1. Check the height of the automatic transmission fluid level
Before doing any automatic transmission inspection or troubleshooting, the first thing to do is to check the transmission fluid level height, the vehicle every 10000km or every 6 months, should check the fluid level height.
Vehicles first drive a few minutes, so that the transmission reaches the normal operating temperature (70 ℃ ~ 80 ℃), the vehicle will be parked on a flat surface, tighten the parking brake, keep the engine idling, step on the parking brake pedal, will change the gear lever from the P gear sequentially into each gear, and stay in each gear for more than 30s, and finally into the P gear, and then observe the automatic transmission dipstick mark. Under normal operating temperature, the oil level should be within the HOT range, if it is lower, it means that it is necessary to add the same type of transmission fluid.
2. Check the quality of the automatic transmission fluid
The fluid should be clean and odorless. If the fluid is black, dark red or dark brown, the lubricant should be replaced; if there is a burning odor in the fluid, or metal shavings in the fluid, or gelatin in the fluid, the transmission should be disassembled for in-depth inspection.
3. Check whether the hydraulic system leakage
Hydraulic system connections have oil seals and gaskets. These parts are often leakage places. Oil leakage will cause a drop in oil pressure, resulting in a variety of failures, therefore, if there is a leak, should be eliminated in a timely manner. Common oil leakage parts are speed sensor O-shaped seal, speed sensor ○-shaped seal, electromagnetic coil wiring ○-shaped seal, dipstick conduit O-shaped seal, pressure line test plugs and ○-shaped seals, direct gear clutch speed sensor oil seals, oil pump oil seals, hydraulic oil cooler fittings, accumulator back pressure test plugs and ○-shaped seals, the oil pan and transmission joints, etc., should be checked one by one, should not be missed. checked one by one without omission.
4. Check and adjust the position of the gearshift lever.
Shift lever from N to other gears, the shift lever should be smooth and accurate into the gear, shift indicator can correctly indicate the gear, such as the indicator and the gear does not match, it should be adjusted, the method is to loosen the positioning nut on the shift lever, push the control shaft backward to the end, and then back forward two notches to the N position, the shift lever in the N position, tighten the positioning nut on the gearshift lever. Start the engine and do the starting test, in D gear, the vehicle moves forward, in R gear, the vehicle backward.
5. Check and adjust the neutral starting switch
Check that the engine should only start when the shift lever is in N or P, and not in any other gear; otherwise, make adjustments in the following order:
(1) Loosen the neutral switch bolt, then set the shift lever in N.
(2) Align the neutral reference line with the notch.
(3) Hold the position and tighten the bolt to a torque of 13 N-m.
6. Check engine idle speed
The idle speed of the engine will also affect the normal operation of the automatic transmission. If the idle speed is too high, from N to P or to D, R, 2, 3, will cause the vehicle to vibrate; if the idle speed is too low, from N to P, there is an engine shutdown or in the process of driving on the brake to stop, the engine is prone to stall. General sedan in N gear, turn off the air conditioning switch, idle speed range in 750r/min, if not meet the requirements, should be adjusted.
