- take a test drive to warm up the transmission;
- check the oil level in the gearbox;
- check the engine idle speed;
- check the freedom of movement of the accelerator cable and adjust if necessary;
- check the operation of the gear selection mechanism;
- check that there are no leaks at the gasket and o-ring mounting points in the gearbox.
Transmission malfunctions can be caused by the following reasons:
- poor-quality adjustment;
- malfunctions in the hydraulic system;
- malfunctions in the mechanical system;
- malfunctions in the computer or its electrical circuit.
First of all, check the level and condition of the oil in the gearbox and adjust the linkages.
Possible malfunctions of the automatic transmission and the causes that cause them:
- A burnt smell of oil is a sign of contamination by small particles as a result of wear on the friction linings of automatic transmission controls. This should alert you, as the gearbox may need to be overhauled;
- if the oil level in the automatic transmission is below normal, air will enter the oil pump, resulting in a mixture of oil and air. This, in turn, will cause a decrease in the operating pressure in the control system, slippage of the frictional elements of the gearbox control and gear shifts stretched over time;
- if the oil level is higher than normal, then as a result of the rotation of the gears of the planetary mechanisms, abundant foaming of the oil will begin, which will lead to the same consequences as in the case of a low oil level;
- the formation of an air-oil mixture will eventually cause the oil to overheat and oxidize, which will adversely affect the operation of valves and friction controls. In addition, foaming will cause increased oil release through the breather, which can be mistaken for oil leaks from the system.