Alfa Romeo 159 Training Material page 96

ENGINE
ELECTRICAL SPECIFICATIONS:
SENSOR FEATURES
OUTPUT SIGNAL TYPE
MEASURING METHOD
High pressure fuel sensor
FUNCTION: To measure the fuel pressure in the rail by sending a feedback signal to the
injection ECU to control injection pressure and duration.
FEATURES: This is piezoelectric pressure sensor consists of a mixed metal and plastic
body. The metal part comprises a diaphragm pressure gauge, a plastic part and a 3-pin
connector (one for power, one for signal to ECU and one for ground).
The sensor connections to the engine ECU are:
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
5V power from the ECU
Variable voltage signal in time, maximum value and
frequency according to pulse waveform (square wave)
when sensor meets phonic wheel teeth. Two long teeth
are followed by two short teeth.
The ECU must be powered to pick up the output signal.
Examiner with SAM (Examiner Smart) module is needed
to view the signal, considering its type. Set Examiner as a
voltmeter and acquire the signal for approximately 5
seconds.
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