System Description

Diagram:

DESCRIPTION
The barometric pressure sensor installed on the volume air flow sensor senses the barometric pressure and converts it into a voltage which is sent to the engine control module.
The engine control module uses this signal to compute the altitude at which the vehicle is running and corrects the air-fuel ratio and the ignition timing, thus improving driveability at high altitude.

TROUBLESHOOTING HINTS
1. If the barometric pressure sensor is faulty, the vehicle will experience poor driveability.
2. If the pressure of the barometric pressure sensor drops greatly during high speed driving, check the air cleaner for clogging.