Tacoma Regular Cab 4WD V6-3.4L (5VZ-FE) (1997)
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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 DTC prescribed by SAE J2012 are recorded in the ECM memory.
If the malfunction does not reoccur in 3 trips, the MIL goes off but the DTC remain recorded in the ECM memory.
