Geely Diagnosis Flow. Manual part — 105

417

No.319 Large force is required to stamp the pedal

5

Large force is required to stamp the pedal

Possible cause

[Description] Inspect the stroke of the booster and the brake pedal with conventional
method. Failure of the normally open valve can be inspected with the function test of the
failure diagnosis hydraulic pressure unit.

z

There is something wrong with the
booster

z

There is something wrong with the
normally open valve

No.320 There is no diagnostic code output

6

There is no malfunction code output (communication with the failure
diagnosis instrument is unavailable)

Possible cause

[Description]

ABS ECU power return or the diagnostic line return is open

when the communication with the failure diagnosis instrument is unavailable.

z

The fuse is burnt

z

The diagnostic line is broken or the joint is

loose

z

ABS ECU is damaged

z

There is something wrong with the failure

diagnosis instrument

Diagnostic and inspect the
normally open valve with the
failure diagnosis hydraulic control
unit

Inspect the stroke of the booster
and the pedal according to the
conventional method of vehicles
without ABS

Replace HCU (hydraulic control unit)

Abnormal

Normal

418

Does there is display on the screen of
the failure diagnosis instrument

Inspect the power line, earth
wire, diagnostic wire and its
connection of the diagnostic
connector

Repair the
diagnostic
connector or
harness

Remove ABS ECU joint
Inspect if ECU relative terminal in ABS
harness (MK20I is terminal 13,
MK20I/E is terminal 7) and the
diagnostic connector (terminal 7 in the
failure diagnosis instrument) are
conductive

Is the failure diagnosis instrument
capable of communicating with MK20
ABS ECU on other vehicles

There is something wrong with the failure diagnosis
instrument
Carry out the inspection after the repair

Inspect ABS power fuse

Replace it

Repair the diagnostic connector or ABS harness

Replace ABS ECU

No

Yes

Abnormal

Normal

No

Abnormal

Yes

No

Conductive

419

No.321 ABS system inspection

Terminal

Inspection items

Ignition switch

gear

MK20 I

MK20 I/E

Standard value

Unit

Battery voltage (motor)

OFF

25 – 8

10.1 – 14.5

V

Battery voltage

(electromagnetic valve)

↑

9 – 24

↑

V

Power insulation property

↑

8 – 23

8 – 4

0.00 – 0.5

V

Earth insulation property

↑

8 – 24

↑ V

Supply voltage

ON

8 – 23

8 – 4

10.0 –14.5

V

OFF Alarm

lamp

off

Visual inspection

ON

ECU not connected

Alarm lamp on

Visual inspection

OFF Alarm

lamp

off

Visual inspection

ABS alarm lamp

ON

ECU connected

The alarm lamp lights
up, and lights off after

1.7 seconds

Visual inspection

Function of brake lamp

switch

Pedal not stampped down

ON

8 – 12

8 – 18

0.0 – 0.5

V

Function of brake lamp

switch

Pedal stampped down

ON

8 – 12

8 – 18

10.0 – 14.5

V

Diagnostic joint

OFF

Diagnostic joint K

and 13

Diagnostic joint

K and 7

0.0 – 0.5

Resistance value of left

front wheel speed sensor

OFF

11 – 4

1 – 2

1.0 – 1.3

k

420

Resistance value of right

front wheel speed sensor

OFF

18 – 3

19 – 20

1.0 – 1.3

k

Resistance value of left

rear wheel speed sensor

OFF

2 – 10

5 – 6

1.0 – 1.3

k

Resistance value of right
rear wheel speed sensor

OFF

1 – 17

22 - 23

1.0 – 1.3

k

Output voltage of left front

wheel sensor

OFF

11 – 4

1 – 2

3.4 – 14.8

mV/ Hz

Output voltage of right

front wheel sensor

OFF

18 – 3

19 – 20

3.4 – 14.8

mV/ Hz

Output voltage of left rear

wheel sensor

OFF

2 – 10

5 – 6

>12.2

mV/ Hz

Output voltage of right

rear wheel sensor

OFF

1 – 17

22 - 23

>12.2

mV/ Hz

Output voltage ratio of

sensor

Max. peak voltage Min. peak voltage

2

≦

Model identification

OFF

For example: 15 – 21 (Jetta 5V)

6 – 22(Santana 2000) The detail

refer to relative ABS electric wiring

diagram

0.0 – 1.0