Sensors

Sensors

BRAKE PEDAL SWITCH

There is a switch (1) on the brake pedal which operates the brake lights; the same switch sends a signal to pin 2-8 of the injection control unit.

The "brake pedal pressed" signal is used by the control unit:

• for understanding that there is a deceleration situation;
• for checking the plausibility of the signal coming from the accelerator potentiometer.

CLUTCH PEDAL SWITCH

There is a switch (2) on the clutch pedal connected to pin 2-2 of the injection control unit. The "clutch pedal operated" signal is used by the injection control unit to distinguish the gear engaged and gear shift conditions.

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 shows the sensor and the electrical connector with the pin-out:

1. Pressure signal
2. Earth
3. Supply

ATMOSPHERIC PRESSURE SENSOR

The atmospheric pressure sensor is incorporated inside the injection electronic control unit and has the task of measuring the atmospheric pressure in order to correct the air flow rate value measured and the reference air flow rate for controlling the EGR function.