Chery A11. Manual — part 133

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

NO

Sensor installed correctly?

Reinstall sensor.

YES

Check sensor output voltage

Not normal

Check each sensor

Replace

Normal

Normal

Not normal

Repair or replace

Normal

Check ABS ECU socket and

central connector

Not normal

Normal

NO

Go to INTERMITTENT

FAULT DIAGNOSIS

YES

Repair wiring harness

or connector

No normal

Replace ABS ECU

YES

Remove ABS ECU.

Check if resistance between

following terminals is within

1.0~1.3 KOhm?

LF: 1-2

RF: 19-20

LR: 5-6

RR: 22-23

Wiggling sensor wiring harness

and connector while measuring.

Does fault appear again?

Repair connector

Check wheel bearing gap

Replace

Not normal

Check each sensor gear ring

Not normal

Normal

Perform HCU DIAGNOSTIC
using scan tool

Not normal

Replace ABS ECU

20

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

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

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

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing