Function

Function

This sensor (30) notifies the control unit of the temperature of the engine coolant.

Depending on the information received, the injection control unit:

• regulates the pre-heating temperature
• regulates the post-heating temperature
• authorizes the recirculation of the exhaust gases (EGR)
• controls the fans
• controls the indicator in the instrument panel (depending on the version)
• controls the alarm and pre-alarm warning lights (depending on the version).

Description

The sensor consists of and NTC type thermistor (Negative Temperature Coefficient), whose electrical resistance decreases as the temperature increases).

Electrical specifications: resistance at 20°C = 6245 Ohm.

Location

The engine coolant temperature sensor is located on the thermostat.

VEHICLE SPEED SENSOR

Function

This sensor (26) informst the engine management control unit of the vehicle's speed. Depending on the information received, the engine management control unit:

• determines the speed of the vehicle (vehicle stationary or moving)
• determines the gear engaged
• improves the idle speed with the vehicle moving
• improves acceleration
• reduces engine jerking.

Description

The sensor is fitted on the gearbox. It is the Hall effect type:

• 5 signals per metre.
• 8 signals per turn.

Electrical specifications

Destination of the connector contacts:

• pin 1: +12V supply
• pin 2: earth
• pin 3: signal.