Engine JAC HFC4DA1-2C. Service manual - part 140
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
- 81 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Detection
Detection
Detection
Detection by
by
by
by diagnostic
diagnostic
diagnostic
diagnostic instrument
instrument
instrument
instrument
Remarks:
Data of switches, sensors, actuators and so on can be
read through data stream of diagnostic instrument
without removal/installation of any element.
Therefore,
the
reading
of
data
stream
before
troubleshooting is one of the methods for shortening
maintenance time.
Functions of diagnostic instrument shall be determined
based on actual development of customer’s instrument.
Please refer to corresponding instruction manual of
diagnostic instrument for certain vehicle for details.
The diagnostic contents (BOSCH diagnostic instrument)
listed below is only for reference.
(a)
Connect the diagnostic instrument to data link
connector (DLC).
(b) Turn on the ignition switch.
(c)
Read data stream based on display of diagnostic
instrument.
Remarks: Apply the diagnostic instrument to test ABS,
which should be performed in road test. DTC can be
cleared when necessary to ensure normal operation of
ABS and conventional brake system.
Please finish the following procedures before the
replacement of ABS:
1.
Dynamic self-checking: ABS lamp won’t go out
when the ignition switch is turned on again after
some faults (such as wheel speed sensor signal
reliability failure or motor failure) are eliminated
and the lamp shall go out after ABS dynamic
self-checking is qualified with the vehicle speed no
less than 15Km/h.
2.
Cross validation: Install the removed ABS onto a
normal vehicle equipped with the same ABS model,
with ABS harness connectors connected but no oil
pipe in need of connection, and ensure ABS
connectors and wheel speed sensors are firmly and
reliably connected. Start the vehicle to run for a
few circles to enable ABS dynamic self-checking.
�
If the ABS lamp goes out, there is no failure in
ABS.
�
If the lamp keeps on, there is failure in ABS.
The ABS may be replaced.
Item
Display Valve/Range
Normal State
Remarks
Left front wheel speed
1.75Km/h～350Km/h
Actual wheel speed
Right front wheel speed
1.75Km/h～350Km/h
Actual wheel speed
Left rear wheel speed
1.75Km/h～350Km/h
Actual wheel speed
Right rear wheel speed
1.75Km/h～350Km/h
Actual wheel speed
Battery voltage
0～+20.40V
9.3～16.9V
Left front oil inlet valve
ON/OFF
With ignition switch turned on:
Power failure
Other conditions: Based on
control
Relevant to ABS conditions:
Pressure boosting:
Oil inlet valve - power failure
Oil outlet valve - power failure
Pressure maintenance:
Oil inlet valve - continuity
Oil outlet valve - power failure
Pressure reducing:
Oil inlet valve - continuity
Oil outlet valve - continuity
Left front oil outlet valve
ON/OFF
Right front oil inlet valve
ON/OFF
Right front oil outlet valve
ON/OFF
Left rear oil inlet valve
ON/OFF
Left rear oil outlet valve
ON/OFF
Right rear oil inlet valve
ON/OFF
Right rear oil outlet valve
ON/OFF
Brake lamp switch
ON/OFF
ON: With brake pedal
depressed
OFF: With brake pedal released
Reflux pump motor
ON/OFF
Solenoid valve relay
ON/OFF
With ignition switch turned on:
Continuity
Occupied state of hydraulic
governor
Already occupied and normal or
BOSCH supply status
Already occupied and normal