Bosch 2008 - Manual (Page 42)

A 40 | Gasoline injection components
Bosch Automotive Aftermarket 2008 | 2009
Lambda sensors
Systems:
All
Purpose:
With older systems, the Lambda sensor is installed upstream of the catalytic converter. The
sensor measures the oxygen content of the exhaust gas and supplies the electronic control unit
with a voltage of approx. 800 mV for a rich mixture (λ 1). Modern systems require two Lambda
sensors – one upstream of the catalytic converter (= Lambda control sensor) and one down-
stream (= Lambda diagnosis sensor). Increasing use is being made of planar sensors. These
attain the necessary operating temperature after just a few seconds. To permit lean operation
of the engine, the sensor upstream of the catalytic converter must be capable of detecting a
lean mixture composition. Use is made of the latest broadband sensors for this purpose. These
play a crucial part in reducing emissions in the critical warm-up phase and thus ensure com-
pliance with the EURO IV and ULEV (Ultra Low Emission Vehicle) emission specifications.
Note:
Recommended torque: 40 – 60 Nm
Part number:
Unheated: 0 258 001 ..., 0 258 002 ...
Heated: 0 258 003 , 0 258 005 ...
Planar: 0 258 006 ..., 0 258 007 ..., 0 258 010 ... and 0 258 017 ...
Pedal-travel sensor/accelerator-pedal module
Systems:
Motronic with ETC
Purpose:
In contrast to conventional engine-management systems, with the EGAS Motronic the driver’s
acceleration input is no longer relayed to the throttle valve via a cable. Instead, the input is
detected using a pedal-travel sensor (also referred to as “electronic throttle control”) and
transmitted to the electronic control unit. The accelerator-pedal module is a pre-assembled unit
containing a vehicle-specific foot plate and the pedal-travel sensor. The Motronic ECU evaluates
the sensor signal and adjusts the electric motor-driven throttle valve (throttle device or EMS
positioner) taking into account other vehicle and engine data.
Part number:
0 205 001 ..., 0 280 752 ..., 0 280 755 ...
Pressure damper
Systems:
D, L, LH, K, KE-Jetronic, Motronic
Purpose:
The opening and closing of the injectors and the cyclic delivery action of fuel pumps cause
fluctuations in fuel pressure. These may be transmitted to other components and the body and
result in noise. The pressure damper smoothes the pressure peaks and is primarily designed
to reduce noise.
Part number:
0 280 161 ...