Caution! No one should stand in front or behind the vehicle while testing.
1. Before testing, check the levels of all operating fluids and, if necessary, bring them to normal. The temperature of the transmission and cooling fluids should be within 80-90°C.
2. Place chocks under the rear wheels.
3. Connect the reference tachometer.
4. Apply the parking brake and press the brake pedal.
5. Start the engine.
6. Move the selector lever to the "D" position. Press the brake pedal fully 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 avoid damage to the transmission, test for no more than 5 seconds. If more than one test is required with the engine running, move the selector lever to the "N" position and let the engine run at crankshaft speed for about 1000 min⁻¹ until the transmission fluid cools down. Running the engine at idling speed cools the transmission fluid and prevents its properties from deteriorating. Engine speed when testing the combined operation of the automatic transmission and engine with the vehicle stationary (stall test): 2200–2800 min⁻¹.
7. Carry out the test in the same manner in the "R" position of the selector lever.
Analysis of test results
1. If the engine speed is higher than the specification in the "D" and "R" positions, the cause is slipping of the rear clutch or the overrunning clutch of the transmission. In this case, check the transmission hydraulic system to find out the cause of slipping.
2. If the engine speed is higher than the specification only in the "R" position, the cause is slippage of the front clutch or the overdrive and reverse brake of the transmission. In this case, check the transmission hydraulic system to find out the cause of slippage.
3. If the engine speed is below the specification in the "D" and "R" positions, the cause is insufficient engine power or a faulty torque converter. Check the engine for misfires, incorrect ignition timing, valve clearances, etc. If the engine is OK, the torque converter is faulty.