Ecu pin-out

ECU PIN-OUT

connector A

connector B

Self-test

By means of a specific sensor control logic and actuator self-adjustment, the ECU memorises and stores the failures and faults occurring in the system.

When the key is turned to MAR, if the ECU has recorded errors, the climate control ON LED flashes.

The memorised errors can be accessed by means of the Examiner or other diagnostic tool. If the error refers to one of the sensors, the ECU continues to operate ensuring “manual” system operation (for example, by moving the mixing flap by one step for each notch of the command lever). Each time the key is turned to MAR, the ECU moves the mixing actuator and the distribution actuator to read the extreme positions: if this operation is not successful, an error signal is issued. The re-circulation flap actuator is not, however, equipped with a feedback potentiometer and, therefore, an error is issued if a block or obstacle occurs during the movement causing faulty current absorption.

SYSTEM COMPONENTS

CONVEYOR UNIT/DISTRIBUTOR

The electric fan conveys the external air flow towards the inside of the vehicle. If the re-circulation function is activated, the relative slot however conveys the air flow from the inside of the compartment. Initially the air reaches the evaporator, then - partially or totally - the heating radiator, according to the position of the mixing slot. Finally the air is sent to the various vents, according to the position of the upper, central and lower distribution flaps.

All the flaps are operated by electric motors driven by the ECU.