Note: due to the complexity of the automatic transmission design, diagnosing and repairing it is beyond the capabilities of an amateur mechanic. If malfunctions are detected, the elimination method of which is not described below, the vehicle should be taken to a branded or specialized station.
27 There is unsatisfactory operation of the gear shift mechanism
1. B Chapter 7A describes the procedures for checking and adjusting the gear shift mechanism of an automatic transmission. Incorrect adjustment leads to the following malfunctions:
- A) Starting the engine in gears other than "Park" or "Neutral".
- b) Discrepancy between the inclusion indication on the instrument panel and the actual gear engaged.
- With) The car moves while the mode is on "Park".
2. Perform cable adjustment as described in Chapter 7A.
3. Malfunction of the solenoid valve of the switching mechanism. Check Diagnostic Trouble Codes (chapter 6).
28 When pressing the accelerator pedal, the gear does not downshift
Malfunction of the control solenoid valve of the transmission hydraulic system. Check Diagnostic Trouble Codes (chapter 6).
29 There is slippage in the box, noise has appeared, or the car does not move in forward or reverse gears
1. These problems can occur for a number of reasons. The only checking procedure that lies within the competence of a car mechanic is checking the transmission fluid level.
2. Before contacting the station, check the condition and level of the transmission oil in the box, as described in Chapter 1, and, if necessary, adjust the level or replace the fluid and filter. If these measures do not resolve the problem, seek the services of professionals.
3. Delayed gear shifting, which is characterized by harshness, may occur due to failure of the control solenoid valve of the transmission hydraulic system. Check Diagnostic Trouble Codes (chapter 6).
30 Transmission fluid is leaking
1. Transmission fluid is dark red in color. Traces of a transmission fluid leak should not be confused with traces of engine oil, which can be carried onto the box by the air flow when the car is moving.
2. To determine the source of the leak, clean the box casing and the surrounding area. Use degreasers or a steam cleaner for cleaning. After cleaning, drive at a low speed so that the liquid is not blown away from the source of the leak by wind. Raise the vehicle and determine the source of the leak. As a rule, these are the following elements.
- A) Pan: tighten the mounting bolts and/or, if necessary, replace the pan gasket (see _ chapter 1).
- b) Filler tube: Replace the rubber seal located at the interface between the tube and the transmission housing.
- With) Transmission hydraulic oil lines: tighten the couplings to the gearbox casing and/or replace the oil lines.
- d) Vent tube: Transmission is overfilled and/or there is water in the transmission oil (refer to the testing procedures described in chapter 1).
- e) Vehicle speed sensor connector: replace the O-ring located where the sensor interfaces with the transmission housing (see _ chapter 6).