ABS - FUNCTIONAL DESCRIPTION

1.8 T.SPARK, 2.0 JTS, 1.9 JTD 16V

Operational description

The ABS electronic control unit M50

receives a power supply (at pins 2 and 6) directly from the battery through the line protected by maxifuse F4 of the engine compartment junction unit B1

The ignition-controlled power supply (INT) arrives at pin 23 from the line protected by fuse F42 of the junction unit under the dashboard B2

The control unit is earthed at pins 1 and 5.

The four sensors K70

send wheel speed signals to pins 28-12, 15-16, 13-14 and 30-31 of

M50

, K75

, K76

send speed signals for the wheels to pins 28-12, 15-16, 13-14, 30-31 of M50

respectively.

The brake pedal switch I30

sends an enablement signal to pin 32 of junction unit M50

: any intervention of the ABS is excluded unless the brake pedal is pressed; switch I30

receives an ignition-operated supply (INT) from fuse F37 of junction unit B2

From pin 37 of M50

a discrete speedometer signal sent to the Body Computer M1

leaves; the same signal is replicated via the CAN.

Via the CAN, the ABS control unit M50

is connected - from pins 24 and 40 - to the Body Computer M1

and to the instrument panel E50

, to manage the "ABS failure" warning light and, if the problems involve the EBD function, the "low brake fluid level" and "handbrake" warning light

The autodiagnostic data can be read by connecting to connector G of the Body Computer M1

- pin 1: it receives the signals from pin 11 of control unit M50

via the special diagnostic line.