Contents: 27 Unsatisfactory operation of the… ↧ 28 When the accelerator pedal is… ↧ 29 There is slippage in the gearbox,… ↧ 30 Transmission fluid leak occurs ↧
Note: Due to the complexity of the automatic transmission design, its diagnostics and repair are beyond the capabilities of an amateur mechanic. If any faults are detected, the method for eliminating which is not described below, the vehicle should be taken to a company or specialized station.
27 Unsatisfactory operation of the gear shift mechanism is noted
1. In Chapter 7A describes the procedures for checking and adjusting the automatic transmission gear shift mechanism. Incorrect adjustment leads to the following malfunctions:
- a) Starting the engine in gears other than "Park" or "Neutral".
- b) Discrepancy between the gear engagement indicator on the instrument panel and the gear actually engaged.
- c) The vehicle is moving while the "Park" mode is engaged.
2. Adjust the cable as described in Chapter 7A.
3. Malfunction of the solenoid valve of the switching mechanism. Check diagnostic trouble codes (chapter 6).
28 When the accelerator pedal is pressed, the gear does not downshift
Malfunction of the transmission hydraulic system control solenoid valve. Check diagnostic trouble codes (chapter 6).
29 There is slippage in the gearbox, 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 inspection procedure that is within the competence of a car mechanic is checking the transmission fluid level.
2. Before contacting the station, check the condition and level of 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. Gear shifting with a delay, which is accompanied by rigidity, may occur due to the failure of the control solenoid valve of the transmission hydraulic system. Check diagnostic trouble codes (chapter 6).
30 Transmission fluid leak occurs
1. Transmission fluid is dark red in color. Traces of transmission fluid leakage should not be confused with traces of engine oil, which may be carried onto the gearbox by the air flow while the car is moving.
2. To determine the source of the leak, clean the gearbox casing and the surrounding area. Use degreasers or a steam cleaner. After cleaning, drive at low speed so that the fluid is not carried away by the wind flow from the source of the leak. Raise the vehicle and determine the source of the leak. Typically, these are the following elements.
- a) Oil pan: tighten the mounting bolts and/or, if necessary, replace the oil pan gasket (see chapter 1).
- b) Filler tube: Replace the rubber seal located at the junction of the tube with the gearbox housing.
- c) Transmission hydraulic system oil lines: tighten the couplings connecting to the gearbox casing and/or replace the oil lines.
- d) Vent tube: The transmission is overfilled and/or there is water in the transmission oil (see the inspection procedures described in chapter 1).
- e) Vehicle speed sensor connector: Replace the sealing ring located where the sensor mates with the transmission housing (see chapter 6).
(The material was created based on information from the website «CHEVYMAN.RU»)