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 MANUALSLEXUS2004LX 470 V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORTESTING AND INSPECTION
2004 Lexus LX 470 V8-4.7L (2UZ-FE)
Air Flow Meter/Sensor: Testing and Inspection
2004 Lexus LX 470 V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECTION
1. DISCONNECT MAF METER CONNECTOR
2. REMOVE MAF METER
Remove the 2 screws and MAF meter.
3. INSPECT MAF METER
a. Using an ohmmeter, measure the resistance between terminals THA and E2.
If the resistance is not as specified, replace the MAF meter.
b. Inspect for operation.
1. Connect the MAF meter connector.
2. Connect the negative (-) terminal cable to the battery.
3. Turn the ignition switch ON.
4. Using a voltmeter, connect the positive (+) tester probe to terminal VG and negative (-) tester probe to terminal E2G.
5. Blow air into the MAF meter, and check that the voltage fluctuates.
If operation is not as specified, replace the MAF meter.
6. Turn the ignition switch OFF.
7. Disconnect the negative (-) terminal cable from the battery.
8. Disconnect the MAF meter connector.
4. REINSTALL MAF METER
Install the MAF meter with the 2 screws.
Torque: 1.68 N.m (17 kgf.cm, 15 in.lbf)
5. RECONNECT MAF METER CONNECTOR
1. DISCONNECT MAF METER CONNECTOR
2. REMOVE MAF METER
Remove the 2 screws and MAF meter.
3. INSPECT MAF METER
a. Using an ohmmeter, measure the resistance between terminals THA and E2.
If the resistance is not as specified, replace the MAF meter.
b. Inspect for operation.
1. Connect the MAF meter connector.
2. Connect the negative (-) terminal cable to the battery.
3. Turn the ignition switch ON.
4. Using a voltmeter, connect the positive (+) tester probe to terminal VG and negative (-) tester probe to terminal E2G.
5. Blow air into the MAF meter, and check that the voltage fluctuates.
If operation is not as specified, replace the MAF meter.
6. Turn the ignition switch OFF.
7. Disconnect the negative (-) terminal cable from the battery.
8. Disconnect the MAF meter connector.
4. REINSTALL MAF METER
Install the MAF meter with the 2 screws.
Torque: 1.68 N.m (17 kgf.cm, 15 in.lbf)
5. RECONNECT MAF METER CONNECTOR
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.