Chery S11 / Chery QQ. Manual — part 192
Chery QQ Maintenance Manual Chassis System
6、No DTC put out( cannot communicate with tester)
Possible cause
Open in ABS ECU source circuit or diagnosis
circuit
·Fuse burn out
·Diagnosis wire
loose or damage
·ABS ECU damage
·Tester problem
No
Yes
Fix tester and try
again
Can tester communicate with
other MK20 ABS ECU
Abnorma
Replace
Check ABS fuse
Norma
No
Abnorma
Yes
On
No
Fix diagnosis plug or harness
Any display on tester
Check source wire,
ground wire, and
connector
Check terminal is conducted
with diagnosis terminal
(MK20I/E : terminal 7)
Fix or
replace
Replace ABS ECU
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Chery QQ Maintenance Manual Chassis System
8、ABS inspection
Terminal
Item
Key
position MK20I/E
Specifications Unit
Battery and motor
voltage
OFF
25-8
10.1-14.5
V
Battery and solenoid
voltage
↑
9-24
↑
V
Source isolation
↑
8-4
0.00-0.5
V
Ground isolation
↑
8-24
↑
V
Source
ON
8-4
10.0-14.5
V
OFF
Light off
ON
ECU not
connected
Light on
OFF
Light off
ABS light
ON
Connect ECU
Light on for 1.7
sec and off
Brake light pedal not
push down
ON
8-18
0.0-0.5
V
Brake light pedal
push down
ON
8-18
10.0-14.5
V
Front left sensor
resistance
OFF
1-2
1.0-1.3
KΩ
Front right sensor
resistance
OFF
19-20
1.0-1.3
KΩ
Rear left sensor
resistance
OFF
5-6
1.0-1.3
KΩ
Rear right sensor
resistance
OFF
22-23
1.0-1.3
KΩ
Front left sensor out
put voltage
OFF
1-2
3.4-14.8
mV/HZ
Front right sensor
resistance out put
voltage
OFF
19-20
3.4-14.8
mV/HZ
Front left sensor out
put voltage
OFF
5-6
>12.2
mV/HZ
Rear left sensor out
put voltage
OFF
22-23
>12.2
mV/HZ
Sensor out put
voltage ratio
Max peak voltage
≦ 2
Min peak voltage
51
Chery QQ Maintenance Manual Chassis System
9、Check ABS
(1) Check the out put voltage of speed sensor
1. Check if the clearance between speed sensor and teeth ring is satisfied with
specification.
2. Lift the wheel and release manual brake.
3. Remove ABS harness and measure the points of connector.
4. Run the wheel at speed of 1/2 RPM and measure the out put voltage.
MK20 I MK20 I/E
Front left wheel terminal 4 – 11 terminal 1 - 2
Front right wheel terminal 3 – 18 terminal 19 – 20
Rear left wheel terminal 2 – 10 terminal 5 - 6
Rear right wheel terminal 1 – 17 terminal 22 – 23
5. If the voltage is not with specification, the causes may be:
The clearance between sensor and teeth ring is too big.
Sensor malfunction.
The resistance of sensor is 1.0—1.3 k.
Distortion of teeth ring.
10、Removal and installation
(1)、 Spare parts offering
* HECU assembly dry type;
* HCU and ECU separate HCU wet type
(2)、Precaution on removing
Repair the faults after find the
cause for malfunction with test
instrument
Only open the package before
installation.
Only use original parts.
Only clean with soft cloth.
Don’t use compressed air or move the
vehicle when ABS is working.
Block the outlet for each pipe after
removing the parts.
Please use DOT 4 brake fluid.
Dip the seal and o-ring with brake liquid.
Check the function of ABS and conventional brake system is normal after
repairing.
Check if any leakage on each connector.
(3)、MK20-I HECU assembly Removal
Turn off ignition switch and disconnect (-) wire on battery.
Remove the harness from ABS assembly.
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Chery QQ Maintenance Manual Chassis System
Put down pedal >60mm and fix with bracket to prevent liquid flow out.
Remove the brake pipe AB on master cylinder and marked with dot. Block the
outlet with rubber cover.
Remove brake liquid pipe 1—4 and marked with dot. Block the outlet with rubber
cover.
Loosen the bolts fixing HECU to support.
Remove HECU from support.
(4)、Replace HECU
Remove the harness of pump motor.
Remove 4 bolts and don’t reuse.
Separate HCU and ECU.
Install new HCU on ECU.
Screw the bolts fixed HCU on ECU with torque 3+1 Nm.
Insert the harness of motor.
4
2
3
1
B
A
(5)、Replace ECU
Remove the harness.
Remove 4 bolts and don’t reuse.
Remove HCU from ECU.
Install new HCU on ECU.
Screw the bolts fixed HCU on ECU with
torque 3+1 Nm.
Insert the harness of motor.
(6)、Install ABS assembly again
Attention:Only remove the cover on hydraulic
outlet while install the brake pipe to prevent
the matter dropping into system.
Install ABS assembly on support with torque 20+4Nm.
A 前活塞 B 后活塞
1 右前轮 2 左后轮
3
右后轮
4
左前轮
A.Front piston; B.Rear piston
1.Right front wheel;2.Left rear wheel
3.Right rear wheel;4.Left front wheel
Remove the cover on hydraulic outlet and install brake pipe with torque 12+4Nm
M10×1 and 15+3Nm M12×1.
Make sure the pipe is installed correctly.
Charge new brake fluid to MAX position and exhaust gas according to
specification.
Turn on ignition switch, ABS warning light will be up for 1.7 second and turn
off.
Clear DTC.
Drive the vehicle to confirm the function of ABS and feel pedal is rebound.
11、ABS ECU Socket
53
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