Chery A11. Manual - part 129

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

4. Intermittent Fault Repair Precaution

In electronic controlled system, instantaneous contact problem at circuit or signal input & output area may occur, causing

intermittment fault or fault code set during ECU self-check. If symptom continuously exists, determine defective part

referring to FAULT W/CODE DIAGNOSTIC CHART. The problem is hard to locate beacue fault source may disappear

at some time.

In such cases, simulate following condition and check if problem occurs again:

I. When viabrating is the main possible causes:

* Slightly wiggle connector;

* Slightly wiggle wiring harness;

* Slightly shake sensor;

* Slightly shake other moving parts (wheel bearing).

Note: Replace with a new part when wiring harness is broken for high tension, especially for a temporary sensor short or

open causing by suspension system moving up and down when vehicle operating, therefore a vehicle drive test is must

when check sensor signal.

Ⅱ.When overheat or overcold is the main possible causes:

* Dry suspected part with a drier;

* Check if there is a cold welding condition using cold spraying agent.

Ⅲ. When over circuit contact resistance is the main possible cause:

* Turn on all accessories including headlight and rear defrost switch.

If the problem does not occur again, diagnose it till the problem occurs next time. In most cases, intermittent fault will be

worse and will not get better.

5. MK20-I/E SYSTEM

5.1 Checking ABS warning light

Check if ABS warning light is as following:

Ⅰ.When ignition turned ON, ABS goes on for about 1.7 senconds，then goes off。

Ⅱ. If ABS warning light is not as specified, a problem is indicated and the fault code must be retrived.

Ⅲ. If ABS warning light does not go on after igniton turned on, repair problem referring to FAULT W/O CODE

DIAGNOSTIC CHART.

5.2 Reading condition information

After turning on scan tool, enter 03 at ADDRESS, press Q , following data will be displayed：

1.Example，ECU No. and Version No.

1JO 907 379P ABS MK20I/E

2. Code (Codierung) ：×××××

3. Factory code (WSC) ：×××××

5.3 Retriving Fault Code

Enter 02 at FUNCTION SELECT, press Q, fault number will be displayed. Then press “→”, fault code

and related information of each fault will be listed.

5.4 Clearing Fault Code

Enter 05 at FUNCTION SELECT, press Q, fault code will be cleared. If failed to clear the code, the fault is a hard

fault. If stored code can be cleared, it indicates an intermittent fault, which can be detected only during a vehicle drive

test.

5.5 Fault Code Display Method

System Problem

Displayed Code

Never happened before

No fault code

No problem so far

(ABS warning light is off)

Happened sometime before

Intermittent code

Never happened before

Not intermittent code

Still exist so far

(ABS warning light is on)

Happened sometime before

Intermittent code AND

Not intermittent code

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

6. Hydraulic Controlled Unit Diagnostic

6.1 Hydraulic controlled unit can be diagnosed using scan tool. Follow below
procedures after entering 03.

Step Action

Taken

Data

Displayed

Resullt Under Normal

Condition

Hydraulish ABS Pumpe V64

(Hydraulic pump test)

Bremse Bestatigung

(Depress brake pedal)

EVL:0V AVL：0V Rad blockiert

(Normal Open Valve：0V

Normal Closed Valve： 0V Wheel Block?)

Wheel Block

EVL：UBAT AVL：0V Rad blockiert

(Normal Open Valve：POWER ON

Normal Closed Valve：0V Wheel Block?)

Wheel Block

EVL：UBAT AVL：UBAT Rad frei

(Normal Open Valve：POWER ON

Normal Closed Valve：POWER ON Wheel can spin

freely)

Wheel can spin freely;

pedal kick back; pump

motor running sound can

be heard.

EVL：UBAT AVL：0V Rad frei

(Normal Open Valve：POWER ON

Normal Closed Valve：0V Wheel can spin freely)

Wheel

can

spin

freely;

Depress Brake Pedal

And Keep Depressed

EVL：0V AVL：0V Rad blockiert

(Normal Open Valve：0V

Normal Closed Valve：0V Wheel block?)

Wheel Block,

Pedal descent silghtly

Realse Brake Pedal

Bremwd losen (Release Brake Pedal)

6.2 Perform above test procedures on each wheel.
Sequences : LF→RF→LR→RR.

7. Quick Fault Repairing Index

7.1 Fault w/code check chart index

Code

Fault description

Diagnosing object

Check chart No.

Page No.

65535

Electronic controlled unit

Defective

P.29

01276

ABS Hydraulic pump

Inoperative motor

P.12

00283

LF Wheel Speed Sensor

00285

RF Wheel Speed Sensor

00290

LR Wheel Speed Sensor

00287

RR Wheel Speed Sensor

Electrical and

mechanical problem

2，3，4 P.13，P.14，P.15

01044

ABS wrong programing

P.16

00688

Voltage supply terminal 30

P.17

01130

ABS abnormal operating

Unreasonable signal

P.18

7.2 Fault w/o code check chart index

Problem Sympton

Check chart No.

Page No.

Igniton turned to ON position (engine off), ABS warning light is off

P.19

After engine running, ABS warning light does not go off.

P.20

Uneven two sides’ brake force

Insufficient brake force

ABS operate when slightly depress brake pedal

(Vehicle is stationary)

ABS operate when slightly depress brake pedal

(Vehicle is operating)

Abornal

ABS operating

Brake pedal vibrate heavily when ABS operating

3 P.21

Brake pedal travel too long

P.22

Brake pedal depressing need a great force.

P.23

No fault code output (does not communicate with scan tool).

P.24

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

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