ECU GEELY CK 2008 Repair Manual

280 5 DTC 01044 Likely Cause s
[De s cription]
Whe n the ECU programming is
not consistent with the ABS wire harness pin
connection, this DTC is setz ABS wire harne ss pin c onne c tion e rror
z ABS ECU programming e rrorRepair the wire harnessUse the scan meter to check whether the ABS ECU
programming is correct
Correct: 01901 Check the ABS wire harness pin connector for continuity
Pin connector: ABS ECU pin 12 and 14Reprogram
Abn. Ye s No

281 6 DTC 00668 Like ly Cause s[De s cription]When powe r supply termina l 30
doe s not supply the volta ge or the volta ge is too
high, this DTC is se t.z ABS system fuse is broken
z Ba tte ry Volta ge too low or high
z ABS wire ha rne ss connec tor is da mage d
z ABS ECU is damagedCheck the ABS system 50A fuseDisconnect the ABS wire harness from the
ECU, turn the ignition switch to ON, mea-
sure the voltage among the following termi-
nals of the ABS wire harness
Terminal 8 and 9 9.5-16.5V
Terminal 24 and 25 9.5 - 16.5V
Terminal 8 and 4 9.5 -16.5V Check the ABS wire harness connectorRetest. Abn. again?Check the Battery voltage Refer to "Occasional Problem
Service Key Points"Replace the ABS ECU
Abn.Abn.
Ok
Ok
Ok
Ye s NoReplace the fuse
Repair the connector Abn.

282 7 DTC 01130 Like ly Cause s[De s cription]When ABS is affected by high
fre quenc y ele c troma gnetic wave or the mic ro-
processor determines that the input vehicle
speed is suspect, this DTC is setz High frequency electromagnetic wave interference
z Da ma ge d se nsor or its wire ha rness
z Damaged ABS ECUReplace the ABS ECUCheck the sensor output voltage Check the wire harness between
the ECU and the sensorReplace the sensor Abn.
Ok NoCheck the sensor Ok

283II. Non-DTC Problem Inspection Table1 With ignition s witch ON (Engine Off),
the AB S warning lig ht do e s no t g o o nLike ly Caus e s[De s cription] ABS Wa rning Light doe s not go
on, the like ly c a use ma y be the ope n in the
warning light powe r supply c irc uit, burne d bulb
or dama ged wa rning light drive module .z Burned fuse
z A B S W a r ning L ight B ulb bur ne d
z Power supply circuit open
z ABS Wa rning Light Drive Module da mage dCheck the ABS warning light
fuse in the fuse blockRemove the ECU connector,
does the warning light goes on
with the ignition switch ON? Check whether the ABS
warning light is burnedCheck whether the warn-
ing light power supply cir-
cuit and ground circuit in the
wire harness is openCheck the connector of the
warning light power supply
circuit and ground circuit in
the wire harness Does the fault reoccur?Abn.
Replace
Repair the wire harnessNo
Ye s
Abn.
Abn. Ok
Ye s No
Ok
OkReplace
Repair the wire
harness
Repair the connectorCheck whether the wire in the
ABS wire harness connecting
the ABS warning light drive
module and the ECU is short
to ground Ye s Replace the warning light
drive module Ye sNoRefer to "Occa-
sional Problem
Service Key Points"

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