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 MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMALFUNCTION INDICATOR LAMPTESTING AND INSPECTION
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Malfunction Indicator Lamp: Testing and Inspection
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Testing and Inspection
MIL Circuit
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate malfunction detections by the ECM (Included in HV Control ECU).
By turning the engine switch on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.
The MIL operation can be checked visually: When the engine switch on (IG) is first turned to on, the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the intelligent tester.
INSPECTION PROCEDURE
HINT: Troubleshoot each trouble symptom in accordance with the chart given.
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate malfunction detections by the ECM (Included in HV Control ECU).
By turning the engine switch on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.
The MIL operation can be checked visually: When the engine switch on (IG) is first turned to on, the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the intelligent tester.
Wiring Diagram:
Step 1:
Step 1(continued)-4:
Step 4(continued):
INSPECTION PROCEDURE
HINT: Troubleshoot each trouble symptom in accordance with the chart given.
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.