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2 | Starting up the ECU
2.4.4 Torque and Fuel System
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2.4.3.5 Pressure Control Valve PCV and 2-Actuator RPC Concept
In the case of a 2-actuator rail pressure control concept, pressure control valve calibration
is needed. Incorrect calibration of pressure control valve can make rail pressure control
RPC unstable and it is important to ensure that pressure control valve closing current is
sufficient for used rail pressure range to keep the valve closed during normal operation.
2.4.4.1 Accelerator Pedal Sensor APS
The accelerator pedal signal is a direct input for the drivability base map, which scales the
aps signal for driver requested torque into a percentage of the maximum limited torque,
specified as injection quantity from curve CL_QTLIM. Before starting any new engine and
application accelerator pedal position sensor signal has to be learned to achieve the range
from 0 to 100 % of torque request from the pedal. 0 and 100 % pedal positions are
learned with calibration trigger CWAPSADJ and after successful learning an ECU power
cycle is needed with a complete shutdown sequence (Engine On –switch off, wait 30 sec)
to store the learned values in the EEPROM.
CWAPSADJ=0 no action
CWAPSADJ=1 Calibrate first point (0 %)
CWAPSADJ=2 Calibrate second point (100 %)
Engine Control Unit MS 25 Sport
Bosch Motorsport
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