Electronic Control Unit; Schematic Diagram Of The Mk 25 Abs Control Unit - Ford Transit 2002 Owner's Manual

This modulation is carried out by each of two solenoid valves, the inlet valve (open when no
current is applied), and the outlet valve (closed when no current is applied).
All controlled brake circuits are equipped with two such valves.

Electronic control unit

The coils integrated in the control unit housing are connected directly to the solenoid valves
during assembly.
The connector plug for the pump motor is not visible from the outside, instead it is passed
through the aluminium block and joined directly to the motor.
On the printed circuit board of the electronic control unit there is a 32 bit microcontroller,
an input/output driver with fixed voltage regulator and two semiconductor relays as drivers
for the valves and the pump motor.
The reliability is increased by the extreme integration and the very small number of chips.
The microcontroller prepares the signals of the wheel sensors and of the brake light switch
and then processes the wheel speed information and control algorithms.
The connection to the vehicle electronics is made through just one wiring harness
connector.
The MK 25- ABS control unit can be diagnosed using WDS.

Schematic diagram of the MK 25 ABS control unit

Item Part Number
1 -
2 -
3 -
4 -
5 -
6 -
7 -
-
Description
Pump motor
Valve block
Separation valves, changeover valves, outlet valves and inlet valves
Warning lamp ABS
Warning lamp TCS
Braking system warning lamp (warning lamp for electronic brake
distribution)
Input/output driver
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