The transmission design of later models (since 1992) with 4.2L EFI engines differs only in minor modifications of some internal components and larger dimensions of the rotation converter.
The upshift selection on later models is done using a push button built into the selector lever handle. When the button is pressed, the transmission shifts to upshifting fourth gear as the vehicle speed increases. When the button is released, fourth gear is locked. This mode is useful when engine braking is required, or to prevent frequent downshifts from third to fourth gear, such as when driving in busy urban traffic conditions.
The electronic control system consists of an electronic control unit (ECU) that functions in conjunction with a throttle position sensor (TPS), throttle switch, engine speed sensor, speed sensor, vehicle speed sensor, transmission oil temperature sensor, power mode switch, kick-down switch and start enable switch.
If any of the sensors/switches fail, the ECU switches on the emergency mode of the AT operation, in which the car can be driven to the nearest workshop of the manufacturer's dealership for professional repair. At low temperatures of the AT, the transmission oil temperature sensor does not allow the upshift and the rotation converter to be locked.
The power mode switch controls the transmission shift pattern. When the switch is in the AUTO position, the transmission shifts to fourth gear as the vehicle speed increases, which helps reduce fuel consumption. However, under heavy acceleration, the power mode switch indicator light may come on, indicating that the transmission shift pattern has changed to improve engine efficiency. When the switch is in the POWER position, the transmission does not shift to fourth gear, which ensures maximum efficiency under engine braking, such as when going down a steep hill.
The mode switch on later models is installed in the central part of the instrument panel and allows switching between three modes: AUTO, POWER and HOLD. The POWER mode is used during sharp acceleration or during a steep climb. The AUTO position corresponds to the normal fuel-saving mode. Setting the HOLD mode allows you to hold the transmission in the gear selected by the selector lever (I, II, III or OVERDRIVE (increasing)).
The hydraulic transmission fluid circulates through an oil cooler located in the radiator. The oil cooler is connected to the transmission via tubes. The transmission fluid level is monitored using a dipstick located on the right side of the engine compartment.
The transmission is removed from the vehicle as a whole after preliminary removal of the transfer case.
Note. Since detailed diagnostics and major repairs of AT require highly qualified personnel and special equipment, the authors of this Manual recommend that, in addition to those listed in the Section dedicated to diagnostics of malfunctions vehicle, contact the workshop of the manufacturer's dealership.
The procedures for removing and installing the transmission assembly (for example, for the purpose of delivery to a workshop for repair or replacement) are described in this Chapter.