Pressure Sensor

The pressure sensor is integral with the ECU. This sensor provides continuous information regarding air pressure fluctuation to the ECU. The ECU uses this information in controlling air/fuel mixture.

When activated, the solenoid measures ambient barometric pressure from above throttle valve. Ambient barometric pressure changes due to weather and/or altitude. This information is sent to ECU for controlling fuel delivery time.

After a predetermined period of time, solenoid valve is deactivated by ECU and solenoid measures intake manifold pressure below throttle valve. The ECU compares barometric pressure to intake manifold pressure and an absolute value is used to determine fuel delivery and ignition timing.

The pressure sensor is also used to inform the ECU of altitude for system compensation. The ECU calculates air/fuel ratio necessary for engine operation in high altitude areas.