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Gasoline injection components | A31
2008 | 2009 Bosch Automotive Aftermarket
Air-mass meter
System:
LH-Jetronic, Motronic
Purpose:
The air-mass meter is installed between the air filter and the throttle valve and measures
the intake-air mass. Use is made in practice of hot-wire and hot-film air-mass meters. Both
sensors operate on the same principle: An electrically heated thin platinum wire or platinum
film resistor is positioned in the intake-air flow together with a temperature sensor in the form
of a temperature-sensitive resistor. The electronic control unit is supplied with a voltage signal
proportional to the air mass flow and uses this signal to calculate the quantity of fuel required.
Part number:
0 280 21. ...,
BX: 0 986 280 1.. (HLM), 0 986 280 2.. (HFM)
Auxiliary-air device
Systems:
D, L, K-Jetronic, Motronic (some)
Purpose:
The auxiliary-air device is installed in a bypass around the throttle valve. In the warm-up phase,
the engine is supplied with additional air/fuel mixture to ensure stable idling. The auxiliary-air
device is electrically heated and closes the bypass with increasing engine temperature. The
bypass is completely closed off when the engine reaches operating temperature.
Part number:
0 280 140 001 – 0 280 140 299
Camshaft speed sensor
Systems:
Motronic
Purpose:
The camshaft position indicates whether an engine piston moving towards top dead center is
in the compression or exhaust stroke. The speed sensor at the camshaft (also referred to as
phase sensor) passes this information to the electronic control unit. Such sensors are used
where high accuracy is required. Further advantages include a comparatively large air-gap range
and good temperature compensation.
Part number:
0 232 10. ...