Removal/refitting

IMPORTANT: The air flow meter cannot be disassembled.

The operating principle consists of a heated membrane film in a measuring duct through which the engine intake air flows.

The film is maintained at constant temperature (approximately 120°C warmer than the intake air temperature) by a resistance.

The air flow in the duct tends to take heat from the film.

Consequently, a certain current is required by the resistance to keep the temperature.

This current is measured by means of a Wheatstone jumper and is proportional to the air flow.

This air flow meter directly measures the air mass (and not volume) thus eliminating problems related to temperature, altitude, pressure, etc.

1. Loosen the fastening clips and remove the upper resonator.

REMOVAL/REFITTING

• Make sure the ignition key is at "STOP" and disconnect the (-) battery terminal.

1. Loosen the screws and remove the engine compartment side guard.

1. Disconnect the hot film flow meter electrical connection.
2. Release the corrugated sleeve elbow fastening button from the resonator.