wheel GEELY CK 2008 Repair Manual

273IV. DTC Display Method
V. HCU DiagnosisUse the scan meter to diagnose the Hydraulic Control Unit (HCU), select the "3 HCU diagnosis" in the
options and perform the following procedures.
* Perform the above step 2 - 8 test for each wheel in the following order LF RF LR RR.
* If the result of some one of the above steps is different from the normal result, it indicates that the
corresponding element fails the normal operation, please check the corresponding element.
* You can use “ESC” button to end the test to return the function menu in any place in the screen where
there is “return” displayed to return to the function menu.Code Displa ye d
Ne ve r ha ppe ne d be fore No DTC
Happened before Occasional DTC
Ne ve r ha ppe ne d be fore Non-occ a sional DTC
Happened beforeOccasional DTC and Non-
occasional DTC System P roblem
The re is no proble m current ABS
Warning Light does not light up）
The problem still e xists（
ABS
Wa rning Light goe s on）Step Action Screen Display Normal Result
1 HCU dia gnosis – hydra ulic pump te st P ump motor operate s
2 LF Wheel——Depress the brake pedal
3LF Whe e l—— norma lly ope n va lve
ope n, norma lly c losed va lve c lose d,
wheel locked？Wheel locked
4LF Whe e l—— norma lly ope n va lve
closed, normally closed valve closed,
wheel locked？Wheel locked
5LF Wheel — — normally open valve
close d, norma lly close d va lve open,
wheel can rotate freelyWheel can rotate freely, the
pe da l re bound, the c ylinde r
motor ope ra ting noise is a udible
6LF Whe e l—— norma lly ope n va lve
closed, normally closed valve closed,
wheel can rotate freelyWheel can rotate freely
7LF Wheel — — normally open valve
ope n, normally c lose d va lve close d,
wheel locked？Wheel locked, the pedal sag
slightly
8Release the brake
pe dal De pre ss and hold
the brake pedal→→→

275VIII. ABS ECU Connector Pin LayoutABS ECU Connector (End Views)
Electrical Wiring DiagramCombination MeterABS Warning Light
Drive ModuleABS ECU
ABS RR Wheel Sensor
ABS LR Wheel Sensor ABS RF Wheel Sensor
ABS LF Wheel Sensor
Brake Lamp Switch

277Whether the sensor is installed
correctlyCheck the sensor Output Volt-
age at the ABS ECU25 pin
connector Check each sensorCheck each sensor ringgearCheck the wheel bearing
clearance Check the wire harness be-
tween the sensor and the
ABS ECUNo
Install it correctly
Replace the ABS ECUAbn.
Abn.
Abn.
Abn. Ye s
Normal Normal
Normal
NormalReplace
Replace
Replace or Repair 2 DTC 00283,00285,00283,00285,
00287,00290Like ly Caus e s
[De s cription]
When no open in the circuit can
be detected and there is no signal output when
the vehicle speed exceeds 20km/h, this DTC is
set.
[H int]
The likely c ause ma y be the se nsor
ina dvertently not insta lle d, short c ircuit in the
sensor coil or wire harness, excessive
clearance between the sensor and the ring gear
or dama ged ring ge a r.z
T h e s e n s o r is n o t in s t a lle d in a d v e r t e n t ly
z
Short c irc uit in the se nsor c oil or w ire ha rne ss
z
Excessive big clearance between the sensor and
the ring gea r
z
The ring gea r is not insta lle d ina dverte ntly
z
ABS ECU failure

278Whether the sensor is installedcorrectlyCheck the sensor Output Volt-
age at the ABS ECU25 pin
connector Check each sensorCheck each sensor ringgearCheck the wheel bearing
clearance Check the wire harness be-
tween the sensor and the
ABS ECUNo
Install it correctly
Replace the ABS ECUAbn.
Abn.
Abn.
Abn. Ye s
Normal Normal
Normal
NormalReplace
Replace
Replace or Repair 3 DTC 00283, 00285, 00287, 00290 Likely Cause s
[De s cription]
When the vehicle speed exceeds
20km/h, if the se nsor signa l goe s be yond the
tolerance range, this DTC is set.
[Hint]
The we ak signa l ma y re sult from the
poor c onne c tion or short c irc uit of the se nsor
c oil or wire ha rness, da ma ge d ring gea r or
excessively big clearance between the sensor
a nd the ring gea r.z The inte rmitte nt poor connec tion or short circ uit of
the se nsor c oil or wire ha rne ss
z Excessively big or small clearance between the
se nsor a nd the ring gea r
z Da ma ge d ring gea r
z Exc e ssive ly big be a ring c lea ra nc e
z ABS ECU failure

279 4 DTC 00283, 00285,00287, 00290 Like ly Cause s
[De s cription]
When there is recognized open
or short circuit in the sensor, this DTC is set.
[Hint]
The likely c ause ma y be the poor
c onne ction of the sensor, short circ uit in the coil
or wire ha rne ss, or fault in the se nsor signa l
proce ssing c irc uit in the ABS ECUz Ope n c irc uit in the se nsor c onne ctor or coil
z Short circuit in the sensor coil
z The se nsor c onne ctor or wire harne ss is short to
ground or powe r supply
z Fault in the sensor signal processing circuit in the
ABS ECURepair the connectorCheck the sensor on each wheelRemove the ABS ECU connector, check
whether the resistances among the following
terminals is within the specification?
Standard:
1.0~1.3K
LF: 1-2K
RF: 19-20K
LR: 5-6K
RR: 22-23K Check the corresponding sensor connectorDoes the fault reoccur?Check the wire harness between the ECU and
the sensor Refer to "Occasional Prob-
lem Service Key Points"Replace the ABS ECU
Abn.
Abn. Normal
Normal
Normal
Ye s Normal Ω,
Ω,
Ω,
Ω,
Ω,

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.

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

290Note: This inspection uses the "03 HCU diagnosis" of the Scan Meter.Ite m Ke y Switch Actio n Standard No te s
ON Depress the pedalWhen LF wheel can not
rotate, the pedal does
not de sce ndNormally-closed
valve inspection
ON（
two va lve s
a nd pumps a re
energized
simultaneously）Depress the pedalLF wheel can rotate
free ly, the pe da l doe s
not de sce ndNormally-open
va lve ins pe c t ion
ON Depress the pedalWhen RF wheel can not
rotate, the pedal does
not de sce ndNormally-closed
valve inspection
ON（
two va lve s
a nd pumps a re
energized
simultaneously）Depress the pedalRF wheel can rotate
free ly, the pe da l doe s
not de sce ndNormally-open
va lve ins pe c t ion
ON Depress the pedalWhen LR wheel can not
rotate, the pedal does
not de sce ndNormally-closed
valve inspection
ON（
two va lve s
a nd pumps a re
energized
s imult a ne ous ly
）Depress the pedalLR wheel can rotate
free ly, the pe da l doe s
not de sce ndNormally-open
va lve ins pe c t ion
ON Depress the pedalWhen RR wheel can
not rota te, the pe dal
does not de sc e ndNormally-closed
valve inspection
ON（
two va lve s
a nd pumps a re
energized
simultaneously）Depress the pedalRR wheel can rotate
free ly, the pe da l doe s
not de sce ndNormally-open
va lve ins pe c t ion RR wheel
norma lly-ope n
and closed valves
seal performance No te : The v acuum bo o s te r mus t hav e v acuum applie d whe n pe rfo rming the fo llo wing
ins pe ction.
LF Wheel
norma lly-ope n
and closed valves
seal performance
RF wheel
norma lly-ope n
and closed valves
seal performance
LR wheel
norma lly-ope n
and closed valves
seal performance

291IV. ABS Operation Inspection1. Check the Wheel Speed Sensor Output Voltage
1Check whether the clearance between the wheel speed sensor and the ring gear is within the specification
For front wheel standard value, refer to "Front Wheel Sensor Installation Drawing"
For rear wheel standard value, refer to "Rear Wheel Sensor Installation Drawing"
3Jack up the wheel and release the manual brake
2Remove the ABS wire harness, measure at the wire harness connector
4Rotate the wheel at the speed of 1/2 turn/second, and use the multimeter or oscilloscope to measure the
output voltage
Terminal 1-2
Terminal 19-20
Terminal 5-6
Terminal 22-23
Output Voltage
zWhen use the multimeter to measure
For front wheel, refer to "Front Wheel Sensor Drawing".
For rear wheel, refer to "Rear Wheel Sensor Drawing".
zWhen use the oscilloscope to measure
For front wheel, refer to the related standard.
For rear wheel, refer to the related standard.
5The fact that the output voltage is not within the above range may result from the following causes:
zExcessive clearance between the sensor and the ring gear.
zSensor fault.
zCheck the sensor resistance£¨1.0 - 1.3k¦¸£©.
zSelect the 4 points on the ring gear to check the clearance (ring gear distortion) between the ring
gear and the wheel speed sensor.
2.Check the Hydraulic Control Unit (HCU).
1Jack up the vehicle, make sure the wheel can rotate freely.
2Release the manual brake.
3Turn the ignition switch to ON after connecting the scan meter, do not start the engine this time.
4Refer to the HCU Diagnosis for inspection.
Note: when connecting or removing the scan meter, the ignition switch must be turned to OFF.

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.