Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2007HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMALFUNCTION INDICATOR LAMPTESTING AND INSPECTION
2007 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Malfunction Indicator Lamp: Testing and Inspection
2007 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Testing and Inspection
MIL Circuit
DESCRIPTION
The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction. The instrument panel IG2 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 switch is first turned to the ON position. If the MIL is always ON or OFF, use the intelligent tester or OBD II scan tool and follow the procedures to determine the cause of the problem.
INSPECTION PROCEDURE
HINT: Troubleshoot each trouble symptom in accordance with the chart.
DESCRIPTION
The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction. The instrument panel IG2 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 switch is first turned to the ON position. If the MIL is always ON or OFF, use the intelligent tester or OBD II scan tool and follow the procedures to determine the cause of the problem.
Wiring Diagram:
Step 1-4:
Step 4(continued):
INSPECTION PROCEDURE
HINT: Troubleshoot each trouble symptom in accordance with the chart.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.