JAC HFC4DA1-2C, Руководство по обслуживанию

Страница: 558 / 801

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