Attention! No one should stand in front of or behind the vehicle while testing.
1. Before testing, check the levels of all operating fluids and, if necessary, bring them to normal levels. The temperature of the transmission and coolant fluids should be between 80–90°C.
2. Place chocks under the rear wheels.
3. Connect the control tachometer.
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 no more than 5 s. If more than one test is to be carried out with the engine running, move the selector lever to the «N» and leave the engine running at a crankshaft speed of about 1000 min-1 until the transmission fluid cools down. 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): 2200–2800 min-1.
7. Do the same test in the position «R» selector lever.
Analysis of test results
1. If the engine speed is higher than the specification in position «D» And «R», then the reason for this is the slipping of the rear clutch or the freewheel of the gearbox. In this case, check the hydraulic system of the transmission to determine the cause of slippage.
2. If the engine speed is above the specification only in position «R», then the cause of this is the slipping of the front clutch or the brake of the overdrive and the reverse gear of the transmission. In this case, check the hydraulic system of the transmission to determine the cause of slippage.
3. If the engine speed is below the specification in position «D» And «R», then the reason for this is insufficient power developed by the engine, or a malfunction of the torque converter. Check the engine for misfiring,
ignition timing angles, gaps in the valve drive mechanism, etc. If the engine is OK, then the torque converter is faulty.