Corolla LE Sedan L4-1.8L (1ZZ-FE) (1999)
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Malfunction Indicator Lamp: Description and Operation
OBD II regulations require that the vehicle's on-board computer lights up the Malfunction Indicator Lamp (MIL) on the instrument panel when the
computer detects a malfunction in the computer itself or in drive system components which affect vehicle emissions.
In addition to the MIL lighting up when a malfunction is detected, the applicable Diagnostic Trouble Code (DTC) prescribed by SAE J2012 are recorded
in the ECM memory.
If the malfunction does not reoccur in 3 trips, the MIL goes off automatically but the DTCs remain recorded in the ECM memory.
