2008 GEELY CK ECU

284Note: This fault only applies to the condition that the system can communicate with the scan
meter (ABS ECU Power supply is normal), and there is no DTC set. 2 Afte r the e ngine is s tarte d, AB S
Warning Light is normally onLik e ly Caus e s
[De s cription]
One of the Likely Ca use s is tha t
ABS warning light drive module is da mage d or
there is a n ope n in the ABS wa rning light
circuit.z The warning light drive module is da mage d
z A B S w a r ning light dr ive module c ir c uit ope n
z ABS ECU is damagedRepair the wire harnessCheck whether there is an open circuit in the wire be-
tween the ECU and ABS warning light drive module Check the ABS warning light drive moduleReplace Abn. No Ye s Replace the ABS ECUOk

285 3 Abno rmal AB S o pe ratio n Lik e ly Caus e s
[De s cription]
It is in c lose c onne ction with the
driver status and the road conditions and is
difficult to dia gnose. Howeve r, if there is no
DTC me mory, the following inspec tions c an be
performed.z Imprope rly ins ta lle d s e ns or
z Sensor wire ha rness faulty
z Da ma ge d se nsor
z Da ma ge d ring ge a r
z Foreign obje cts in the se nsor
z Damaged wheel bearing
z Damaged ABS HCU
z Damaged ABS ECUIs the sensor installed correctlyCheck the sensor output volt-
age Check each sensorCheck each sensor ring gearCheck the wheel bearing clearance Check the ABS ECU socket and
the middle connectorNo
Installed it correctly
Abn.
Abn.
Abn.
Abn. Ok
Ye s
No
Ok
OkReplace
Replace
Repair
the connectorUse scan meter for HCU di-
agnosis Ye s Does the fault reoccur? Ye s
NoRefer to
"Occasional
Problem
Service Key
Points"Replace the ABS HCURemove the ABS ECU connector,
check whether the resistances
among the following terminals are
within specification?
Standard: 1.0~1.3K¸
Shake the sensor wire harness and
connector while measuring them
LF: 1-2
RF: 19-20
LR: 5-6
RR: 22-23Abn.
Replace
or Repair Ye s
OkRepair the
wire har-
ness or
connectoReplace the ABS HCUAbn.

288 6 No DTC output
（can no t
communicate with the s can me te r
）Lik e ly Caus e s
[De s cription]
It ma y be the ABS ECU powe r
supply c ircuit or dia gnosis wire circ uit tha t c an
not communicate with the scan meterz Burned fuse
z Diagnosis wire broke n or connec tor disc onne c ted
z Damaged ABS ECU
z Scan meter faultyCan the scan meter commu-
nicate with the MK-20 ABS
ECU on other vehicles? ABS scan meter faulty, check it af-
ter repairing itReplaceCheck the power cable, ground wire
and diagnostic wire in the diagnos-
tic interface Check the diagnostic interface or wire harness No
Ye s
No
Ye s
ContinuityCheck ABS power supply
fuse OkReplace the ABS ECURepair the
diagnostic
interface or
harnessIs there any scan meterAbn.Remove the ABS ECU
connector, check whether
there is continuity between
terminal 7 in the ABS wire
harness and the terminal 8 in
the diagnostic interfaceAbn.NoNo

289III. ABS System CheckIte mIgnition
Switch ShiftTe rminal Pole Standard Unit
Battery Voltage OFF 25-8 10.1～
14.5 V
Battery Voltage
（
s ole noid va lve）OFF 9-24 10.1～
14.5 V
P owe r supply
in s ula t ionOFF 8-4 0.00～
0.5 V
Ground insula tion OFF 8-24 0.00～
0.5 V
P owe r supply
volta geON 8-4 10.1～
14.5 V
OFF Warning light goe s off Visua l inspec tion
ON Wa rning light goes on Visua l inspec tion
OFF Warning light goe s off Visua l inspec tion
ONWa rning light goes on
for a bout 1.7 se c onds
then goes offVisual inspection
B r a ke light s w it c h
peda l not de presse dON 8-18 0. 0～
0.5 V
B r a ke light s w it c h
peda l de pre sse dON 8-18 10. 0～
14.5 V
Diagnostic interface OFFDia gnostic inte rfa c e
K & 70.0～
0.5Ω
LF Wheel Speed
Sensor ResistanceOFF 1-20 1.2～
1.3 KΩ
RF Wheel Speed
Sensor ResistanceOFF 19-20 1.2～
1.3 KΩ
LR Wheel Speed
Sensor ResistanceOFF 5-6 1.0～
1.3 KΩ
RR Wheel Speed
Sensor ResistanceOFF 22-23 1.0～
1.3 KΩ
LF Whe e l Se nsor
Output VoltageOFF 1-2 3.4～
14.8 MV/Hz
RF Whe e l Se nsor
Output VoltageOFF 19-20 3.4～
14.8 MV/Hz
LR Whe e l Se nsor
Output VoltageOFF 5-6 >12.2 MV/Hz
RR Wheel Sensor
Output VoltageOFF 22-23 >12.2 MV/Hz
Spee d Se nsor Output
Voltage RatioABS Warning LightECU not connected
Connect ECUMaximum peak voltage
Minimum peak voltage≦2

292Section 3 Removal and InstallationI.Precautions for Removal1. Use the scan meter to locate the fault causes before proceeding to service.
2. wipe the surface clean with the cleaning agent without mineral oil before service; be careful to keep it
clean during service, only the lint-free cloth can be used to wipe the removed parts.
3. Only the original spare part can be used, and the package of the new spare part shall not be removed until
the installation.
4. Return liquid pump motor and the HCU is a type of integral structure and can not be separated.
5. When the system is opened, do not use compressed air or move the vehicle.
6. Use proper plug to clog each hydraulic outlet as soon as the ABS assembly is removed.
7. Remove other components that may interfere.
8. Please use the DOT 4 brake fluid, do not use the mineral oil.
9. Use the brake fluid to immerse the seal and the O ring, do not use the engine oil or brake grease.
10. After service, check the regular brake system and ABS brake function for normal and reliable operation.
11. Check all hydraulic pipe union for leakage.II. HECU Removal1. Turn off the ignition switch and disconnect the battery negative ground cable.
2. Remove the wire connector from the ABS HECU assembly.
3. Depress the brake pedal >60mm and hold it with the pedal retainer to close the master cylinder center
valve so that the brake fluid will not flow out from the outlet when the system is opened.
4. Put a clean cushion under the hydraulic regulator.
5. Remove the brake pipe (A, B) on the HCU connected to the master cylinder and place the mark, then
use a plug to clog the outlet immediately.
6. Remove the brake fluid pipe(1-4) leading to the wheels, then use a plug to clog the outlet immediately.
7. Remove the nut attaching the HECU to the bracket.

2938. Remove the whole HECU from the bracket.
ABS HECU Assembly
ABS HECU Brake Pipe Removal Schematic

294III. HCU Replacement1. Depress the retaining clip on the union joint side
and remove the cylinder motor wire harness.
2. Remove the 4 screws as shown in the figure, the
removed old screw can not be reused.
3. Separate the HCU from the ECU.
4. Install the new HCU to the ECU.
5. Use new screw to attach the ECU to the HCU,
tighten the torque: 3+1Nm.
6. Connect the motor wire harness, be careful that
the retaining clip shall be in place.IV. ECU Replacement1. Depress the retaining clip on the union joint side and remove the
wire harness.
2. Remove the 4 screws as shown in the figure and discard them
3. Remove the HCU from the ECU.
4. Install the new ECU to the HCU.
5. Use the new screw to attach the ECU to the HCU, tighten the
torque3+1Nm.
6. Connect the motor wire harness, be careful that the retaining clip
shall be in place.

295V. ABS Assembly ReinstallationNote: the plug of the ABS assembly hydraulic outlet can only be removed after the brake pipe is
installed, lest the foreign object will enter the brake system.1. Install the ABS assembly to the bracket, tighten the torque: 20+4Nm.
2. Remove the plug of the hydraulic outlet, installed the brake pipe. Make sure that the brake pipe is
correctly installed.
3. Install the brake pipe connected to the master cylinder.
4. The brake pipe torque is 12+4Nm (M10 x 1) and 15+3Nm (M12 x 1).
5. Fill the new brake fluid into the reservoir until the liquid level reach the MAX and bleed it as specified.
6. With the ignition switch ON, ABS Warning Light must goes on for 1.7 seconds then goes off.
7. Clear the DTC memory, check if there is DTC again.
8. Drive the vehicle to confirm the ABS function (you must feel that the pedal rebound).VI. ECU ProgramNote: when replacing the HECU or ECU, you shall program the new ECU, otherwise the ABS
Warning Light flashes and the system can not operate normally.Use the scan meter to program the ECU based on the following procedure:Connect the scan meter with the diagnostic interfaceSelect function 07, Press OK button to confirmEnter code 01901 and Press OK button to confirmSelect function 07, Press OK button to confirm, quit the diagnosticEnd