Chery B11. Manual — part 99

Seven. C0024 Rear right wheel speed
sensor input signal = 0





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 C0024:
(1) C0032, C0033, C0034 or C0035 is
not current.
(2) ABS does not work.
(3) Braking switch is on.
(4) Rear right 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
(1) The electromagnetic relay is turned
off and pump motor and solenoid are
disconnected with the power source.
(2) Save DTC C0024.
(3) ABS is disabled and ABS alarm
lamp is on.

4. Conditions for clearing
troubleshooting codes
(1) If the conditions for setting up
troubleshooting code C0024 are gone,
corresponding scanning tools can be

used to clear the troubleshooting code.

Wheel speed sensor

Straddling
wire

Car body wire harness

Gear
ring

(2) 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 to carefully and thoroughly
follow the above steps will possibly
result in wrong diagnosis, unnecessary
component replacement and
reoccurrence of DTC C0024.

6. Diagnostic steps

Step Diagnostic

action

Expecte
d value

Yes No

1

If the checking of diagnostic circuit has been finished

To
Step 2

To Step
12

2

1. Shut off engine
2. Check if the rear right wheel speed sensor, straddling
wire harness and gear ring suffers any physical damage.
Is there any physical damage?

To
Step
13

To Step
3

3

Is DTC C0035 to be set as a current or historic code?

To
Step
14

To Step
4

4

1. Connect the scanning device and select the data list
2. Monitor wheel speed sensor
3. Trial run the car at a speed of 24km/h (15mile/h) and
then gradually lower the car speed to zero. Repeat it for
a couple of times.
Is C0024 reset or if the rear right wheel speed suddenly
lowers to zero before the car fully stops?

To
Step 5

To Step
15

5

1. Shut off engine
2. Lift and properly support the car.
3. Detach the EBCM wire harness from the EBCM
4. Connect a voltmeter to the EBCM wire harness
terminals A05 and A06.
5. Select AC mV scale
6. Rotate the rear right wheel while observing the
voltmeter (the voltage shall increase with the speed
increase)
Is the AC voltage within the range required?

At least
100mV

To
Step
16

To Step
6

6

1. Detach the rear right straddling wire harness from the
rear right wheel speed sensor.
2. Connect the ohmmeter to the rear right wheel speed
sensor terminals A and B.
Is the resistance within the range required?

800-
1,600oh
m
(resistan
ce will
increase
with
temperat
ure rise

To
Step 7

To Step
17

7

1. Rear right straddling wire harness still remains
detached from the rear right wheel speed sensor.
2. Connect the voltmeter to the rear right wheel speed
sensor terminals A and B.
3. Select AC mV scale.
4. Rotate the rear right wheel while observing the
voltmeter (the voltage shall increase with the speed
increase)
Is the AC voltage within the range required?

At least
100mV

To
Step 8

To Step
17

8

1. Detach the rear right straddling wire harness from the
ABS car body wire harness.
2. EBCM wire harness remains detached from the
EBCM.
3. Connect an ohmmeter to the EBCM terminals A05
and A06.
Is the resistance within the range required?

OL
open
circuit

To
Step 9

To Step
18

9

1. EBCM wire harness remains detached from the
EBCM.
2. Rear right straddling wire harness remains detached
from the ABS car body wire harness.
3. Connect an ohmmeter to the EBCM terminal A05 and
then to the ABS car body wire harness terminal A.
Is the resistance within the range required?

Less
than
2ohm

To
Step
10

To Step
19

10

1. EBCM wire harness remains detached from the
EBCM.
2. Detach the rear right straddling wire harness from the
ABS car body wire harness.
3. Connect an ohmmeter to the EBCM terminal A06 and
then to the ABS car body wire harness terminal B.
Is the resistance within the range required?

Less
than
2ohm

To
Step
11

To Step
20

11

1. Replace rear right wheel speed sensor straddling wire
harness.
2. Trial run the car at various speeds on various road
surfaces.
Is C0035 reset?

To
Step
16

Car
mainten
ance

12

Check the diagnostic circuit before the test is carried
out.

13

Repair the rear right wheel speed sensor, straddling wire
harness and/or damaged ring with gear rings.

14

Diagnose DTC C0035 before carrying out the steps in
the table

15

DTC C0024 is intermittent. Refer to “Assistance to
troubleshooting”.

16

Replace the EBCM.

17

Replace the rear right wheel speed sensor

18

Identify and repair the short circuit between two
circuits.

19

Repair the open circuit or high resistance between
terminals A05 and A.

20

Repair the open circuit or high resistance between
terminals A06 and B.