Excess Pressure Sensor; Atmospheric Pressure Sensor - Fiat 1998 Marea Service Manual

Engine
Fuel system
CLUTCH PEDAL SWITCH
There is a switch (2) on the clutch pedal connected to pins 2-2 of the injection control unit.
The "clutch pedal operated" signal is used by the injection control unit to distinguish between gear en-
gaged and gear change conditions.

ATMOSPHERIC PRESSURE SENSOR

The atmospheric pressure sensor is contained inside the injection electronic control unit and has the task
of measuring the atmospheric pressure in order to correct the air flow rate values measured and the refer-
ence values for controlling the EGR function.
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Marea- Marea Weekend ©

EXCESS PRESSURE SENSOR

This sensor is fitted on the inlet manifold and
the signal transmitted to the injection control
unit is used for:
- regulating the injection pressure;
- regulating the duration of the injection.
The diagram at the side illustrates the sensor
and the electrical connector with the pin out:
1. Pressure signal
2. Earth
3. Supply
4F016NJ02
BRAKE PEDAL SWITCH
There is a switch (1) on the brake pedal
which operates the brake lights; the
same switch sends a signal to pins 2-8
of the injection control unit.
The "brake pedal pressed" signal is used
by the control unit for:
understanding that there is a decelera-
tion situation;
checking the plausibility of the signal
coming from the accelerator potenti-
ometer.
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99 range
Print n° 506.763/14