Recovery strategies

RECOVERY STRATEGIES

If a problem is detected with the sensors/ actuators the control unit, where possible, replaces the missing data, reconstructing it using software (recovery) to allow 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 with the engine started up, it stays operating.

Air flow meter

recovery: the air flow 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 valve 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 with 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.