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)

21

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.

22

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

23

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

24