The MAF sensor controls the temperature of the heating resistor by means of a variable voltage so its temperature is 320°F (160°C) above the intake air temperature which is detected by the temperature resistor. The temperature of the heating resistor is detected by the sensor resistor. If a temperature change occurs as a result of an increased or decreased air flow, the PCM adapts the voltage at the heating resistor until the temperature difference is again achieved. This control voltage is used by the PCM as a measure for the metered mass. The intake air temperature is detected by an additional Negative Temperature Coefficient (NTC) resistor.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
- Disconnect the negative battery cable.
- Remove the engine cover.
- Disconnect the sensor electrical connector.
- Remove the vent hose.
- Disengage the lock ring that attaches the sensor to the intake by inserting a suitable tool into the locking ring and moving the tabs on the intake away from their locked position.
- Press the locking tab on the bottom right of the sensor down, using a suitable tool thereby unlocking it from the intake.
- Press the locking tab on the upper left of the sensor upward with a suitable tool, unlocking it from the intake manifold.
- Remove the sensor from the intake manifold.
- Installation is the reverse of the removal procedure.
- Inspect the sealing ring, replace if necessary.
- Inspect the sealing ring between the air inlet and the sensor, replace if necessary.
- Inspect the locking tabs, replace if necessary.