Engine JAC HFC4DA1-2C. Service manual — part 138
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
- 73 -
Anti-lock Brake System (ABS)
Applied models: SUNRAY products manufactured by JAC
Subject
Page
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
ABS system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
ABS system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Operating principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 79
Inspection and confirmation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Fault Symptom Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 85
Removal/Installation
Removal/Installation
Removal/Installation
Removal/Installation
ABS system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..101
Wheel speed sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
- 74 -
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
Anti-lock
Anti-lock
Anti-lock
Anti-lock brake
brake
brake
brake system
system
system
system (ABS)
(ABS)
(ABS)
(ABS)
BOCSH 8 ABS is adopted for JAC multifunctional commercial vehicles.
ABS Hydraulic Assembly
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
- 75 -
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
Operating
Operating
Operating
Operating principle
principle
principle
principle
Connection
Connection
Connection
Connection Diagram
Diagram
Diagram
Diagram of
of
of
of ABS
ABS
ABS
ABS Brake
Brake
Brake
Brake Line
Line
Line
Line (Diagonal Layout)
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
- 76 -
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
Precautions
Precautions
Precautions
Precautions for
for
for
for ABS
ABS
ABS
ABS system
system
system
system diagnosis
diagnosis
diagnosis
diagnosis
As ABS is a safety related component, the following
precautions should be observed in addition to general
safety and preventive measures that should be taken in
the course of maintenance and diagnosis.
1.
Maintenance for ABS system should be conducted
by specially trained technicians that mastering the
maintenance
skills
and
only
genuine
parts
manufactured by the original manufacturers should
be applied for replacement.
2.
Before conducting diagnosis over ABS system, the
conventional
brake
system
should
operate
normally.
3.
Before and during travelling, ABS ECU shall
perform continuously monitoring over ABS related
electrical components to see if they can operate
normally.
4.
ABS and EBD lamps shall be lit when the ignition
switch is turned on and go out in several seconds
based on no fault existed in system.
5.
The following two conditions indicate that there is
fault detected in the system:
① The warning lamp keeps on after the ignition
switch is turned on;
② The warning lamp doesn’t go out after it is
turned on during travelling.
Under those conditions, the driver can still
apply conventional brake but should minimize
the applied braking force to avoid wheel
locking. Therefore, please be attentive to drive
carefully after the warning lamp is lit. Please go
to the service shop for maintenance of ABS
system as soon as possible in order to avoid
occurrence of more faults and traffic accidents.
6.
ABS hydraulic governor with ECU consists of the
following parts:
① ABS ECU: Including reflux pump motor relay
and solenoid valve relay;
② Solenoid valves (8): Including 4 oil inlet valves
and 4 oil outlet valves;
③ Reflux pump and pressure accumulator;
④ Others: Motor, bolts and so on. They can only
be replaced as a whole instead of being
removed
for
overhaul
or
partly/separately
replaced. BOSCH Company won’t provide
separate spare parts, won’t provide maintenance
warranty for the disassembled ABS with
hydraulic controller, as well as won’t bear any
responsibility for consequences
caused by
removal overhaul or part/separate replacement.
7.
Connectors for ABS ECU:
① The ignition switch must be turned off before
the removal of connectors for ABS ECU;
② Keep the connectors for ABS ECU dry and
clean without any foreign matter;
③ The connectors for ABS ECU must be
installed in position with bottom parallel to
the base;
④ The connectors for ABS ECU must be
installed in position with lateral part vertical
to the base.
8.
ABS hydraulic governor with ECU should be
grounded properly. If not, water and moisture shall
permeate into connectors of ABS ECU via pore
path of harness under the capillary (syphon) effect,
leading to failure.
9.
Please ensure ABS brake line properly connected,
because ABS ECU is unable to diagnose whether
the brake line is properly connected or not and to
realize failure protection. Wrong connection may
possibly lead to severe accidents.
�
MC1: Connected with brake line 1 of brake
master cylinder;
�
MC2: Connected with brake line 2 of brake
master cylinder
�
FL: Connected with brake line of left front
brake wheel cylinder;
�
FR: Connected with brake line of right front
brake wheel cylinder;
�
RL: Connected with brake line of left rear
brake wheel cylinder;
�
RR: Connected with brake line of right rear
brake wheel cylinder.
10. Ensure each wheel speed sensor wiring properly
connected.
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