Engine JAC HFC4DA1-2C. 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.