2008 GEELY CK light

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.

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→→→

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

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

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

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