Fiat 1996 Brava Service Manual page 501

Auto transmission and differential Bravo-Brava ig|i
6
v
Components and operation
21-27.
N-D change with pitch control (squat)
When the selector lever is moved from position N to position D, the control module temporarily engages
2nd gear, and thenn changes to 1 st gear. In this way the jolt caused by the engagement of 1 st gear and the
resulting pitching movement of the vehicle are reduced.
This function only intervenes if the following condi­
tions arise simultaneously:
- brake pedal pressed (stop lights on);
- throttle valve closed (throttle aperture 0%);
- vehicle speed below 7 km/h;
- driving mode is NORMAL or SPORT;
- when the selector lever is moved from position
N to position D.
Inhibition of reverse gear
With the selector lever at position R, with a vehicle speed of over 7 km/h, the control module sends a sig­
nal to the gear change solenoids (solenoid 1 not activated -OFF- and solenoid 2 activated -ON-) inhibit­
ing reverse gear.
The inhibition of reverse is deactivated in the following cases:
- vehicle speed below 5 km/h;
- selector lever position other than R.
Self-test
The electronic control system constantly monitors the sensors, control solenoids and all the other elec­
tronic components, in order to detect faults and malfunctions immediately; these errors are memorized in
the control module and can be read using the FIAT/LANCIA Tester.
Error detection conditions
The control module can detect errors in the various components only under particular conditions. With
the ignition set to ON or START, and in all other conditions, the following errors can be detected:
- error in gear change solenoid S1;
- error in gear change solenoid S2;
- error in lock-up clutch control solenoid SL;
- error in pressure control solenoid STH;
- error in selector lever position sensor;
- error in throttle position sensor;
- error in kick-down switch;
- error checking transmission of driving torque reduction signal;
- error in gearbox oil temperature sensor when it still indicates an oil temperature of below 10°C after
the engine coolant has reached 75°C.
With the engine running, the following are detected:
- error in battery voltage;
- error in coolant temperature sensor after a period of 10 minutes.
N-D
4 3
3"
93
i."
2 a
1 3
t
24 Publication no. 506.670/06