This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant "cold wire''.
A faulty MAF sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
- A no start condition
- Stalls at idle
- Surging idle
- Extended crank time when engine is cold
- Poor fuel economy
- With the engine running at idle, use a DVOM to verify that there are at least 10.5 volts between terminals A and B of the MAF sensor connector. Such a reading indicates that the power input to the sensor is correct. Then, measure the voltage between MAF sensor connector terminals C and D. If the reading is approximately 0.34–1.96 volts, the sensor is functioning properly.
REMOVAL & INSTALLATION
The mass air flow sensor hot wire sensing element and housing are calibrated as a unit and must be serviced as a complete assembly. Do not damage the sensing element, or possible failure of the sensor may occur.
- Disconnect the negative battery cable.
- Disengage the wiring harness connectors from the IAT and MAF sensors.
- Loosen the engine air cleaner outlet tube clamps, then remove the tube from the engine.
- Remove the MAF sensor from the air cleaner assembly by disengaging the retaining clips. To remove the MAF sensor, disconnect the PCV system hose from the air cleaner outlet tube . . .
- Install the MAF sensor to the air cleaner assembly and ensure that the retaining clips are fully engaged.
- Install the air cleaner outlet tube, then tighten the outlet tube clamps until snug.
- Attach the engine wiring harness connectors to the IAT and MAF sensors.
- Connect the negative battery cable.
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