Mechanical System Tests

A340E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: MECHANICAL SYSTEM TESTS

1. STALL SPEED TEST

HINT
The object of this test is to check the overall performance of the engine and transmission.

NOTICE:
* Do not perform the stall speed test for longer than 5 seconds.
* 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.

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List /All Data.

(e) Run the vehicle until the transmission fluid temperature has reached 50 to 80°C (122 to 176°F).

(f) Allow the engine to idle with the air conditioning OFF.

(g) Chock all 4 wheels.

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

(i) Shift the shift lever into the D position.

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

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

Standard value:

2000 +/- 150 rpm

Evaluation:





2. SHIFT TIME LAG TEST

HINT
The object of this test is to check the condition of the direct clutch, forward clutch, and 1st and reverse brake.

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data.

(e) Run the vehicle until the transmission fluid temperature has reached 50 to 80°C (122 to 176°F).

(f) Allow the engine to idle with the air conditioning OFF.

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

(h) Check the D range time lag.

(1) Shift the shift lever into the N position and wait for 1 minute.

(2) Shift the shift lever into the D position and measure the time until the shock is felt.

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

(i) Check the R range time lag.

(1) Shift the shift lever into the N position and wait for 1 minute.

(2) Shift the shift lever into the R position and measure the time until the shock is felt.

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

Standard value:

D range time lag is less than 1.2 seconds

R range time lag is less than 1.5 seconds

Evaluation: