Civic Sedan L4-1590cc 1.6L SOHC (D16A6) MFI (1990)
Check Engine/PGM-FI Warning Lamp: Description and Operation
The ECU illuminates the "CHECK ENGINE" warning light, located on the instrument panel above the tachometer, if a problem is detected in any of
the monitored systems. This light is the primary means of notifying the driver that a problem exists. The ECU also stores a trouble code in erasable
memory, and flashes the LED on the ECU at the same time.