Chery A15. Manual - part 217

  Chery A15 Maintenance Manual  

Chapter Five: Anti-lock Brake System 

Maintenance

 

I. Fault Diagnosis Flow Chart 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal 

                                                               

 

                                                                                Normal

 

Connect fault diagnoser with power off

Turn key switch to “ON” position

Turn on diagnoser power and select “

A15

” Series

Select “MK20-I/E ABS”

Select “Universal OBD-16 Diagnose Adapter”

Check communication

Refer to Uncoded Fault 

Checklist for diagnosis

Fault code

Incidental fault 

Constant fault 

Record fault code

Clear fault code 

Repair with reference to Incidental

Fault Repair Instruction 

Repair with reference to 

Fault/Fault Code Checklist

Clear fault code 

Turn key switch to “OFF” position and disconnect fault diagnoser 

Road test

Start 

 

  Chery A15 Maintenance Manual  

End 

 

II. Fault Diagnosis Precautions 

ABS adopts hydraulic control, and the occurrence of following phenomena under 

working condition of ABS is of normal but not fault. 

 

Phenomenon Description 

System self-checking noises 

Impact-like noises sometimes may be heard in engine 

compartment after starting engine, these are ABS 

self-checking noises and considered normal. 

ABS working noises 

1. Noise made by ABS hydraulic control unit motor 

2. Syntonic noise made by brake pedal 

3. Suspension impact noise or rattle sound of tires 

contacting road surface while ABS is working 

Note: Tires may still make rattle sounds when ABS 

is under working condition. 

ABS works with long braking distance 

 

The braking distance of vehicles with ABS sometimes 

is longer than those without ABS on road covered by 

snow or sandstone, so drivers must be extremely 

careful when driving on aforesaid road surfaces. 

 
 

III. Operation and Function Instruction of Fault Diagnoser 

（

1） Connect diagnoser to diagnose socket with power off, and then turn on 

ignition switch. 

（

2） Turn on diagnoser power and select “A15 Series”. 

（

3） Select “MK20-I/E ABS”. 

（

4） Select the proper diagnose adapter. 

（

5） Select applicable function items. 

 

 

 

  Chery A15 Maintenance Manual  

 

IV. Incidental Fault Repair Instruction 

Instantaneous poor contact may sometimes occur to electrical circuits and 

input/output signals in electronic control systems and cause incidental faults or 

display fault codes during self-checking of ECU. If the fault cause continues, check 

against Coded Fault Checklist to identify the abnormal part. But sometimes, fault 

causes will disappear by themselves, in which case it will be difficult to identify 

problem causes. 

Should the said case occur, imitate fault in following ways to check if the fault 

reoccurs. 

1. If vibration is the possible cause: 

. 

Slightly shake adapter vertically and horizontally. 

. 

Slightly shake wire harness vertically and horizontally. 

. 

Slightly shake sensor vertically and horizontally. 

. 

Slightly shake other moving parts such as wheel bearing. 

Note: In case wire harness is broken due to overtwist or overtension, some 

parts especially the sensor shall be replaced, for the vertical movement of 

suspension system may cause temporary open/short circuit. Therefore, a 

road test is necessary when checking sensor signal. 

2. If overheat or overcool is the possible cause: 

. 

Heat the suspect part with a blower. 

. 

Check for cold welding with cool spray. 

3. If too much power circuit contact resistance is the possible cause: 

. 

Turn on all electrical switches including head light and rear defrost switch. 

If the fault does not occur again, the diagnosis and repair will not be carried out 

until the reoccurance of the fault. Generally incidental faults will not get better 

but worse along with the time. 

 

 

  Chery A15 Maintenance Manual  

V. MK 20 Anti-lock Brake System 

(1). Checking ABS Warning Light 

Check if ABS warning light is turned on in the following order: 

1. Turn ignition switch to “ON”, and ABS warning light is turned on for about 1.7 

seconds and then goes out. 

2. If the above does not happen, check fault code for faults. 

3. If the warning light is not on at all, refer to Uncoded Fault Checklist. 

(2). Reading Status Messages 

Connect original diagnoser with the OBD-II diagnose socket at brake pedal, start the 

diagnoser and read the status messages of ABS computer. 

1. For examples, version number or part number of ABS and ECU. 

     A11-3550010 

2. Coding: 01901 

(3). Reading Fault Code 

Enter “MK20-I/E ABS” and select “Fault Code”, then press “OK”, and the fault codes 

will be displayed on the screen if any. 

(4). Clearing Fault Code 

1）  Press “Clear” key after reading fault code. 

2）  The screen will display: 

 

 

3）  Press “Yes”, and the fault code will be completely cleared if the fault is 

solved. 

(5). Display Mode of Fault Code 

Code Displayed for System Problem 

Code Displayed 

No code displayed 

Never occurred before

No code displayed 

No problems at present 

(ABS warning light off) 

Ever occurred before 

Incidental fault code displayed 

Never occurred before

Non-incidental fault code displayed 

Problem continues 

(ABS warning light on) 

Ever occurred before 

Incidental and non-incidental fault 

codes displayed 

Do you wish to clear fault code? 
[Yes]: Clear (key on, engine off)