280ZX L6-2753cc SOHC Turbo (L28ET) (1983)
Altitude Switch: Description and Operation
Electronic Concentrated Engine Controls (ECCS-Turbo)
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.
Altitude Switch
This switch, used on some models, is attached on the left side of the instrument panel in the driver's compartment. This switch consists of a bellows
and a microswitch. The switch transmits an ``On'' or ``Off'' signal to the control unit according to change in atmospheric pressure. When the atmospheric
pressure drops below 26 in. Hg, an ``On'' signal is transmitted to decrease fuel by 6%.