Fast idle management

By means of information relating to the engine speed/TDC, accelerator lever position, atmospheric pressure, temperature of the intake air and temperature of the engine coolant, the electronic control unit calculates the optimum injection advance value and compares it with the actual value transmitted by the instrument injector and, if necessary, it operates the advance actuator solenoid valve so that the start of the injection always takes place at the most appropriate moment for all engine operating conditions.

1. Electronic control unit
2. Accelerator lever position sensor
3. Instrument injector
4. Air temperature sensor
5. Engine rpm sensor
6. Coolant temperature sensor
7. Advance actuator solenoid valve
8. Atmospheric pressure sensor

FAST IDLE MANAGEMENT

The engagement of the fast idle function is implemented by the control unit when at least one of the following conditions prevail:

1. intake air temperature below 25 °C and engine coolant temperature below 55 °C;
2. air conditioning compressor on;
3. engine speed below 750 rpm.

1. Electronic control unit
2. Air conditioning
3. Air temperature sensor
4. Engine rpm sensor
5. Coolant temperature sensor
6. Fast idle valve