Pulsar L4-1809cc 1.8L DOHC (CA18DE) (1988)
Altitude Switch: Description and Operation
Altitude Compensation
Altitude compensation prevents deterioration of exhaust emissions caused by an enriched air/fuel mixture.
Atmospheric pressure varies according to the altitude. The higher the altitude, the lower the atmospheric pressure. At an atmospheric pressure of
approximately 26 in. Hg or below, the altitude switch transmits an ``On'' signal to the control unit, decreasing fuel to provide an appropriate air/fuel
mixture ratio.