Chery A11. Manual — part 134

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

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

Check item

Key Igition Position

Action

Standard

Memo

Note: Vacuum must be applied to vacuum booster when performing follwing checks.

ON

Depress

pedal

When LF wheel can not

spin, pedal does not

desecent

Normally closed

valve check

LF wheel normally open

valve and normally closed

valve leakage check

ON (both valves and

pump power on

simultaneously)

Depress

pedal

When LF wheel can

spin freely, pedal does

not desecent

Normally open

valve check

ON

Depress

pedal

When RF wheel can not

spin, pedal does not

desecent

Normally closed

valve check

RF wheel normally open

valve and normally closed

valve leakage check

ON (both valves and

pump power on

simultaneously)

Depress

pedal

When RF wheel can

spin freely, pedal does

not desecent

Normally open

valve check

ON

Depress

pedal

When LR wheel can not

spin, pedal does not

desecent

Normally closed

valve check

LR wheel normally open

valve and normally closed

valve leakage check

ON (both valves and

pump power on

simultaneously)

Depress

pedal

When LR wheel can

spin freely, pedal does

not desecent

Normally open

valve check

ON

Depress

pedal

When RR wheel can

not spin, pedal does not

desecent

Normally closed

valve check

RR wheel normally open

valve and normally closed

valve leakage check

ON (both valves and

pump power on

simultaneously)

Depress

pedal

When RR wheel can

spin freely, pedal does

not desecent

Normally open

valve check

Note: This item is performed using HYDRAULIC CONTROL UNIT DIAGNOSTIC (03) on scan tool.

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Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

13.ABS Operating Check

13.1 Checking wheel speed sensor output voltage

1. Check if air gap between wheel speed sensor and gear ring is within specification.

Front wheel gap specification：see front wheel speed sensor installing illustration.

Rear wheel gap specification：see rear wheel speed sensor installing illustration.

2. Jack wheel, loosen manual brake.

3. Remove ABS wiring harness and measure at wiring harness-connecting area.

4. Spin wheel at a speed of 1/2 per second and measure output voltage using volt-hmmeter or oscilloscope.

Left Front Wheel：terminal 2-1

Right Front Wheel：terminal 19-20

Left Rear Wheel：terminal 5-6

Right Rear Wheel：terminal 22-23

Output Voltage

Using volt-ohmmeter：

Front Wheel:: see front wheel speed sensor installing illustration.

Rear Wheel:: see rear wheel speed sensor installing illustration.

Using oscilloscpe:

Front Wheel: See related specification.

Rear Wheel: See related specification.

5. If output voltage is not within the specification, check following reasons：

* Big air gap between sensor and gear ring

* Sensor problem

* Sensor resistance (1.0-1.3kΩ)

* Measure air gap between gear ring and wheel speed sensor at 4 different points (deformed gear ring).

13.2 Checking Hydraulic Contrlled Unit (HCU)

1. Lift vehicle, ensure wheel can spin freely.

2. Loosen manual brake.

3. After connecting scan tool, turn ignition to ON position. Do not start engine at this time.

4. Seeing Hydraulic Controlled Unit Diagnostic, perform check.

Note: When connect or disconnect scan tool, ignition switich must be OFF position.

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Chery SQR7160 series sedan ABS system－fault diagnostic and repairing

14. REMOVING AND INSTALLING

14.1 Spare parts supply method

* HECU (DRY)

* HCU and ECU disassembly (OIL CARRIED HCU)

14.2 Removing and Installing Precaution

* Before repairing, locate problem source using scan tool.

* Do not unpack spare parts until ready for installing.

* Only factory parts can be sued.

non-woolen wiper

sing cleaning agent without

cleaning agent。

e compressed air or move

remove ABS assembly, plug hydraulic output

d DO NOT

sealings and O ring. Oil or brake

ABS function

ck and ensure all hydraulic pipefittings do not

moving MK20-1 HECU

off, and remove battery negative lead.

edal (＞60mm) and keep depressed with pedal

* Keep cleaness when servicing, only

can be used for cleaning.

* Clean external surface u

mineral oil.

Wipe off the

* When system is on, do not us

vehicle.

* When

ports using appropriate plugs immediately.

* Remove other necessary components.

* Only DOT4 brake fluid can be used an

use mineral oil.

* Using brake fluid soak

oil grease CANNOT be used to soak them.

* Check and ensure conventional brake and

correctly.

* Che

leaking.

14.3 Re
Assembly

* Turn ignition

* Remove electrical wiring harness from ABS

assembly.

* Depress p

holder which will make master pump central valve closed

and brake fluid will not flow out when opening system.

* Remove and mark HCU brake pipe (A，B) connected to

master pump. Plug ports immediately.

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