Chery B11. Manual — part 91

5. Reinstalling the ABS assembly
Note: dismantle the hydraulic outlet
plugs on ABS assembly only when the
brake pipeline is to be fixed to avoid
foreign matters entering into the braking
system.
Clean the electronic control module
seals and BPMV sealing washer with
alcohol.
(1) Install the ABS assembly onto the
bracket and screw it fast with a torque of
18-30Nm.
(2) Unfix the plugs on hydraulic outlets,
fix brake pipes and make sure that they
are correctly connected.
(3) Fill new brake fluid into the liquid
storage tank until the liquid reaches the
MAX level and bleed as required.
(4) Turn on the ignition switch and ABS
alarm lamp must be on for 1.7 seconds
before going off.
(6) Clear the memory and check if there
is any fault code.
(7) Carry out final trial running to ensure
that ABS is functioning well.

Two. Description of ABS component
functions
1. Brake pressure modulator valve
(BPMV)
(1) Function: BPMV is installed in the
engine room and will regulate the brake
fluid applied onto each wheel during
anti-lock braking. During normal
braking, the BPMV maintains or reduces
the pressure of brake fluid of each wheel
regardless of the pressure of the brake
cylinder.
(2) Maintenance: BPMV is not a
maintainable component and therefore
not to be disassembled but replaced in
the case of troubles. BPMV features four
circuits which work on the front left,
front right, rear left and rear right wheels
respectively.
(3) Composition of BPMV:

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①Pump motor
BPMV includes one motor-driven
recycling pump which reduces the
pressure and redirects the brake fluid
from the brake caliper into the cylinder
during anti-lock braking.
②ABS valve
The ABS valves reduce or maintain the
brake fluid pressure of wheel circuits.
They consist of four boost valves and
four relief valves. During anti-lock
braking, the electronic brake control
module indicator valve reaches the
correct position. With the anti-lock brake
module, each hydraulic circuit pressure
may be adjusted by the corresponding
valves. Under normal circumstances, the
boost valve is open and the relief valve
is off so that the cylinder pressure may
directly work on the brake during normal

braking. Anti-lock brake valve is an
inalienable part of the BPMV and can’t
be repaired independently.
2. Electronic brake control module
(EBCM)
(1) The major functions of EBCM are as
follows:
1) Monitor the input of wheel speed
sensor
2) Detect the skidding of wheels
3) Control the braking system under the
anti-lock or tractor control module.
4) Supervising the system to ensure the
normal electrical operation.
The EBCM continuously checks the
speed of each wheel to determine if the
wheel has started to skid. If it is detected
that the wheel has started to skid, the
EBCM controls the valve status to
regulate the brake fluid pressure of some
or all circuits so that the car skidding
may be prevented or the optimal braking
or traction may be provided. The EBCM
keeps on regulating the pressure of all
hydraulic circuits until the car skidding
is eliminated.
The EBCM can also continuously
monitor the status of ABS operation. In
the case of any detected trouble, the
EBCM can stop the ABS and turn on the
ABS alarm lamp. The EBCM controls
the display of ABS troubleshooting
codes in the mode of troubleshooting.
(2) Composition of EBCM
1) Solenoid valve relay
The solenoid valve relay provides power
to the pump motor and the solenoid
valve. The relay is normally on but
turned off during startup. In other
driving cycles, the relay will remain off
so long as the troubleshooting code does
not require that it be turned on. If the
troubleshooting code is set to require
that the relay be off, there will be no
remaining battery voltage in the pump
motor and the solenoid valve during the

current driving cycle and subsequently
the ABS will not work. The relay is an
inalienable part of the EBCM and can
not be independently repaired.
2) Wheel speed sensor and gear ring
Each wheel is equipped with one speed
sensor which sends the wheel speed
status signals to the EBCM with
relatively small AC voltage. This voltage
is created by the gear ring through the
induction caused by the static sensor.
The scale and frequency of the AC
voltage are in direct proportion to the
wheel speed. This signal is transmitted
to the EBCM through the interfaces
which may cause wrong codes or noise
WSS. Two types of speed sensors are
used in DBC7 system.
3) Split-type wheel speed sensor and
gear ring type
The four wheel speed sensors are all
installed in proximity to the gear rings.
The sensors and the gear rings are
independent devices and therefore can
be independently repaired.
(3) ABS alarm lamp (amber color)
The ABS alarm lamp is located inside an
instrument. In the case of ABS trouble
detected by the EBCM, the alarm lamp
will light up. The alarm lamp informs
the driver of possible ABS troubles that
cause the ABS to be disabled. If only the
ABS alarm lamp is on, normal braking is
still enabled. The ABS alarm lamp will
be on in the following cases:
1) ABS trouble: as said above, the ABS
alarm lamp will light up if there is any
ABS trouble detected.
2) Checking of instrument bulb: during
ignition, the ABS alarm lamp will also
flash for about three seconds. The
EBCM will instruct the ABS alarm lamp
to flash for three seconds after it receives
the ignition signal.

(4) Braking alarm lamp (red)
The braking alarm lamp in the
instrument will turn on to warn the
driver of any trouble in the braking
system which may reduce the braking
performance. This lamp will light up
when the parking brake pedal is stepped
down and not fully released. Or it will
remain on if the brake fluid level switch
is off (relatively low level in the brake
fluid tank) until things have been
corrected and improved. Some failure
modes in the DBC7 system will also turn
on this lamp to inform the driver that
DDRP can’t be used any longer.
Vent pipe
EBCM’s C11 needle is a plastic vent
pipe that directs the wind between
EBCM and BPMV into the engine room.
(5) Brake switch
The brake switch inputs signals to the
EBCM which informs whether the brake
pedal has been stepped down with the
input signals.
3. Distribution of electronic braking
power
DDRP is a ratio system which maintains
the car stability during braking. In the
case of normal braking, it effectively
balances the braking power to realize the
same wheel speed. In the case of
difficult braking, the car weight is
mostly borne by the front wheels while
the rear wheels will need relatively
smaller braking power. DDRP utilizes
the ABS rear boost valves and relief
valves to maintain the braking pressure
on the rear wheels to provide effective
braking and car stability. In DDRP
system, the rear pressure-keeping valve
solenoid valve is powered by the ignition.
In the case of the following troubles, the
red braking alarm lamp will be turned on.
(1) The two wheel speed sensors do not
work on the same axle.

(2) Rear boost solenoid valve does not
work.
(3) There is short circuit in the
grounding circuit of battery 2 (motor
input).
(4) There is short circuit in the
grounding circuit of battery 1 or open
circuit (ECU input).
(5) There is open circuit of motor
grounding circuit and battery short
circuit.
(6) There is open circuit of ECU
grounding circuit or battery short circuit.
(7) There is open circuit of ignition
circuit or short circuit in the grounding
circuit.

Section Three. Description of EBCM Wiring

One. DBC7 (ABS/DDRP) ABS Wiring Diagram

Wheel speed
sensor

Oil pump motor

Parking brake

Brake fluid liquid
level switch

Braking alarm
lamp

ABS alarm lamp

Ignite

Ig

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iti

o

n

s

w

itc

h

To brake switch

B

ra

k

e

sw

itc

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Power supply

40099