Highlander 4WD V6-3.3L (3MZ-FE) (2004)
Malfunction Indicator Lamp: Testing and Inspection
MIL CIRCUIT
CIRCUIT DESCRIPTION
The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction. The instrument panel GAUGE fuse provides
circuit power and the ECM provides the circuit ground that illuminates the MIL.
MIL operations should be checked visually:
The MIL should be illuminated when the ignition is first turned on. If the MIL is always ON or OFF, use the hand-held tester or OBD II scan tool and
follow the procedures to determine the cause of the problem.
Wiring Diagram