Computers and Control Systems: Application and ID

GENERAL DESCRIPTION
This database contains the Driveability and Emissions system diagnostics for those 1987 vehicles equipped with 2.8L (VIN W) engines using standard and Speed Density fuel control systems. To determine if a vehicle is equipped with a speed density fuel control system, refer to either the upper right hand shock tower and/or the Electronic Control Module (ECM) MEM-Cal access door. If there is no label to indicate that a speed density fuel control system is being used, refer to Air Flow Meter Sensor under Computers and Control Systems, for Mass Air Flow Fuel control system diagnostics.

A second method to determine if the vehicle is using speed density fuel control is by utilizing the "scanner." "Scan" selections will not read data on a speed density vehicle for 1987-1988. Data can be read if 1989 is selected as the model year. PROM ID will match either 1987-1988 GM SPO CAMS/ T-10/ T-15 information for Mass Air Flow or speed density vehicle fuel control. TECH I and CAMS functions, including test directors and automated routines, should be selected according to the fuel control system.

This database combines the 1987 Mass Air Flow original wiring configuration and service bulletins, with the appropriate modifications for the speed density application. Note again that if the vehicle is a speed density configuration, use the 1989 2.8L "Scan" selection. Consult the divisional specific service bulletin for proper MEM-Cal selection.