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.

2006 Lexus RX 330 FWDFACTORY OEM SERVICE PROCEDURE

Mass Air Flow Meter: Inspection

INSPECT MASS AIR FLOW METER

Output voltage inspection.
1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
2. Connect the position (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
3. Blow air into the MAF meter, and check that the voltage output fluctuates.
Resistance inspection.

Using an ohmmeter, measure the resistance between terminals 4 (THA) and 5 (E2).

Resistance

MASS AIR FLOW METER

Symbols (Terminal No.)	Resistance	Temperature
THA (4) - E2 (5)	13.6 to 18.4 kΩ	-20°C (-4°F)
	2.21 to 2.69 kΩ	20°C (68°F)
	0.493 to 0.667 kΩ	60°C (140°F)

Fig 1: Inspecting Mass Air Flow Meter

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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.