Safety Control Unit - Fiat Bravo Service Manual

Bravo-Brava
R e v e r s e (selector lever on position R)
The gearbox input shaft E rotates in a clockwise direction.
The sun gears S1 and S 2 are coupled by the input shaft E, by the engagement of the multiple disc clutch
C 2
The clutch C 3 locks the free wheel FO and couples the crownwheel K1 to the clutch carrier drum D.
The crownwheel K2 is locked to the gearbox casing via the multiple disc brake B 2 .
The brake B2 locks the free wheel F 1 .
The sun gear S 2 , coupled to the input shaft E, transmits motion anti-clockwise to the planet gears S T 2
and clockwise to the planet gears S T 3 .
The planet gears S T 3 , rotating clockwise, shift onto the locked crownwheel K 2 , thus making the gear
train carrier T1 and gear II rotate anti-clockwise, obtaining reverse gear.
S A F E T Y CONTROL UNIT
The safety functions of the AISIN automatic transmission are managed by a special electronic control
unit and may be divided into t w o categories:
1. warning functions, which cause a buzzer to sound when:
- the selector lever is shifted to position R;
- a front door is opened when the selector lever is at a position other than P;
- the engine is switched off w i t h the selector lever in a position other than P;
2. functions which oblige the driver to carry out particular actions to allow:
- the selector lever to be moved from position P with the engine running only w i t h the brake pedal
pressed;
- the ignition key to be withdrawn only with the selector lever in position P.
Copyright Fiat Auto
Auto transmission and differential
ftiev
Components and operation
P4A13AB01
21-27.
13