General System

Computerized Engine Control (EGI):

The computerized engine control system is the central control for electronic gasoline injection (EGI), electronic spark advance (ESA), idle speed control (ISC), turbocharger control, and exhaust gas recirculation (EGR) function. The control system does this by monitoring vehicle operating conditions like engine knock, brake light switch position, exhaust gas recirculation valve position, electrical load, power steering pressure, air conditioning operation, exhaust oxygen content, coolant temperature, barometric pressure, intake air temperature, throttle position, intake air volume, and engine speed.
The computerized engine control system also contains a self diagnostic function. The self diagnostic function constantly monitors input signals and will illuminate the Malfunction Indicator (CHECK) Light if it discovers an error. The light can also be used to extract trouble codes from the computer system.