Connect GDS to Data Link Connector (DLC).

Warm engine up to normal operating temperature.

Turn "OFF" electrical devices and A/C.

Monitor "ATMOSPHERIC PRESS. SNSR" parameter on the "Current Data" with GDS.

Fig.1) The atmospheric pressure where the vehicle is displayed. Atmospheric pressure decreases as vehicle going up to higher altitude. The pressure at average level of sea surface is regarded as 1atm and, check if the pressure different from 1 atm is displayed. (1 atm is correct pressure)