Geely CK (2008). Manual part — 73
Geely CK (2008). Manual part - 73
289
III. ABS System Check
Item
Ignition
Switch Shift
Terminal Pole
Standard
Unit
Battery Voltage
OFF
25-8
10.1~14.5
V
Battery Voltage
(
solenoid valve)
OFF
9-24
10.1~14.5
V
Power supply
insulation
OFF
8-4
0.00~0.5
V
Ground insulation
OFF
8-24
0.00~0.5
V
Power supply
voltage
ON
8-4
10.1~14.5
V
OFF
Warning light goes off Visual inspection
ON
Warning light goes on Visual inspection
OFF
Warning light goes off Visual inspection
ON
Warning light goes on
for about 1.7 seconds
then goes off
Visual inspection
Brake light switch
pedal not depressed
ON
8-18
0.0~0.5
V
Brake light switch
pedal depressed
ON
8-18
10.0~14.5
V
Diagnostic interface
OFF
Diagnostic interface
K & 7
0.0~0.5
Ω
LF
Wheel Speed
Sensor Resistance
OFF
1-20
1.2~1.3
KΩ
RF
Wheel Speed
Sensor Resistance
OFF
19-20
1.2~1.3
KΩ
LR Wheel Speed
Sensor Resistance
OFF
5-6
1.0~1.3
KΩ
RR Wheel Speed
Sensor Resistance
OFF
22-23
1.0~1.3
KΩ
LF Wheel Sensor
Output Voltage
OFF
1-2
3.4~14.8
MV/Hz
RF Wheel Sensor
Output Voltage
OFF
19-20
3.4~14.8
MV/Hz
LR Wheel Sensor
Output Voltage
OFF
5-6
>12.2
MV/Hz
RR Wheel Sensor
Output Voltage
OFF
22-23
>12.2
MV/Hz
Speed Sensor Output
Voltage Ratio
ABS Warning Light
ECU not connected
Connect ECU
Maximum peak voltage
Minimum peak voltage
≦2
290
Note: This inspection uses the "03 HCU diagnosis" of the Scan Meter.
Item
Key Switch
Action
Standard
Notes
ON
Depress the pedal
When LF wheel can not
rotate, the pedal does
not descend
Normally-closed
valve inspection
ON(two valves
and pumps are
energized
simultaneously)
Depress the pedal
LF wheel can rotate
freely, the pedal does
not descend
Normally-open
valve inspection
ON
Depress the pedal
When RF wheel can not
rotate, the pedal does
not descend
Normally-closed
valve inspection
ON(two valves
and pumps are
energized
simultaneously)
Depress the pedal
RF wheel can rotate
freely, the pedal does
not descend
Normally-open
valve inspection
ON
Depress the pedal
When LR wheel can not
rotate, the pedal does
not descend
Normally-closed
valve inspection
ON(two valves
and pumps are
energized
simultaneously)
Depress the pedal
LR wheel can rotate
freely, the pedal does
not descend
Normally-open
valve inspection
ON
Depress the pedal
When RR wheel can
not rotate, the pedal
does not descend
Normally-closed
valve inspection
ON(two valves
and pumps are
energized
simultaneously)
Depress the pedal
RR wheel can rotate
freely, the pedal does
not descend
Normally-open
valve inspection
RR wheel
normally-open
and closed valves
seal performance
Note: The vacuum booster must have vacuum applied when performing the following
inspection.
LF Wheel
normally-open
and closed valves
seal performance
RF wheel
normally-open
and closed valves
seal performance
LR wheel
normally-open
and closed valves
seal performance
291
IV. ABS Operation Inspection
1. Check the Wheel Speed Sensor Output Voltage
1
Check 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"
3
Jack up the wheel and release the manual brake
2
Remove the ABS wire harness, measure at the wire harness connector
4
Rotate 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
When use the multimeter to measure
For front wheel, refer to "Front Wheel Sensor Drawing".
For rear wheel, refer to "Rear Wheel Sensor Drawing".
When use the oscilloscope to measure
For front wheel, refer to the related standard.
For rear wheel, refer to the related standard.
5
The fact that the output voltage is not within the above range may result from the following causes:
Excessive clearance between the sensor and the ring gear.
Sensor fault.
Check the sensor resistance£¨1.0 - 1.3k¦¸£©.
Select 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).
1
Jack up the vehicle, make sure the wheel can rotate freely.
2
Release the manual brake.
3
Turn the ignition switch to ON after connecting the scan meter, do not start the engine this time.
4
Refer to the HCU Diagnosis for inspection.
Note: when connecting or removing the scan meter, the ignition switch must be turned to OFF.
292
Section 3 Removal and Installation
I.Precautions for Removal
1. 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 Removal
1. 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.
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