Festiva L4-81 1.3L SOHC EFI (1989)
DESCRIPTION AND OPERATION (Continued)
Inputs
Vane Airflow Meter
The vane airflow (VAF) meter detects the intake air quantity and converts the measurement to a voltage reading by means of a potentiometer. The
voltage signal is sent to the ECA, which in turn determines injection quantities based on this signal, engine speed, etc. The voltage increases as the
opening in the measuring plate increases, and decreases as the opening becomes smaller. The meter also incorporates a sensor to detect intake air
temperature and a fuel pump switch to control the fuel pump.
Ignition Coil
The ignition coil sends engine speed information to the ECA.
Vane Air Temperature Sensor The vane air temperature (VAT) sensor is a thermistor. It is mounted inside of the vane airflow meter and senses the
intake air temperature. This information is sent to the ECA for use in calculating fuel injection amount.
1989
24-05-10
Electronic Fuel Injection System
24-05-10
DESCRIPTION AND OPERATION (Continued)
Engine Coolant Temperature Sensor
The engine coolant temperature (ECT) sensor is a thermistor that is mounted into the intake manifold coolant passage. It senses engine coolant
temperature and provides this information to the ECA.
Radiator Temperature Switch