Verona L6-2.5L (2005)
Electronic Brake Control Module: Description and Operation
General System Description
The purpose of the MGH-25 Antilock Brake System (ABS) is to minimize wheel slip during heavy braking. MGH-25 performs this function by
monitoring the speed of each wheel and controlling the brake fluid pressure to each wheel independently during a braking event. This allows the driver
to retain directional stability and better steering capability.
Basic Knowledge Required Description
Before using this section, it is important that you have a basic knowledge of the following items. Without this basic knowledge, it will be difficult to
use the diagnostic procedures contained.
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Basic Electrical Circuits: You should understand the basic theory of electricity and know the meaning of potential (voltage), current (amperes) and
resistance (ohms). You should understand what happens in a circuit with open or shorted wire. You should be able to read and understand a wiring
diagram.
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Use of Circuit Test Tools: You should be familiar with a Digital Multimeter (DMM), and be familiar with the meter controls and how to use them
correctly. You should be able to measure voltage, resistance and current. You should know how to use jumper wire to bypass components for
testing circuits.
ABS System Components Description
The MGH-25 Antilock Brake System (ABS) consists of a conventional hydraulic brake system plus antilock components. The conventional brake
system includes a vacuum booster, master cylinder, front disc brakes, rear drum brakes, interconnecting hydraulic brake pipes and hoses, brake fluid
level sensor and the brake warning lamp indicator.
The ABS components include a hydraulic unit, an EBCM (Electronic Brake Control Module), system fuse, four wheel speed sensor (one at each
wheel), interconnecting wiring, ABS indicator, the DDRP (De-coupled Dynamic Rear Proportioning) indicator (which is connected to the parking
lamp) and the rear drum brakes. See ABS Component Location for the general layout of this system.
The hydraulic unit with the attached EBCM is located between the surge tank and the fire wall on the left side of the vehicle.
The basic hydraulic unit configuration consists of hydraulic check valves, two solenoid valves for each wheel, a hydraulic pump, two accumulators,
and two dampers. The hydraulic unit controls hydraulic pressure to the front calipers and the rear wheel cylinders by modulating hydraulic pressure to
prevent wheel lockup.
Base Braking Mode Description
