ECU GEELY CK 2008 Repair Manual

262Section 3 Removal & InstallationI. SRS ELECTRONICAL CONTROL UNIT (ECU)1. Operations prior to Removal
(1) Turn the ignition switch OFF.
(2) Remove negative (-) terminal cable of the battery. Put it in a proper position or wrap it up with insulating
tape.
2. Removal procedures:
(1) Remove the central passage side cover plate (or remove auxiliary console).
(2) Remove the connectors to SRS ECU.
(3) Remove ECU.
3. Installation procedures:
(1) Install ECU.
(2) Install the connectors to SRS ECU.
(3) Install the central passage side cover plate (or install auxiliary console).
(4) Connect negative (-) terminal cable of the battery.
4. Key points for Installation:
(1) Install ECU.
(2) Check after installation.
1Turn the ignition switch ON.
2The warning light goes on within 6s, and then goes out.
(3) If the light doesn't go out, check the trouble and eliminate it.NOTICE1. Work must be started 60s after the negative (-) terminal cable is detached from battery. The detachednegative (-) terminal cable shall be protected with insulating tape for insulation.
2. Never attempt to dismantle or repair an ECU. If there is any trouble, replace the ECU with a new one.
3. Prevent the ECU from shock or vibration. If pitting, crack or distortion is found, replace the ECU with
a new one.
4. Every time an airbag is deployed, the ECU shall be replaced with a new one.
5. When disassembling or maintaining the parts around ECU, attention must be given to avoid contacting
the ECU.NOTICE
If the ECU cannot be installed correctly, the airbag will not act normally.

2635. Check:
1 ECU case for pitting, crack and distortion.
2 The joint for damage and distortion.
For other ECU checkings, see Troubleshooting.II. AIRBAG ASSEMBLY & CLOCK SPRING1. Operations prior to removal
(1) Take out the ignition key after the steering wheel and front wheel are adjusted to straightforward direction.
(2) Remove negative (-) terminal cable from the battery.
2. Removal procedures of the driver airbag assembly:
(1) Unscrew the screws of the two sides.
(2) Disconnect the connector of the wire harness.
(3) Remove the components of airbag assembly.
(4) Remove steering wheel.
3. Removal procedures of clock spring:
(1) Remove the driver airbag assembly (disconnect the connector).
(2) Remove steering wheel gently (see the precautions).
(3) Open the upper closure of the combination switch, locate and
disconnect the connector of wire harness in the lower end.
(4) Remove clock spring from the steering wheel.
4. Installation procedures of the driver airbag assembly
(1) Pre-Check
ySteering wheel
yConnect the wire harness
yDriver airbag assembly
(2) Screw up the installation screws of the two sides.
(3) Connection of the negative (-) terminal of the battery
(4) Check after installation.NOTICE
If pitting, crack or distortion is found on an ECU, replace it with a new one.NOTICE
Put the removed driver airbag
assembly upside down in a clean
and dry place for care.NOTICE
Put the removed clock spring in
a clean and dry place for care.

2702Prepare two 6m plus wire harnesses for deployment, connect the other two ends to avoid unexpected
deployment in case of static electricity (see the figure below).
3Touch the body of the vehicle with hands for static electricity elimination.
NOTICE:
The above-mentioned procedures can prevent the unexpected deployment due to static electricity and shall
therefore be performed strictly.
4Cut off the wire harnesses of the driver airbag assembly and connect them with the two wire harnesses
for deployment, and make sure to wrap up the connecting location with insulating tape for insulation (see
the figure below).
5Install the unused bolts on to the inside bolt of the driver airbag assembly, and tie a thick wire securing the
wheel rim.
6Pass the deployment wire harness of the driver airbag assembly through an old tire with rim, and fix
upwards the driver airbag assembly by means of the wire connected to the bolts, etc (see the figure
below).Wire Harness
for DeploymentShort Circuit Location6m plusPassenger AirbagWire Harness
for DeploymentShort
Circuit
Location
Insulating TapeAirbag AssemblyWire Harness for Deployment

272Chapter 8 MK-20 ABS SystemSection 1 ABS DiagnosisI. Check the ABS Warning Light1. Check the ABS Warning Light goes on as the following:
1Turn the ignition switch to ON, the ABS Warning Light goes on for about 1.7 seconds and then goes off.
2If the above condition is not satisfied, it indicates that there is a fault, please check the DTC.
3If the warning light does not light up at all, refer to the Non-DTC fault inspection table.II. The Reading of the information statusAfter connecting the scan meter, turn the ignition switch to¡°ON¡±, select the function menu item 01, press
OK to confirm, the screen will display the following information:
1. ECU drawing number and its version:
ABS MK20 IE
2. Code 01901III. Read and Clear the DTC1. After selecting the "02 Read DTC" in the function menu, it displays the total amount of the fault, if there
is no DTC, then it displays no DTC. Then, press OK button to proceed to next page to review the DTC
and its description. Generally, there is a P or O before the DTC, indicating that it is a Persistent fault or
Occasional fault. Persistent fault remains existing all the time, while the Occasional fault can be cleared
and is only able to reoccur during the driving.
Note:
The reading of the DTC can not be quitted middle way, you can return to the function menu only
after reading all the DTC.
Clear DTC
2. Select function menu item 05, press OK button to clear the DTC, if the DTC can not be cleared, it
indicates that the DTC represent exist all the time, if the saved DTC can be cleared, it indicates that it is
occasional fault can only be detected during the driving.

274VI. Troubleshooting Quick Index
VII. Non-DTC Problem Inspection Table IndexDTC Fault Description Diagnosis ResultInspection
Table No.Reference
Page
65535 ECU Da ma ge d
1276 ABS hydraulic pump Motor c a n not ope ra te 1 275
283 LF Whe e l Sensor 276
285 RF Whee l Se nsor 277
290 LR Whe el Se nsor 278
287 RR Whe e l Se nsor
1044 ABS progra mming e rror 5 279
668 P ower supply te rmina l 30 6 280
1130 Abnorma l ABS ope ra tion Signa l is not as spe cifie d 7 281Electrical or mechanicalfault2,3,4Inspection
Table No.Reference
Page
1282
2283
The bra ke forc e on both s ide s is not uniformThe brake force is insufficientABS operate s whe n the bra ke pe dal is slightly
depre ssed（vehicle is stationary）
ABS operate s whe n the bra ke pe dal is slightly
depre ssed（ve hic le is driving）
Whe n the ABS ope ra tes, the bra ke pe dal vibrate s
severely
4285
5286
6287 No DTC output（
failure in communicating with the scan meter） Fault Status
Turn the ignition switc h to “ON” (With engine off), ABS Wa rning
Light doe s not go on
Afte r the e ngine is sta rte d, the wa rning light doe s not go off
ABS
abnormal284 3
Brake peda l stroke is exc e ssive ly long
You ne ed to he a vily depre ss the brake peda l

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

276Section 2 ABS System CheckI. DTC Problem Inspection TableNote: If the Battery is excessively discharged, the motor will not be driven, therefore you must
check that the battery voltage is normal before performing the motor driving test. The vehicle
must be stationary during the test. 1 DTC 01276 Like ly Causes
[De s cription]
When the vehicle speed exceeds
20km/h, A BS EC U de te c ts tha t the motor c a n not
ope ra te normally and re c ord this D TC.
[Hint]
Whe n this proble m oc c urs, one of the
possible causes is that the wire harness between
the motor and the ECU is disconnected. Use the
sc a n me te r to pe rform the te st by a c tiva ting the
H CU func tion to drive the motor.z P ow e r supply is disc onnec ted or grounde dz Motor w ire ha rne ss is disc onnec te dz Motor is da ma ge dRemove the motor wire harness connector, connect
it to the Battery to see whether the motor operates?Check the fuse and ABS ECU connectorConnect the motor wire harness connectorTurn the
ignition switch to ONClear the DTC Use the scan
meter to Perform the HCU diagnosistor
Turn the ignition switch to ONDoes the fault reoccur?Refer to “Occasional Problem Service Key Point” Normal
Normal
NoAbn.
Abn.
Ye sReplace the HCU
Replace the fuse or wire harness
Replace the ECU

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,