Warning! No one should stand in front of or behind the vehicle while testing.
Order of execution
1. Before testing, check the levels of all operating fluids and, if necessary, bring them to normal levels. The temperature of the transmission fluid should be between 80-90°C, and the coolant 80-90°C.
2. Place chocks under the front and rear wheels.
3. Connect a tachometer to the engine.
4. Apply the parking brake and depress the brake pedal.
5. Start the engine.
6. Move the selector lever to position "D". Press the brake pedal all the way down with your left foot, and gently press the accelerator pedal with your right foot. When the engine speed no longer increases, read the tachometer and release the accelerator pedal. To exclude damage to the gearbox, test for 5 s. If it is necessary to carry out more than one test with the engine running, move the selector lever to position N and leave the engine running at idling speed for 2 minutes. Running the engine at idle speed cools the transmission fluid and prevents deterioration of its properties.
Engine speed when testing the combined operation of the automatic transmission and the engine on a stationary vehicle (stall test): 2300–2700 min–1.
7. Do the same test in the position "R" selector lever.
If the engine speed is above specification in position D, the transmission fluid pressure is low due to a leak in the rear clutch or freewheel.
If the engine speed is above specification in position R, the transmission fluid pressure is insufficient due to a leak in the front clutch or front lower and reverse brake band.
If the engine speed is below specification in position D, the transmission fluid pressure is insufficient due to a worn oil pump or a defective torque converter.