Fiat Bravo Service Manual page 229

Bravo-Brava @ ^ Engine
Fuel system
10.
RECOVERY STRATEGIES
if a problem is detected with the sensors/ actuators the control unit, where possible, replaces the miss­
ing data, reconstructing it using software (recovery) to alicw the operation of the engine.
For the sensors/actuators not mentioned in the list below, there is not type of recovery.
Engine timing sensor
recovery: the engine cannot be started up, however if the problem occurs w i t h the engine started up, it
stays operating.
Air flow meter
recovery: the air f l o w rate is calculated on the basis of the butterfly position and rotation speed values.
additional provisions: self-adjustment of the mixture strength and idle disabled; charcoal filter solenoid
vaive disabled.
Coolant temperature sensor
recovery: during starting T = 20°C; otherwise T = 20°C increased by 1 °C every 6 seconds until reaching
80°C; during starting or w i t h the key in the OFF position the radiator fan is off, otherwise it is activated.
additional provisions: self-adjustment of mixture strength and idle disabled.
Butterfly position sensor
recovery: fixed butterfly angle = 7°; if the engine load (TP) is below 1.75 ms and the speed is below
1000 rpm, then the engine is idling, otherwise it is outside of idling.
additional provisions: self-adjustment of idling disabled.
Vehicle speed sensor
recovery: speed = 0.
additional provisions: self-adjustment of idling disabled.
Lambda sensor
recovery: the reading of the sensor voltage is disabled (open-loop).
Detonation sensor
recovery: the "basic" advance is reduced by an average of 5° if the engine load TP is above 2.5 ms.
Engine idle speed adjustment solenoid valve
recovery: the valve is kept open at a pre-set value.
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