Toyota 4Runner: Mechanical System Tests

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Mechanical System Tests

MECHANICAL SYSTEM TESTS

1. STALL SPEED TEST

HINT:

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

CAUTION:

To ensure safety, perform this test in an open and level area that provides good traction.
The 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 more than 5 seconds.
When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.

(a) Connect the Techstream to the DLC3.

(b) Run the vehicle until the transmission fluid temperature is between 50 and 80°C (122 and 176°F).

(d) Chock all 4 wheels.

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

(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 +/-200 rpm

Evaluation

Test Result	Possible Cause
Stall speed is lower than standard value	Stator one-way clutch is not operating properly Torque converter is faulty (stall speed is less than standard value by 600 rpm or more) Engine power may be insufficient
Stall speed is higher than standard value	Line pressure is low C1 clutch is slipping F3 one-way clutch is not operating properly

NOTICE:

Perform the test while the ATF temperature is 50 to 80°C (122 to 176°F).

2. SHIFT TIME LAG TEST

HINT:

This test is to check the condition of the direct clutch, forward clutch, 1st brake and reverse brake.

(a) Connect the Techstream to the DLC3.

(b) Run the vehicle until the transmission fluid temperature is between 50 and 80°C (122 and 176°F).

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

(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 the shock is felt.

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

(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 the shock is felt.

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

Standard value:

D position time lag is less than 1.2 seconds

R position time lag is less than 1.5 seconds

Evaluation

Test Result	Possible Cause
D position time lag exceeds standard value	Line pressure is low C1 clutch is worn F3 one-way clutch is not operating properly
R position time lag exceeds standard value	Line pressure is low C3 clutch is worn B4 brake is worn F1 one-way clutch is not operating properly

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