Chery A21 2005, Service Manual, Page: 270 / 475

ABS System
for the cars with no ABS, when forcibly steps down the brake pedal
during driving, the wheel speed will decrease suddenly. Once the brake force is more than the
friction between wheels and floor, wheels will be braked. The wholly braked wheels will decrease
the friction between tire and floor, if the front wheels have braked, driver can hardly control the
running direction of the car; and if the rear wheels have braked, the car will swing. The ABS is
used to restrain the skidding phenomenon of wheel specially. It will supervise the speed of each
wheel and control the hydraulic pressure when braking. This can enable the driver to keep the
stability of direction and help the car possess better steering capability. The circuit diagram is
shown as figure 10-1.
The voltage of the 30th wire supply to the 31st pin of ABS control unit via the 40A fuse Sb4;
The voltage of the 30th wire supply to the 2nd pin of ABS control unit via the 40A fuse SB5; The
voltage of the 15th wire supply to the 32nd pin of ABS control unit via the 5A fuse Fb1.
Th e 12 13 26 27 41 42 43 44 of ABS control unit connec t to the F/L
F/R R/L R/R wheel speed sensor respectively; when the wheel runnin g, the sensor
produces voltage signal which changes with the increase of speed.
Th e 6th pin of ABS contro l unit connect to the brake switch signal; the 16th 、 45th pin
of ABS control unit connects to g round.
Th e 3rd pin of ABS control unit connect to CAN-H wire, an d connects to the 30th pin
of combi nation instrument 、 62nd pin of engine ECU respectively. The18th pin of A BS
control unit connec ts to CAN -L wire, and connects to the 29th pin of combination
instrume nt 、 81st pin of engine ECU respectively.
、 、 、 、 、 、 、 、
、 、
Circuit analysis:
32
30
15
A CC1
ACC2
31
ILLUM
FB1
5A
SB4
40A SB5
40A
ABS Control module
41 42 43 44 12 13 26 27 3 18 16 45
31
CAN_ H
CAN_L
31 2
L/W R R
B Y V V /W G Y/B R Br W W/B B B
6
Lg
To The
Brake Switch,
ECU21#,
Front ISU PE2 22#
K7 A2 A1
ECU/Front
Ground/4
Front/Rear
1/14
ECU/Front
Ground/3
Front/
Rear 6
ECU/Front
Ground/12
Front/Rear
1/15
ECU/Front
Ground/ 11
Front/
Rear 17
ECU/Front
Ground/15
ECU/ Front
Ground/7
ECU/Front
Ground/8
ECU/Front
Ground/16
Left
Wheel
S peed Sensor
Front
W heel
Speed Sensor
Front R ight
④ ④
Rear Right Wheel Sens or Speed
Rear Left
Wheel Sensor Speed
Rear Right
Wheel Sensor Speed
R ear L eft Wheel Sensor Speed
Figure10
ABS System -1 Circuit
Installation position ofABS control assembly
Position of ABS control m odule
ABS brake down parts
Brake lamp switch Brake pedal
ABS control unit Hydraulicpressure
pump electromotor
Sensor
Control unit
Execute parts
ABS warning indicator lamp
Self-diagnosis connector Front wheel speed sensor
Rear wheel speedsensor
ABS hydraulic pressure unit with
low pressure reservior
22
El ectroma gnetic valve