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.
2009 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE
Mass Air Flow Meter: Inspection
- INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
- Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass airflow meter shown in the illustration.
OK:
There is no foreign material.
- Check the intake air temperature sensor (Built into the MAF meter).
- Measure the resistance according to the value (s) in the table below.
Standard resistance
STANDARD RESISTANCE SPECIFICATIONTester Connection Condition Specified Condition 5 (THA) - 4 (E2) -20°C (-4°F) 13.6 to 18.4 kΩ 20°C (68°F) 2.21 to 2.69 kΩ 60°C (140°F) 0.49 to 0.67 kΩ If the result is not as specified, replace the mass air flow meter sub-assembly.
- Measure the resistance according to the value (s) in the table below.
- Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass airflow meter shown in the illustration.
Factory Service Tools
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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.