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.
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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
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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
01
Hydraulish ABS Pumpe V64
(Hydraulic pump test)
02
Bremse Bestatigung
(Depress brake pedal)
03
EVL:0V AVL:0V Rad blockiert
(Normal Open Valve:0V
Normal Closed Valve: 0V Wheel Block?)
Wheel Block
04
EVL:UBAT AVL:0V Rad blockiert
(Normal Open Valve:POWER ON
Normal Closed Valve:0V Wheel Block?)
Wheel Block
05
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.
06
EVL:UBAT AVL:0V Rad frei
(Normal Open Valve:POWER ON
Normal Closed Valve:0V Wheel can spin freely)
Wheel
can
spin
freely;
07
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
08
Realse Brake Pedal
Bremwd losen (Release Brake Pedal)
6.2 Perform above test procedures on each wheel.
Sequences : LF→RF→LR→RR.
6
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
1
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
5
P.16
00688
Voltage supply terminal 30
6
P.17
01130
ABS abnormal operating
Unreasonable signal
7
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
1
P.19
After engine running, ABS warning light does not go off.
2
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
4
P.22
Brake pedal depressing need a great force.
5
P.23
No fault code output (does not communicate with scan tool).
6
P.24
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Chery SQR7160 series sedan ABS system-fault diagnostic and repairing
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