Engine JAC HFC4DA1-2C. Manual — part 143
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
93
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
3.
Reflux pump motor fault: C0110
Circuit description:
ABS hydraulic unit with ECU integrates reflux pump with motor. Reflux pump relay shall stop operation and the
reflux pump shall be under stationary state if no regulation is performed by ABS. When decompression is regulated by
ABS, ABS ECU shall control the operation of reflux pump motor through controlling the grounding of reflux pump
relay.
Function:
�
ABS Pressure reducing phase: Reflux pump shall operate to pump the brake fluid in the wheel cylinder of locked
wheel back into the master cylinder line so as to reduce the pressure of wheel cylinder.
�
EBD Pressure reducing phase: Pressure accumulator shall store the brake fluid flowed back from rear wheels.
DTC
Detection Condition
Set Condition
Possible Faulty Areas
C0110
To be conducted at the
same time of ABS ECU
initialization
and
self-checking:
Vehicle
under
stationary state or speed
≥15Km/h
1. After the reflux pump motor relay
operates for 60ms, still no voltage
signal can be detected by reflux
pump monitoring.
2. Under no operation of reflux pump
motor relay, voltage detected by
reflux pump monitoring exceeds
2.5s.
3. If the reflux pump motor relay stop
operation,
no
voltage
drop
is
detected
by
reflux
pump
monitoring.
1.
“Reflux pump motor circuit”
inside ABS.
2. Open circuit of reflux pump
motor relay.
3. Fault of reflux pump motor relay.
4. Fault
of
reflux
pump
motor
wiring.
5. Imperfect ground.
6. Inadequate power supply.
7. Fault of reflux pump motor.
Occurrence of fault shall give rise to the following operation:
Braking Strategy
Failure Protection
�
Fault of reflux pump relay: Reflux pump failed to
operate
�
Wheel brake force control is disabled due to no
back-flow pressure can be generated. System shall
perform conventional braking.
�
Brake system shall enter the conventional braking
mode.
�
ABS and EBD warning lamps shall be lit.
Remarks:
If the ignition switch is turned on after fault removal, the ABS and EBD warning lamps shall go out automatically
when the vehicle speed exceeds 12Km/h.
Troubleshooting procedures
S/N
Operating Step
Operation
Detection
Result
Next Step
1
Parking the vehicle to
check ABS hydraulic
governor with ECU
(a) Turn off the ignition switch;
(b) Is any noise heard from ABS hydraulic governor?
Normal state: ABS reflux pump shall stop operation.
Normal
Go to the next step.
Abnormal
Go to Step 4
2
Inspection
of
self-checking
initializer
of
ABS
hydraulic
governor
with ECU
(a) Start the engine;
(b) Run at speed of 10~15Km/h without brake pedal
depressed;
(c) Check if ABS warning lamp is lit and when necessary
use diagnostic instrument to read DTC.
Normal state: ABS warning lamp shall go out without
DTC memory in ABS ECU.
Normal
Go to the next step.
Abnormal
Repair
based
on
DTC.
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
94
S/N
Operating Step
Operation
Detection
Result
Next Step
3
Using
diagnostic
instrument to perform
component testing for
ABS
hydraulic
governor with ECU
(a) Turn off the ignition switch;
(b) Connect the diagnostic instrument to OBD port;
(c) Turn on the ignition switch with engine off;
(d) Apply the “Component Test” function of diagnostic
instrument to activate the reflux pump.
Normal state: Operation sound of reflux pump can be
heard.
Normal
Go to the next step.
Abnormal
Replace ABS control
unit assembly.
4
Checking pin voltage
of
ABS
hydraulic
governor with ECU
When using multimeter:
(a) Turn off the ignition switch;
(b) Remove connectors from ABS hydraulic governor with
ECU;
(c) Use multimeter to measure the voltage at the power
terminal and grounding terminal of reflux pump.
Remarks:
If no jumper box is applied, the normal detection cannot be
ensured.
Normal value: U=9.3~16.9V
Normal
Replace ABS control
unit assembly.
Abnormal
Go to the next step.
5
Checking
connecting
wires, connectors and
40A fuse
(a) Check if 40A fuse is normal;
(b) Check the charging system, such as generator/battery
and its connecting wire;
(c) Ensure the grounding terminal is well grounded.
Normal
Go to the next step.
Abnormal
Replace
or
repair
connecting
wire/connector
or
fuse.
6
Final inspection.
(a) Clear DTC;
(b) ABS and EBD warning lamps shall go out shortly after the ignition switch is turned on;
(c) C0110 DTC shall no longer appear with the ignition switch turned on;
(d) When travelling at speed of 10~15Km/h, C0110 DTC shall no longer appear without brake pedal
depressed.
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
95
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
4.
Solenoid valve relay circuit fault: C0121
Circuit description:
With the ignition switch turned on and ABS solenoid valve relay powered on, battery voltage can be provided to one
terminal of solenoid valve of hydraulic governor.
With ignition switch turned off or ABS system disabled, the solenoid valve relay should be kept power-on.
Function:
ABS ECU is applied to control the operation of solenoid valves through controlling their grounding so as to regulate
brake pressure of each brake circuit.
DTC
Detection Condition
Set Condition
Possible Faulty Areas
C0121
1. With
the
ignition
switch turned on and
in the course of fault
testing
2. In the course of ABS
operation
Short circuit of solenoid valve, or
voltage circuit short to Uz or ground, or
fuse blowout is detected.
The
time
of
voltage
supplied
for
solenoid valve detected to be <0.8*Uz
(≈8.0V) exceeds 0.8s.
1.
“Solenoid valve relay circuit”
inside ABS.
2. Inadequate power supply.
3. Short circuit.
4. Open circuit.
Occurrence of fault shall give rise to the following operation:
Braking Strategy
Failure Protection
�
Fault of solenoid valve relay: Solenoid valve failed to
operate
�
Brake system shall enter the conventional braking
mode.
�
ABS and EBD warning lamps shall be lit.
�
If the solenoid valve relay stop operation due to fault
of audion in ECU,
�
The system shall be converted to EBD emergency
control mode.
�
ABS warning lamp shall be lit.
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting procedures:
procedures:
procedures:
procedures:
S/N
Operating Step
Operation
Detection
Result
Next Step
1
Checking
ABS
hydraulic
governor
with
ECU
under
stationary
state
of
vehicle
(a) Turn off the ignition switch;
(b) Turn on the ignition switch without brake pedal
depressed;
(c) Check if ABS and EBD warning lamps are lit and when
necessary use diagnostic instrument to read DTC.
Normal state: ABS/EBD warning lamp shall go out
without current DTC.
Normal
Go to the next step.
Abnormal
Go to Step 3
ABS
ABS
ABS
ABS Anti-lock
Anti-lock
Anti-lock
Anti-lock Brake
Brake
Brake
Brake System
System
System
System
96
S/N
Operating Step
Operation
Detection
Result
Next Step
2
Using
diagnostic
instrument to perform
component testing for
solenoid valve of ABS
hydraulic
governor
with ECU
Remarks:
① Before testing solenoid valve, please test he reflux pump
to see if it operates normally.
② Two repair men are required to finish this test.
(a) Turn off the ignition switch;
(b) Connect the diagnostic instrument to DLC.
(c) One repair man should sit in the vehicle and the vehicle
should be lifted by lifter with wheels suspended.
(d) Turn on the ignition switch with engine off.
(e) Apply the “Component Test” function of diagnostic
instrument to activate the solenoid valve as per prompt of
diagnostic instrument.
(f) Firstly, test the oil inlet valve and oil outlet valve of left
front wheel, during which, the repair man in the vehicle
should depress the brake pedal with force and hold it.
① Conventional braking phase:
Normal state: The repair man outside cannot rotate the
left front wheel by hand.
② Boosting phase: Use diagnostic instrument to access the
“boosting phase”.
Normal state: The repair man outside cannot rotate the
left front wheel by hand.
③ Pressure maintenance phase: Use diagnostic instrument to
access the “pressure maintenance phase”.
Normal state: The repair man outside cannot rotate the
left front wheel by hand.
④ Pressure reducing phase: Use diagnostic instrument to
access the “pressure reducing phase”.
Normal state: The repair man outside can rotate the left
front wheel by hand.
(g) Perform testing for right front, left rear and right rear
wheels in sequence.
The test results should be the same as those of left front
wheel.
Normal
Go to the next step.
Abnormal
Replace
ABS
control
unit assembly.
3
Checking pin voltage
of
ABS
hydraulic
governor with ECU
When using multimeter:
(a) Turn off the ignition switch
(b) Remove connectors from ABS hydraulic governor with
ECU.
(c) Use multimeter to measure the voltage at the power
terminal and grounding terminal of solenoid valve.
Remarks:
If no jumper box is applied, the normal detection cannot
be ensured.
Normal value: U=9.3~16.9V
Normal
Replace ABS hydraulic
governor with ECU.
Abnormal
Go to the next step.
4
Checking
connecting
wires, connectors and
40A fuse
(a) Check if 25A fuse is normal.
(b) Check the charging system, such as generator/battery and
its connecting wire.
(c) Ensure the grounding terminal is well grounded.
Normal
Go to the next step.
Abnormal
Replace
or
repair
connecting
wire/connector or fuse.
5
Final inspection.
(a) Clear DTC.
(b) ABS and EBD warning lamps shall go out shortly after the ignition switch is turned on
(c) With the ignition switch turned on, C0121 DTC shall no longer appear after self-checking is
finished by system.
(d) Perform Step 2 in this procedure and the testing result is normal.
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