2753558 - E7020 ABS - Functional description

Functional description

The ABS control unit M050 receives a direct battery supply at pins 2 and 3 and an ignition-controlled supply at pin 18; the lines are protected respectively by fuses F04 and F42, both located in the engine compartment junction unit B001. The brake pedal switch I030 comprises two internal switches, one normally open (N.A.) type and one normally closed (N.C.) type.

In case of braking:

• the ABS control unit M050 (at pin 20) and the body computer node M001 (at pin 5 connector B) receive a positive signal, referred to the line protected by fuse F37 located in the junction unit under the dashboard B002;
• at the engine management control unit M010, at pin 68 connector B, the supply line protected by fuse F42, located in the junction unit under the dashboard B002, is interrupted (see See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT ).

The body computer node M001 receives the vehicle speed signal, at pin 18 of connector C, supplied by the ABS control unit which processes the data taken from the ABS wheel sensors.

The ABS control unit M050:

• from pins 16, 9 supplies the left K070 and right K071 front wheel sensors;
• from pins 6, 19 supplies the left K075 and right K076 rear wheel sensors;
• from pins 5, 10 receives the signals supplied by the left K070 and right K071 front wheel sensors;
• from pins 17, 8 receives the signals supplied by the left K075 and right K076 rear wheel sensors.

The ABS control unit M050 is connected to earth C012 at pins 1 and 4, while pin 11 is dedicated to the K line set aside for diagnosis SeeE8010 DIAGNOSTIC MULTIPLE CONNECTOR . The body computer node, in the case of a fault signal received from the ABS control unit, via the B-CAN switches on the relevant warning light present on the instrument panel (for further details  See E4010  INSTRUMENT PANEL ).

The D001 junction is housed, in the interior compartment, at the bottom of the front right pillar, near the door cable pass, passenger side.