Chery SQR 7160 sedan. Manual - part 7

 

 

 

 

4 

Long Brake Pedal Travel 

Possible Causes 

［Note］Visually inspect if there is an external leakage or mechanical 

problem. Check if there is air in system by bleeding method. Check if 

normally closed valve exist a leakage problem using haydraulic unit function 

on scan tool.   

●brake fluid leakage 

●normally closed valve leakage 

●there is air in system 

●brake rotor heavily worn 

●manual brake misadjusted 

 

 

Visually inspect if fitting leaking. 

NOT NORMAL

Tignten fitting to specified torque. 

NORMAL

NOT NORMAL

Replace brake rotor. 

Check if brake rotor worn? 

NORMAL

NOT NORMAL

Replace manual brake adjuster unit. 

Check manual brake adjuster unit. 

NORMAL

Bleeding check 

NORMAL 

NOT NORMAL

Repeat bleeding procedures 

Check if there is a normally closed valve

leakage using HCU DIAGNOSTIC

FUNCTION on scan tool. 

NOT NORMAL Replace HCU 

  (Hydraulic Controlled Unit) 

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5 

Depressing Brake Pedel Need Strong Force 

Possible Causes 

［Note］  Check booster and brake pedal travel using conventional methods.

Normally open valve problem can be checked by hydraulic unit diagnostic 

function test on scan tool.   

●booster problem 

●normally open valve problem 

 

 
 

NORMAL

NOT NORMAL

Check normally open valve using HCU

DIAGNOSTIC function on scan tool. 

Replace HCU   

(Hydraulic controlled unit) 

Check booster and pedal travel using conventional brake methods. 

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6 

No Diagnostic Code Output (No communication with scan tool) 

Possible Causes 

［

［Note］When no communication with scan tool, it may be caused by open 

ABS ECU power and diagnostic circuit.   

● blown fuse 

●broken diagnostic cable and loose 

connector 

●defective ABS ECU 

●scan tool problem 

 

 

 

Can scan tool communicate with 

  MK 20 ABS ECU on other vehicle?

Scan tool problem. Repair it and

check again. 

Check ABS voltage supply fuse.

Replace fuse.

Is there information displayed 

on scan tool screen? 

Remove ABS ECU connector. 

Check ABS ECU terminal 13 and

diagnostic socket 

  (terminal 7 in scan tool). 

Check diagnostic socket voltage

and ground wire, diagnostic wire

and connection. Normal? 

Repair diagnostic socket   

or ABS wiring harness. 

NO

YES 

NOT  OKAY

OKAY 

NO 

NO 

Repair socket 

 Connector 

  or wiring harness. 

YES 

NO 

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12. ABS SYSTEM CHECK 

Terminal 

Check items 

Ignition 

Position 

MK201/E 

Standard Value 

Unit 

Battery Voltage (Motor) 

OFF 

25-8 

10.1-14.5 

V 

Battery Voltage (Solenoid) 

↑ 9-24 

↑ V 

Power Insulation   

↑ 8-4 

0.00-0.5 

V 

Ground Insulation   

↑ 8-24 

↑ V 

Battery Voltage 

ON 

8-4 

10.0-14.5 

V 

OFF 

Warning Light Off 

Visually 

Inspect 

ON 

ECU Not Connected 

Warning Light On 

Visually 

Inspect 

OFF 

Warning Light Off 

Visually 

Inspect 

ABS Warning Light 

ON 

ECU Connected 

Warning Light On 

about 0.7 Second 

and Then Off 

Visually 

Inspect 

Brake Light Switch Function 

Brake Pedal Not Depressed 

ON 8-18 

0.0-0.5 

V 

Brake Light Switch Function 

Brake Pedal Depressed 

ON 8-18 

10.0-14.5  V 

Diagnostic Connector 

OFF 

Diagnostic Connector 

K and 7 

0.0-0.5 

Ω 

LF Wheel Speed Sensor Resistance 

OFF 

1-2 

1.0-1.3 

kΩ 

RF Wheel Speed Sensor Resistance 

OFF 

19-20 

1.0-1.3 

kΩ 

LR Wheel Speed Sensor Resistance 

OFF 

5-6 

1.0-1.3 

kΩ 

RR Wheel Speed Sensor Resistance 

OFF 

22-23 

1.0-1.3 

kΩ 

LF Wheel Speed Sensor Output Voltage 

OFF 

1-2 

3.4-14.8 

mV/Hz 

RF Wheel Speed Sensor Output Voltage 

OFF 

19-20 

3.4-14.8 

mV/Hz 

LR Wheel Speed Sensor Output Voltage 

OFF 

5-6 

＞12.2 mV/Hz 

RR Wheel Speed Sensor Output Voltag 

OFF 

22-23 

＞12.2 mV/Hz 

Sensor Output Voltage Ratio 

High Peak Voltage 

Low Peak Voltage 

Model Identification 

OFF 

Example：12-14(Chery) SQR7160 

For more, see ABS electrical Circuit. 

0.0-1.0 

Ω 

≦2

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