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 MANUALSVOLVO2004V70 L5-2.5L TURBO VIN 59 B5254T2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONMODE 6 DATAMASS AIR FLOW METER (MAF)
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2
Mass Air Flow Meter (MAF)
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2SECTION Mass Air Flow Meter (MAF)
Mass Air Flow Meter (MAF)
The mass air flow (MAF) sensor supplies the engine control module (ECM) with a signal describing the intake air mass.
This information is for instance used to:
- Regulate fuel/air conditions
- Regulate emission
- Calculate torque.
The MAF sensor consists of a plastic housing containing a connector, electronic circuitry and an aluminum heat sink. The MAF sensor measuring device is a heated film mounted in a pipe which is cooled by the intake air to the engine.
The heated film consists of four resistors. The MAF sensor is supplied with battery voltage and has separate power and signal ground points. The sensor signal varies from 0 V to 5 V, depending on the air mass. Voltage increases with air flow.
The ECM will adopt substitute (limp home) values if the MAF sensor signal is missing or faulty.
The MAF sensor is located between the air cleaner cover and the intake air hose.
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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.