Peripherals | 3
Bosch Motorsport
Engine Control Unit MS 25 Sport
33 / 40
3 Peripherals
Sensors and peripherals can be checked when the system is powered up electrically using
the Engine On -switch.
CAUTION
Do not start the engine before all steps in this chapter are com-
pleted.
Make sure the battery is connected properly, all sensors are connected, and ground wiring
is fixed before powering up the system. Check all sensors for errors (E_...) and reliable
measure values before starting the engine.
APS safety
– Acceleration pedal and its position sensor is the main request for engine torque (in-
jection quantity) in common rail Diesel engines. As this is considered drive-by-wire
system safety features have been introduced on the MS 25 Sport ISAPS function.
– APS has to have two signals, main pedal signal 1 and redundant signal 2 with 0.5
scale.
– Calculated difference of pedal signal 1 voltage – 2*pedal signal 2 voltage has to be
below 0.5 V or less than UAPS_CM_MAX
Analog sensor inputs
Inputs with fixed pull-up resistors are prepared to handle passive sensor elements, for in-
stance temperature sensors with integrated resistors (NTC- or PT100 sensors). Inputs
without any pull-up resistors are prepared to handle active sensor elements, which deliver
0 to 5 V signals, for instance pressure-, potentiometer- or acceleration sensors. Each
sensor input is mapped clearly for pressure or temperature measurement in the pinout
and the only exception is exhaust gas temperature, where only 0 to 5 V output sensors are
supported.
Error detection of an analog input signal detects short circuits to ground, U”function”_MIN
recommended to be set to 0.2 V, and short circuits to power supply, U”function”_MAX re-
commended to be set to 4.8 V. Failures are activated after the adjustable debounce time
of diagnosis TD”function”. If a sensor error is set, the output is switched to the default
value “function”_DEF.
Pressure measurements
The system offers many different pressure channels, please see function description Input
Signal Processing for details. For gradient and offset information please contact the
sensor manufacturer.
