Chery QQ - Fault Diagnosis Points of Attention; The Operation and the Function; Service Hints for Intermittence Malfunction

Chery QQ Service Manual Chassis System
II、Fault diagnosis Points of attention
ABS applies electronic hydraulic control system. The phenomenon in table below
is not malfunction during system normal operation.
Symptom Explain
System self diagnose sound
Knocking sound appears when engine
starts. It’s normal for system self
diagnose sound
ABS working sound
1. Sound in ABS HECU motor.
2. Pedal vibration sound
3. Sound from suspension knock or
tire touch with ground
Attention: When ABS works normally,
tire still has sound.
Brake distance is long during ABS
works
The braking distance of ABS vehicle is
longer than NON-ABS vehicle on snow or
sand road.
III、The operation and the function
（1） Connect tester and diagnosis socket when power is off, turn on ignition
switch
（2） Turn on tester power supply and select“Wind Cloud Series”
（3） Select“MK20-I/E type ABS system”
（4） Select correct diagnosis socket
（5） Select suitable function item
(For ABS circuit control please refer S11 electronics service manual)
四、Service hints for intermittence malfunction
The intermittence malfunction appears because the bad contact in circuit and
input/output signal points. Check the intermittence malfunction according to DTC
table. Sometimes the intermittence malfunction will disappear automatically. So
it’s not easy to find the problem.
Check the intermittence malfunction would appear again with following simulation.
1. If the vibration is main cause:
. Shake gently the connector left, right, up and down.
. Shake gently the harness left, right, up and down.
. Shake gently the sensor left, right, up and down.
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Chery Automobile Co., Ltd