all positions are higher than specified

  • Shift solenoid valve SLT defective
  • Regulator valve defective

Measured values at all positions are lower than specified

  • Shift solenoid valve SLT defective
  • Regulator valve defective
  • Oil pump defective

Pressure is low when shift lever is in D only

  • D position circuit fluid leak
  • No. 1 clutch (C1) defective

Pressure is low when shift lever is in R only

  • R position circuit fluid leak
  • No. 3 clutch (C3) defective
  • No. 2 brake (B2) defective
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