FUNCTIONAL DESCRIPTION OF ABS

2.0 16V JTD, 2.2 16V JTD · MY 2005

The ABS function is managed by ABS control unit M050.

Control unit M050 is supplied at connector A from engine compartment control unit B001:

- at pin 2, by a line protected by fuse MF02 from pin 2 of connector D;

- at pin 3, by a line protected by fuse MF03 from pin 3 of connector D;

- at pin 18, by a line protected by fuse F07 from pin 3 of connector F;

Control unit M050 communicates via the CAN line (pin 26 and 15, 14 and 25 connector A) with the body computer node M001) (pins 2 and 4, 25 and 27 connector E, pins 8 and 10 connector D), with engine control unit M010 (pins A3 and A4 connector A), with instrument panel E050 (pins 6 and 12), with warning light and odometer control unit M140 (pins 2 and 5) and with engine compartment control unti B001 (pins 11 and 12 connector F).

Control unit M050 (pins 16-5, 9-10, 6-17, 8-19 connector A respectively) controls the speed of each wheel via left front wheel sensor K070 (pin 1 and 2), right front wheel sensor K071 (pins 1 and 2), left rear wheel sensor K075 (pins 1 and 2) and right rear wheel sensor K076 (pins 1 and 2).

Left brake wear sensor K020 and right brake wear sensor K021 (pin 1 connector A) send an earth signal to control unit M050 (pin 22 connector A).

Brake fluid level signal sensor K02 (pin 1) is connected to M050 (pin 21 connector A), which sends signals (via the CAN line) to control units E050 and M140.

Instrument panel E050 (pin 13) and warning light and odometer control unit M140 (pin 4) are supplied by body computer node M001 (pin 6 connector D) via a line protected by fuse F14.

There is a second "redundant" switch on the brake pedal used, in particular, by the engine management control unit and the ABS control unit. The "basic" switch (I030) is the "normally open" type (when the pedal is pressed, the switch closes), whilst the "redundant" switch (I035) is the "normally closed" type (when the pedal is pressed, the switch contact opens): the system checks the consistency of the "pedal pressed" information in this way.

The brake pedal pressed signal reaches brake pedal switch I030:

- pin 1 is connected via a line protected by fuse F31 to pin G31 of connector G of supplementary fuse box B098;

- pin 2 is connected to pin 4 of connector B of body computer node M001 and with pin 20 of connector A of control unitM050.

Pin 1 of redundant switch I035 is connected to pin 20 of connector F of engine compartment junction unit B001 via a line protected by fuse F06, while pin 2 is connected to pin E4 of connector A of control unitM010.

Pin 2 of clutch pedal switch I031 is connected to pin E3 of connector A of control unit M010 and pin 1 is connected to pin 9 of connector B of M001.

Control unit M050 (pin 11 connector A) is equipped with a self-diagnostic function: The control unit autodiagnostic data can be read by connecting to connector R010 (pin 12).