Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Mechanical System Tests

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Drivetrain / U881e (automatic Transmission / Transaxle) / Automatic Transaxle System / Mechanical System Tests

MECHANICAL SYSTEM TESTS

STALL SPEED TEST

HINT:

This test is to check the overall performance of the engine and transaxle.

CAUTION:

This test should be done on a paved surface (a surface that is not slippery).
To ensure safety, perform this test in an open and level area that provides good traction.
A stall speed 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:

Do not perform the stall speed test for longer than 5 seconds.
When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
Perform this test with the ATF (Automatic Transaxle Fluid) at the normal operating temperature: 50 to 80°C (122 to 176°F)
Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

(a) Connect the Techstream to the DLC3.

(b) Drive the vehicle until the transaxle fluid temperature has reached 50 to 80°C (122 to 176°F).

(d) Chock all 4 wheels.

(e) Set the parking brake and keep the brake pedal depressed firmly with your left foot.

HINT:

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

(f) Move the shift lever to D.

(g) Depress the accelerator pedal as much as possible with your right foot.

(h) Read the engine speed (stall speed) and release the accelerator pedal immediately.

Standard Value:

2400 +/- 150 rpm

Evaluation

Test Result	Possible Cause
Stall speed is lower than standard value	Engine power output may be insufficient Stator one-way clutch not operating properly HINT: If the value is less than the specified value by 600 rpm or more, the torque converter assembly may be malfunctioning.
Stall speed is higher than standard value	Line pressure is too low No. 1 clutch (C1) slipping No. 1 one-way clutch (F1) is not operating properly Improper fluid level

Test Result

Possible Cause

Stall speed is lower than standard value

Engine power output may be insufficient
Stator one-way clutch not operating properly

HINT:

If the value is less than the specified value by 600 rpm or more, the torque converter assembly may be malfunctioning.

Stall speed is higher than standard value

Line pressure is too low
No. 1 clutch (C1) slipping
No. 1 one-way clutch (F1) is not operating properly
Improper fluid level

SHIFT TIME LAG TEST

NOTICE:

Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

HINT:

When the shift lever is moved while the engine is idling, there will be a certain time lapse or lag before shock can be felt. This is used for checking the condition of the clutch and brake.

(a) Connect the Techstream to the DLC3.

(b) Drive the vehicle until the transaxle fluid temperature has reached 50 to 80°C (122 to 176°F).

(d) Set the parking brake and keep the brake pedal depressed firmly.

HINT:

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

(e) Check the D position time lag.

(1) Move the shift lever to N and wait for 1 minute.

(2) Move the shift lever to D and measure the time until shock is felt.

(3) Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests.

Standard Value:

D position time lag is less than 1.2 seconds

(f) Check the R position time lag.

(1) Move the shift lever to N and wait for 1 minute.

(2) Move the shift lever to R and measure the time until shock is felt.

(3) Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests.

Standard Value:

R position time lag is less than 1.2 seconds

Evaluation

Test Result	Possible Cause
D position time lag exceeds standard value	Line pressure is low No. 1 clutch (C1) is worn No. 1 one-way clutch (F1) is not operating properly
R position time lag exceeds standard value	Line pressure is low No. 3 clutch (C3) is worn No. 2 brake (B2) is worn

Road Test

ROAD TEST PROBLEM SYMPTOM CONFIRMATION (a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transaxle does not shift up, shift down, or t ...

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 wheel ...

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Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Mechanical System Tests

Road Test

Hydraulic Test

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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual