Anti-lock brake system (ABS control unit)
P-21
Anti-lock brake system (ABS control unit)
Check of ABS control unit and control unit
Check of the system
Precautions to the maintenance diagnostics of ABS control unit
The ABS control unit concerns the safety parts; therefore, the following diagnostic precautions have to be
taken when other than in compliance with the general safe and preventive measures while other maintenance
diagnostics are carried out.
(a) The ABS control unit system has to be maintained by the technicians having received the professional
training and mastered the maintenance skills, and only original parts are allowed to use for replacement.
(b) Prior to the diagnostics of ABS control unit system, the conventional brake system shall run in normal
operation.
(c) Before and during the drive, the ECU of ABS control unit continuously monitors whether all electric
elements relevant to the ABS control unit are in sound operation.
(d) When the ignition switch turned on, the ABS control unit and EBD LIGHT have to be lit up, and in few
seconds, the ABS control unit and EBD alarm light shall go off in case of no faults in the system.
Note: The EBD alarm light and parking light are for public use. When the parking handle is pulled
up and the brake fluid too little, the alarm light will lighten up.
(e) The following two cases indicate that there are faults detested in the system:
① After the ignition switch turned on, the warning light will be held lit up for longtime;
② Do not go off once lit up in the driving process.
At this time, the driver may also perform the brake and minimize as much as possible the application of
braking force to prevent the blockage of wheel. Hence, cares must be taken to drive after the warning
light lit and have the ABS system checked and repaired at a special service station to prevent occurrence
of more faults, resulting in traffic accident.
(f) The hydraulic pressure regulator of ABS control unit with ECU comprises the following parts:
① ECU of ABS control unit: motor relay with reflux pump and solenoid relay;
② Solenoid (8pcs): including 4 inlet valves and 4 outlet valves;
③ Reflux pump and accumulator;
④ Others: motor and bolts etc.
They can be replaced by complete unit instead of being knocked down or partially replaced/exchanged.
No individual spare-part will be supplied. And no warranty will be undertaken for the ABS control unit
knocked down and equipped with the hydraulic pressure controller. No responsibility will be taken for
adverse outcomes resulted after the hydraulic pressure regulator of ABS control unit disassembled for
check or partially replaced /exchanged
(g) Connection of ECU of ABS control unit.
① The ignition switch has to be disconnected when the ECU connector of ABS control unit is unplugged;
② Assure that the ECU connector of ABS control unit is kept dried and clean and no existence of any
foreign matters exists;
③ ECU connector of ABS control unit has to be installed in place: the lower part levels with the pedestal;
④ ECU connector of ABS control unit has to be installed in place: the lateral part is perpendicular to the
pedestal.
(h) The hydraulic pressure regulator of ABS control unit with ECU must be well grounded.
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