Warning. During this test, make sure that no one is in front of or behind the vehicle.
1. Check the fluid level in the gearbox. Fluid must be at normal operating temperature (70-80°C).
Engine coolant should also be at normal operating temperature (80-90°C).
2. Install wedges under the rear wheels.
3. Connect the engine tachometer.
4. Apply the parking and service brakes.
5. Start the engine.
6. With the shift lever in position «D», fully depress the accelerator pedal to fix the maximum engine speed. Do not hold the throttle open longer than necessary to obtain maximum engine speed, and never more than 5 seconds at a time. If more than one lockout test is required, run the engine for about 2 minutes between tests to cool the transmission fluid. in neutral gear at a speed of about 1000 rpm.
- Critical engine speed when braking the torque converter during the test: 2500±3000 rpm
7. Set the shift lever to the position «R» and test as described above.
If the critical speed is above normal, there is slippage in the rear clutch or overrunning transmission clutch (lever position «ABOUT»).
If the critical speed is above normal, there is slippage in the transmission front clutch or low and reverse brakes (lever position «R»). In these cases, test to determine the cause of the slip.
If at lever positions «ABOUT» And «R» the critical speed is below normal, it can be assumed that the engine power is insufficient or the torque converter is malfunctioning. Check for misfiring in the engine, correct ignition timing, valve clearances, etc. If everything is in order in the engine, the torque converter is faulty.