Gear Change Solenoids; Lock-Up Control Solenoid; Kick-Down Switch; Gearbox Sensors/Actuators Connector (View Of Contact Side) - Fiat Bravo Service Manual

Auto transmission and differential
Description and operation
21-27.
The recovery stragegy involves the deactivation of all the solenoids, so no automatic gear changes are ef-
fected, the torque converter is not locked and the hydraulic pressure is not varied.
The vehicle can travel because each position of the selector lever corresponds to the engagement of a par-
ticular transmission ratio, by the movement of the hydraulic distributor.
Selector lever position
Gear engaged

Lock-up control solenoid

In the case of error, the torque converter locking function is disabled.
Coolant temperature sensor
In the case of error, a substitutive value of 75°C is assigned.

Kick-down switch

In the case of error, it is considered ON if the throttle valve aperture is greater than 73.5%, OFF if it less
than 70%.
°nl—L
IS.
8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
• • D • D • •
Gearbox sensors/actuators
(view of contact side)
The resistance of the gear change solenoids
S1 and S2 can be measured by disconnect-
ing the connector and connecting an o h m -
meter as shown in the figure.
R e s i s t e n c e : 13 ± 2 o h m at 20 C
26
R
Reverse
L 2 6 L 1 3
connector
Bravo-Brava
D 3
4th 4th
G E A R CHANGE S O L E N O I D S
The gear change .solenoids S1 (A) and S2
(B) are located at the front of the gearbox
and they manage the gear changes. The
solenoids are actually normally closed (N.C.)
electrovalves w h i c h , receiving a signal from
the control module, change their position to
allow the engagement of the different trans-
mission ratios, in accordance w i t h the f o l -
lowing table.
Gear Solenoid S1
1st
2nd
3rd
4th
P4A26AB03
ft**
2 1
3rd 1st
Solenoid S 2
ON
OFF
ON
ON
OFF
ON
OFF
OFF
Publication no. 506.670/06