Description

DESCRIPTION

The Fiat Brava 1581 16v Torque uses an AISIN 60-40 LE automatic gearbox and differenetial unit, 4-speed version AW 596/Y024, specially designed for front-wheel drive vehicles with transverse-mount-ed engine, fitted with an electronic control system connected to the engine management control unit.

1. Gearbox-differential unit
2. Selector lever
3. Control module

The automatic transmission electronic control logic resides in an "intelligent" control unit (or control module), located under the cushion of the rear seat on the right.

The control module is connected to the various sensors/actuators located on the gearbox, engine and dashboard, the control unit of the fuel injection/ignition for exchanging information relating to the en-gine and the instrument panel for displaying the operating conditions.

The mechanical unit of the automatic transmission comprises:

• an oleodynamic torque converter, with a lock-up clutch which locks the converter in the higher ratios;
• two epicyclic gears, located on the main shaft;
• a band brake B1, a multiple disc brake B2 and four multiple disc clutches, operated hydraulically; there are also two free wheels, which lock the various gearing components to obtain the four forward gears and reverse gear;
• a parking lock, consisting of a gear with ratchet gear which locks the gearbox when the gear lever is in the P (Park) position.

The control module interacts in the hydraulic operation of the gearbox, issuing the appropriate operating commands to the clutches and brakes via four solenoids, contained in a valve unit located at the front of the automatic transmission.