Chery B11. Manual - part 96

2. In the case of overflowing brake fluid, 
replace the EBCM and BPMV. 

6 

Replace the EBCM 

 

 

 

7 

Replace the BPMV 

 

 

 

 
 
 
 
 
 
 
Three C0018 Short circuit of pump motor and storage battery or open/high ground 
circuit of motor 
 
 

Ignition switch 

 

Power supply

 
 
 

Solenoid valve relay

 
 
 
 
 
 

Oil pump motor 

 
 

Electronic brake control module

Brake pressure modulator valve

 
 
 
1. Description of circuit 
The pump motor is incorporated in the 
BPMV and grounded through Terminal 
D of EBCM.  
 
2. Conditions for setting up 
troubleshooting codes 
C0018 can only be set up with the 
ignition switch turned on. Pump motor is 
instructed to be turned on and EBCM 
detects the power source short circuit or 
relatively high resistance on the pump 
ground circuit.  
3. Actions to be taken during setup of 
troubleshooting codes 

Switch off the solenoid valve relay and 
cut off the power supply to pump motor 
and solenoid valve.  
Save troubleshooting code C0018.  
Cut off ABS and turn on ABS alarm 
lamp.  
 
4. Conditions for clearing 
troubleshooting codes 
If the conditions for setting up 
troubleshooting code C0018 are gone, 
corresponding scanning tools can be 
used to clear the troubleshooting code.  
If the troubleshooting code does not 
appear for 100 ignition cycles running, it 
can be eliminated from the database.  

 
5. Assistance to troubleshooting 
Typical causes of troubleshooting code 
C0018 include: 
(1) Ground fault of Terminal D 
(2) Ground fault and no voltage of 
Terminal D 
(3) Open ground circuit of Terminal D 
(4) Overresistance of ground circuit of 
Terminal D 

(5) EBCM trouble 
 
 
 
 
 
 
 
 

 
6. Diagnostic steps 

Step Diagnostic 

action 

Expected 
value 

Yes No 

1 

If the checking of diagnostic circuit has been finished 

…… 

To 
Step 2

To 
Step 8

2 

1. Shut off engine 
2. Detach the EBCM wire harness from the EBCM 
3. Connect one voltmeter between EBCM Terminal D and 
car body ground circuit 
4. Is the voltage within the range required?  

Less 
than 1V 

To 
Step 3

To 
Step 9

3 

1. Shut off engine 
2. Detach the battery cable cathode 
3. EBCM wire harness remains detached from the EBCM 
4. Connect one ohmmeter between the battery cable cathode 
and EBCM wire harness terminals 
Is the measured resistance within the range required?  

Less 
than 
2ohm 

To 
Step 4

To 
Step 
10 

4 

1. Check if the connection between battery cable cathode 
and engine block and/or chasis is clean and fast. 
2. Start from the EBCM wire harness Terminal D and go 
along the wiring to find the grounding point on the chasis 
and check if the connection is clean and fast.  
Are the two connections clean and fast? 

 

To 
Step 5

To 
Step 
11 

5 

1. EBCM wire harness still remains detached from the 
EBCM. 
2. Unfix the EBCM from the BPMV.  
3. Check if the connector between EBCM and BPMV 
suffers any damage, rust, bad contact or overflowing brake 
fluid. 
Are the connectors and terminals all right? Is there any 
brake fluid in the engine room? Is there any damage or rust. 

 

To 
Step 6

To 
Step 
12 

6 

Connect one ohmmeter between the BPMV Terminals 1 and 
2.  
Is the pump motor resistance within the range required?  

Less 
than 
2ohm 

To 
Step 7

To 
Step 
13 

7 

Replace the EBCM 

 

 

 

8 

Check the diagnostic circuit. 

 

 

 

9 

Identify and repair the cause of ground fault of Terminal D  

 

 

 

10 

Identify and repair the cause of overresistance between 
EBCM Terminal D ground circuit and car body ground 
circuit.  

 

 

 

11 

Repair ground fault if necessary. 

 

 

 

12 

1. In the case of damage and/or rust, replace EBCM/BPMV 
if necessary.  
2. In the case of overflowing brake fluid, replace EBCM and 
BPMV.  

 

 

 

13 

Replace the BPMV.  

 

 

 

 
Four. C0021 Front left wheel speed sensor input signal = 0 
 

 

Wheel speed sensor

Strad
dling 

Car body wire harness

 
 
 
 

Gear 
ring 

 
 
 
 
 

 
1. Description of circuit 
The wheel speed sensor will create an 
AC voltage that increases with the 
increase of wheel speed. EBCM then 
calculates the wheel speed on the basis 
of the AC signal frequency. The speed 
sensor is connected to the EBCM by a 
twisted pair which can reduce the noise 
vulnerability of troubleshooting codes.  
 
2. Conditions for setup of 
troubleshooting codes 
The following conditions will have to be 
met for the setup of C0021:  
C0032, C0033, C0034 or C0035 is not 
current.  
ABS does not work.  
Braking switch is on.  
Front left wheel speed is 0, and the 
speeds of other wheels are bigger than 
8km/h (5mile/h) for at least 2.5 seconds.  
 

3. Actions to be taken for setup of 
troubleshooting codes 
The electromagnetic relay is turned off 
and pump motor and solenoid are 
disconnected with the power source.  
Save DTC C0021.  
ABS is disabled and ABS alarm lamp is 
on.  
 
4. Conditions for clearing 
troubleshooting codes 
If the conditions for setting up 
troubleshooting code C0021 are gone, 
corresponding scanning tools can be 
used to clear the troubleshooting code.  
If the troubleshooting code does not 
appear for 100 driving cycles running, it 
can be eliminated from the database.  
 
5. Assistance to troubleshooting 
In the case of any interrupted 
troubleshooting code, please thoroughly 

check the wiring and connectors, which 
shall include:  
(1) Unfix guard pipes and check if the 
wiring is damaged, short circuited and 
polluted.  
(2) Check if the terminals are deformed 
and/or damaged.  
(3) Check the contact (fastness) of 
terminals by the spare male/female 
terminals.  
(4) Check if the wire terminals are 
correct by unfixing terminals from the 
connector.  
If the driver complains that the ABS 
alarm lamp only illuminates when there 
is a change in environment moisture 
(rain, snow and car washing), please 
thoroughly check if any wheel speed 
sensor is soaked. If the troubleshooting 
code is not current, then simulate the 
impact of water soaking. Follow the 
following steps: spray 5% brine on 
suspected area. Then trial run the car at a 
speed of over 24km/h (15m/h) on 
various road surfaces (e.g. bumpy or 
curved road, etc). If any troubleshooting 
code appears, then replace the suspected 
wire harness and/or sensor.  
Make sure that the car is under room 
temperature when measuring wheel 
speed sensor resistance as the resistance 
will increase with temperature rise.  
Any failure in carefully and thoroughly 
following the above steps will possibly 
result in wrong diagnosis, unnecessary 
component replacement and 
reoccurrence of DTC0021.  
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

6. Diagnostic steps