Chery SQR 7160 sedan. Manual — part 8

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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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.

26

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.

27

) to each wheel cylinder. Plug ports immediately.

* Remove screw cap holding HECU on the carrier.

rrier.

trolled Unit

* Press locking buckle at connector side, and remove

on ECU.

g new screw. Tighten torque：

.

acing ECU

* Press locking buckle at connector side, and remove

rom ECU.

ew screws. Tighten torque is：

lic port cannot be

moved until brake fluid pipe is ready for installing. Avoid

install brake pipe.

torque is 12+4Nm (M10×1)

* Remove and mark brake fluid pipe (1-4

* Remove HECU assembly from ca

14.4 Replacing Hydraulic Con

pump motor wiring harness.

* Remove 4 screws shown on illustration. Removed screws

cannot be reused.

* Separate HCU and ECU.

* Install a new HCU

* Retain ECU on HCU usin

3+1Nm。

* Connect motor wiring harness. Locking buckle must be

well settled

14.5 Repl

wiring harnesss.

* Remove 4 screws shown on illustration 4 and discard.

* Remove HCU f

* Install a new ECU on HCU.

* Lock ECU on HCU using n

3+1Nm

Connect motor wiring harness and settle locking buckle well.

14.6 Installing ABS assembly

Note：Plug on ABS assembly hydrau

re

foreign material entering brake system.

* Install ABS assembly on carrier. Tighten torque is 20+4Nm

* Remove plug at hydaulic ports and

Ensure pipe connect correctly.

* Install brake pipe to master pump.

* Brake pipe mounting tighten

28