User Manual

Chapter 6

BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER

IV - COOLANT TEMPERATURE SENSOR (1220) - FEATURE

A - ROLE

The coolant temperature sensor informs the ECU of the temperature of the

engine coolant.

Role of the injection ECU depending on the information received:

• to adjust the preheating time,

• to adjust the post-heating time,

• to adjusting the starting flow,

• to adjust the idle speed,

• to authorise exhaust gas recycling (EGR),

• to adjust the fuel flow,

• to limit the injected flow if the coolant temperature is critical (anti-boil function),

• to control the operation of the radiator fans,

• to control the coolant temperature gauge on the instrument panel (*),

• to control the warning and pre-warning LEDs (*).

Note: (*) depending on version.

B - DESCRIPTION

Green 2-way sensor.

The sensor consists of a Negative Temperature Coefficient resistor (NTC).

The higher the temperature, the lower its resistance.

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