Chery A18. Manual — part 48

4

2. Precautions for fault diagnosis

ABS adopts electric hydraulic control, in condition of normal operation, following
phenomenon are normal, while not be fault.

Phenomenon

Description

Self checking sound of
system

After started engine, impacting sound might be sent out from
engine room of engine, the sound is self-checking sound of
ABS, while not abnormal.

Sound

vocalizing

during

action of ABS

1. Sound of electromotor in ABS hydraulic unit.
2. Sound generating from libration with brake pedal.
3. During operation of ABS, impacting sound of suspension, or

noise of friction between tire and ground might be caused
from brake.

Note: Tire might be sent out noise during normal operation of

ABS.

ABS

is

activated,

but

braking distance is too long

On snow or sandstone ground, braking distance of vehicle that
has ABS maybe slip longer distance than vehicle has no ABS.
Please drive carefully while driving on abovementioned ground.

3. Operational method and function introduction of fault-diagnosing

device

3.1 Operational method

* Connect fault-diagnosing device to diagnosing socket under condition of

break, then switch on ignition switch.

* Input 03 and press key of OK to enter operational condition of ABS.
* Input function code you wanted.
* Input 06 and press OK to exit.
* Disassemble fault-diagnosing device after break.

3.2 Introduction on function code

* Function01-display state information
* Function02-fault query
* Function03-diagnosis on hydraulic control unit
* Function04-Charging and air bleed
* Function05-clear fault record
* Function06-complete, exit
* Function07-Coding of controller
* Function08-Display measuring data (such as wheel speed signal etc.)

3.3 Functional key

*

←

-

Cancel, modify input data and current menu

* OK

-

Confirm input

*

→

-

5

4. Servicing point of adventitious fault

In electric control system, instantaneous loose contact maybe occurs at position of
electric loop and input/output signal, and cause adventitious fault or remain fault code
during ECU self inspection. In case that fault reason existing continuously, it is
possible to find out abnormal parts by inspecting according to fault code. In some
case, fault reason maybe disappears automatically, so it is difficult to find out the fault
reason.

In this condition, it is possible to check if fault occurs again by simulate fault
according to flowing measure.
I.

In case that vibration might be primary reason:

* Shake connector lightly.
* Shake wire harness lightly.
* Shake sensor lightly.
* Shake other operating parts lightly (such as wheel bearing).

Note: It is necessary to replace new parts if the wire harness is twist off or broke from
too big tension. Occasional open/short circuit with sensor might be caused from
upward /downward movement of suspension system, so it is necessary to conduct
actual driving test while inspect sensor signal.

II. In case that overheat or overcool might be primary reason:

* Heat the parts that be considered as failure one with blowing machine.
* Check if cold welding occurs by using cooling nebula.

III. In case that too big contact resistance of power loop might be primary reason:

* Open switches of all electrical equipments, which include head light switch

and defrost switch.

6

5. MK 60 ABS System

5.1 Inspection on ABS warning lamp

Check if warming lamp lights according to following mode:
I.

Turn ignition switch to “ON”, ABS warning lamp lights for 1.7 seconds, then
extinguishes.

II. Please check fault code if abovementioned did not occur.
III. Please refer to fault list of faultless code if warning lamp did not light completely.

5.2 Reading of state information

After connected diagnostic device, input 03 in position of address (Addresswort) and
press key of OK, the screen should display following state information:

1. For example, ECU figure number and version number

********

2. Code (Codierung)：00001

5.3 Read fault code

Input 02 in position of function selection (Funktionanwählen), and press OK to
display quantity of fault. The display fault code and content of each fault in order by
pressing key of “

∧

”.

5.4 Eliminate fault code

Input 05 in position of function selection (Funktionanwählen) and press key of OK to
eliminate fault code. In case that fault code is not eliminable, it is denoted that the
fault exists all along. In case that saved faults are eliminable, it is denoted that the
fault is an adventitious fault, which could be checked only in mode of actual driving.

5.5 Display mode of fault code

System problems

Displayed code

Had not occurred before

No fault code

No problem existing
(ABS warning lamp does
not light)

Occurred before

Adventitious fault code

Had not occurred before

Nonadventitious fault code

Problem is existing
(ABS warning lamp lights)

Occurred before

Adventitious

fault

code

and

nonadventitious fault code

7

6. Diagnosis of hydraulic control unit

6.1 It is possible to diagnose hydraulic control unit by using fault-diagnosing

device. Input 03 in position of function selection, and operate according to
following steps.

Step

Action of operator

Displaying content

Result in

normal

condition

01

Hydraulisch ABS Pumpe V64
(Test of hydraulic pump)

02

Bremse Bestätigung (Tread brake pedal)

03

EVL: 0V AVL: 0V Rad blockiert
(Normally open valve: 0V Normally closed
valve: 0V lock Break?)

Lock break

04

EVL: UBAT AVL: 0V Rad blockiert
(Normally open valve: electrified Normally
closed valve: 0V Lock Break?)

Lock break

05

EVL: UBAT AVL: UBAT Rad frei
(Normally open valve: electrified Normally
closed valve: Electrified If wheel could rotate
freely?）

Wheel

could

rotate

freely,

pedal rebounds,
operating noise
of pump motor
is audible

06

EVL: UBAT AVL: 0V Rad frei
(Normally open valve: electrified Normally
closed valve: 0V If wheel could rotate
freely?)

Wheel

could

rotate freely

07

Tread brake pedal all
along

EVL: 0V AVL: 0V Rad blockiert
(Normally open valve: 0V Normally closed
valve: 0V Lock Break?)

Lock break
Pedal

goes

down
automatically
and lightly

08

Loose brake pedal

Bremse lösen
(loose brake pedal)

6.1 Perform above test with each wheel in order: left front

∧right front∧left

rear

∧ right rear