Fiat 1996 Brava Service Manual page 502

Bravo-Brava !@i
16v
Auto transmission and differential
Components and operation
21-27.
With the vehicle moving, the following are detected:
- error in main shaft rpm sensor;
- error in vehicle speed sensor;
- error in transmission ratio, when the ratio between the main shaft rpm and vehicle speed differs for
more than one second from the memorized transmission ratios;
- error in gearbox mechanism, when the gear change time exceeds 1.3 seconds or when the change
down to a lower ratio is effected at a higher speed than the maximum permitted speed.
Memorization of errors
In the case of significant faults, the red warning light (1) on the instrument panel comes on.
If the gearbox oil temperature is over 150°C, the red warning light (1) remains permanently on.
P4A25AB01
For each error, the control module memorizes:
- the component which caused the error (e.g. pressure control solenoid);
- the classification of the error (Present or Intermittent);
- the type of error (A.C./D.C. GND/D.C. Vbatt/etc).
Error deletion
The errors memorized by the control module can be deleted by active diagnosis with the FIAT/LANCIA
Tester or by disconnecting the battery for over 10 seconds.
Recovery strategies
If the control module detects a fault, the red warning light on the instrument panel flashes to warn the
driver and, at the same time, the appropriate recovery strategy is activated to allow the car to reach the
nearest Authorized Garage.
Main components
If the control module has memorized one of the following errors:
- errors in gear change solenoids S1 or S2;
- error in pressure control solenoid STH;
- error in selector lever position sensor;
- error in throttle position sensor;
- error in main shaft rpm sensor;
- error in vehicle speed sensor;
- error in transmission ratio;
- error in checking transmission of driving
torque reduction signal;
- error in battery voltage;
- error in gearbox mechanism;
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