Chery QQ6 (S21) / S12LHD. Manual — part 125

Page 25 of 38

2.5 Trouble Checklist without Trouble Code

Table 1

Trouble

Evidence

The ABS warning lamp doesn’t illuminate when the engine is started

Possible Cause

● Burn of fuse
● Open-circuit of power line

● Burn of ABS warning lamp bulb
● Damage of ABS warning lamp control

Troubleshooting

Flow

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Short-circuit?

Replace bulb

Check if warning lamp
power circuit of ABS
harness and grounding
wire are disconnected

Replace

harness

Repair

connector

Yes

Is it normal?

Is it normal?

Does ABS

warning lamp

illuminate?

Is bulb

damaged?

Repair fuse socket

Replace fuse

Check and replace the
wiring of harness side
pin 16

Check and replace
warning lamp drive
component

Check warning lamp power
circuit

and

grounding

circuit connector

Check if the ABS
warning lamp bulb is
damaged?

Is fuse normal?

Is socket normal?

Check ABS warning

lamp fuse in fuse box

Check

fuse

socket of fuse
box

After the harness side connector
is removed, check for short-
circuit between the harness side
pin 16 and warning lamp drive
component

Remove

the

harness

side

connector and check the ABS
warning lamp when the entire
vehicle circuits are on.

Page 26 of 38

Table 2

Trouble
Evidence

The ABS warning lamp constantly illuminates after the vehicle start

Possible Cause

● Damage of ABS warning lamp control
● Open-circuit of ABS warning lamp control circuit
● ECU damage of ABS

Troubleshooting
Flow

Yes

Yes

No

No

Replace HECU

Check

and

replace

warning lamp drive
component

Check

and

replace

wiring of harness side
pin 16

After the harness side connector is
removed, confirm if it's powered
between the harness side pin 16 and
warning lamp drive component.

Connect the harness side pin 16 to
the grounding wire when the entire
vehicle circuits are on.

Is it powered?

Is warning lamp off?

Page 27 of 38

Table 3

Trouble

Evidence

Abnormal functioning of ABS

Possible Cause

● Damage of sensor
● Improper installation of sensor
● Problem of sensor harness
● Impurity adherence on sensor

● Damage of gear ring
● Damage of wheel bearing
● HCU damage of ABS
● ECU damage of ABS

Troubleshooting

Flow

No

No

No

No

Yes

Yes

Yes

Checking complete

Checking complete

Replace HECU or

connector

Replace sensor

Replace harness, connector or

HECU

Is problem

still present?

Is problem

still present?

Is the sensor correctly

installed?

Re-install the sensor
with correct method

Check if the ABS ECU

socket and connector

are normal

Page 28 of 38

Table 4

Trouble

Evidence

Brake pedal travel too long

Possible Cause

● Improper adjustment of handbrake
● Leakage of brake liquid
● Severe wearing of brake friction disc
● Leakage of normal close valve
● Air in the system

Troubleshooting

Flow

No

No

No

No

Is it normal?

Yes

Yes

Yes

Yes

Is it normal?

Is it normal?

Replace brake disc

Replace handbrake regulator

Replace HECU

Re-conduct the air

discharge

Air discharge checking

Check wearing of brake disc

Check handbrake regulator

Having leakage?

Tighten pipe connector to

120~160kgf.cm

Check hydraulic pipe
connector for leakage