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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSSFI SYSTEMMASS AIR FLOW (MAF) METERINSPECTION
2004 Toyota Celica GT, Standard
Mass Air Flow (MAF) Meter: Inspection
2004 Toyota Celica GT, StandardSECTION Inspection
- INSPECT MAF METER RESISTANCE
Using an ohmmeter, measure the resistance between terminals THA and E2.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Resistance:
If the resistance is not as specified, replace the MAF meter.
- INSPECT MAF METER OPERATION
- Connect the MAF meter connector.
- Turn the ignition switch to ON.
- Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
- Blow air into the MAF meter, and check that the voltage fluctuates.
If operation is not as specified, replaced the MAF meter.
- Turn the ignition switch LOCK.
- Disconnect the MAF meter connector.
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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.