Recovery

Recovery

The potentiometer emergency/safety function is activated when faults prevent the ECU from measuring the actual throttle openng angle (α).

• when race 1 of the potentiometer is faulty, predefined safety injection times and ignition advances are set. The idle regulation motor is set to an emergency position.
• when race 2 is faulty, only a safety injection time and a safety ignition time are set.
• when synchronisation is faulty, the last data item saved is set as the offset between both races.

Direct current motor for idle speed control

Idling rpm level is adjusted automatically by the ECU through a 12 V direct current electric motor (A). This acts directly on linkage (B) of the throttle control valve through a reduction system.

The throttle opening motor incorporates a microswitch (C), which is closed when the accelerator pedal is at rest (released).

Contact closure activates the two-fold CUT-OFF function during over-run and automatic idle adjustment.

Injection pulses are restored after a period of CUT-OFF and idle speed regulation is activated by the ECU (A see figure overleaf), mainly on the basis of rpm and coolant temperature.

The electronic system is also able to take into account other parameters, namely: engine in start-up or or warm-up mode, air conditioner activated.

The idle control function is activated by closure of contact (C see figure overleaf) which connects terminal 3 of the ECU to earth through terminals 3 and 4 of the connector of motor (B) at point (I).

Whenever necessary, the ECU supplies regulation motor (D) through terminals 29 and 31 so that the throttle valve opens and closes to correct idle speed.

An electronic switch inside the ECU reverses motor polarity in order to produce two directions of rotation (clockwise and anticlockwise).