Geely CK Series 2007 Workshop Manual page 280

IV. DTC Display Method
There is no problem current ABS
Warning Light does not light up ）
The problem still exists （ ABS
Warning Light goes on ）
V. HCU Diagnosis
Use the scan meter to diagnose the Hydraulic Control Unit (HCU), select the "3 HCU diagnosis" in the
options and perform the following procedures.
Step Action
1
2
3
4
Depress and hold
the brake pedal
5
6
7
Release the brake
8
pedal
* Perform the above step 2 - 8 test for each wheel in the following order LF
* 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.
System Problem
Never happened before
Happened before
Never happened before
Happened before
Screen Display
HCU diagnosis – hydraulic pump test
LF Wheel——Depress the brake pedal
LF Wheel—— normally open valve
open, normally closed valve closed,
wheel locked ？
LF Wheel—— normally open valve
closed, normally closed valve closed,
wheel locked ？
LF Wheel — — normally open valve
closed, normally closed valve open,
wheel can rotate freely
LF Wheel—— normally open valve
closed, normally closed valve closed,
wheel can rotate freely
LF Wheel — — normally open valve
open, normally closed valve closed,
wheel locked ？
Code Displayed
No DTC
Occasional DTC
Non-occasional DTC
Occasional DTC and Non-
occasional DTC
Normal Result
Pump motor operates
Wheel locked
Wheel locked
Wheel can rotate freely, the
pedal rebound, the cylinder
motor operating noise is audible
Wheel can rotate freely
Wheel locked, the pedal sag
slightly
→ → →
RF LR RR.
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