Mirage L4-1597cc 1.6L SOHC Turbo (1985)
Barometric Pressure Sensor: Description and Operation
The pressure sensor, installed on the firewall, senses ambient barometric pressure and absolute pressure in the intake manifold. Ambient barometric
pressure is sensed by the sensor energizing the solenoid valve by the ECU for a pre-set time period immediately after engine starting and thereafter once
every time period. Ambient pressure information is sent to the ECU for controlling fuel delivery time. During times when barometric pressure is not
being sensed, the solenoid valve is de-energized and the sensor detects intake manifold pressure. This information is sent to the ECU for controlling fuel
delivery time and idle speed.
