2008 GEELY CK Workshop Manual

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.

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

296VII. Fill the liquid and bleedAfter replacing the HECU, bleed the second HECU circuit in addition to the filling and bleeding of the regular
brake system. Use the scan meter to perform the following procedure:Fill the fluid and bleed based on the regular brake system
until there is no air bubble in the transparent hoseConnect the scan meter with the diagnostic interfaceSelect function 04, Press OK button to confirmDepress the brake pedal and keep the hydraulic cylinder pushrod reboundRelease the brake pedal, loosen the left and right brake caliperbleeder screw, press "" buttonDepress the brake pedal 10 times, tighten the left and right
brake caliper bleeder screw, press "" buttonRepeat the above I II III steps 7 times and press "" buttonThe screen display the end of the bleed, press
"" button to return to "function selection" menuSelect function 06, Press OK button to confirm, quit the
diagnostic modeEnd →↑
↑
↑

297Part IV Air Conditioner and Inside &
Outside TrimChapter 1 A/C SystemA/C system consists of refrigerating and heating system. The Refrigeration system mainly comprises
compressor, condenser and evaporator. The refrigerant circulation absorbs the heat in the air and discharge
the vapour to lower the temperature in and dehumidify the compartment. The heating system is mainly
composed of heat exchanger and heater. It heats the compartment throught the heat exchanger by heating
the air with the heat from the cooling water in the engine. The control of air temperature, humidity and
velocity of flow in the compartment is realized by independent or joint working of heating and Refrigeration
system.Section 1 The Structure & Working Principle of Refrigeration SystemThe structure of Refrigeration system is shown in Figure 1.
Figure 1 The Structure and Working Principle of Refrigeration System
1. Compressor 2. Condenser 3.Receiver/Drier
4.Pressure Relief Valve 5.Expansion Valve 6.Evaporator 7.Blower
Refrigeration system uses vapor compressing refrigeration cycle, comprising the compressor, condenser,
pressure relief valve, evaporator, blower , expansion valve, receiver/drier and pipe.
It's working principle is as shown in the Figure 1. The compressor (1) sucks in the refrigerant gas in the