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Chery A15. Manual - part 220

Chery A15 Maintenance Manual

8. Uncoded Fault Checklist

(1). ABS warning light is not on when ignition switch is turned to “ON” (engine off).

Possible Cause

[Description]
This may be caused by open power circuit, burned light bulb
or damaged warning light control.

Fuse burned

ABS warning light bulb burned

Power short circuit

ABS warning light control

damaged

Check ABS warning light Abnormal
fuse in central electric box Replace

Normal

Check central electric box fuse base Repair fuse base

Normal

Demount ABS ECU plug Abnormal Check ABS warning light Yes

Ignition switch: ON to see if it is burned Replace

Is warning light on?

Yes Check warning light circuit Abnormal

Check the wire connecting Abnormal and earthing circuit for open Replace wire harness
warning light control and ECU circuit in ABS wire harness
in wire harness for short circuit or earthing Normal

Yes Check warning light power Abnormal Repair adapter

Replace wire harness circuit and earthing circuit adapter

Normal Refer to Incidental Fault

Dose fault reoccur? No Repair Instruction

Yes

Replace warning light control

Abnormal

Chery A15 Maintenance Manual

(2). ABS warning light dose not go out after engine is started.

Possible Cause

[Description]
This may be caused by damaged ABS warning light
control or open ABS warning light circuit.

Warning light control damage

·ABS

warning light control circuit

open

ABS ECU damage

Note: This failure mode is limited to the situation that communication between

system and fault diagnoser is available (ABS ECU power supply is normal), and

no fault code is displayed.

Check if the circuit between ECU Yes
and ABS warning light control is open Replace wire harness

No Abnormal
Check ABS warning light control Replace

Normal

Replace ABS ECU

Chery A15 Maintenance Manual

(3). ABS Malfunction

Possible Cause

[Description]
This problem is closely related to driver and road
condition, and is difficult to diagnose. Check following
items provided there is no fault code memory.

Sensors improperly installed

Sensor wire harness defect

Sensor damage

Gear ring damage

Foreign matter adhered to sensor

Wheel bearing damage

ABS HCU (hydraulic control unit)

damage

ABS ECU (electric control unit)

damage

Install

properly

Yes

Abnormal Abnormal

Replace

Normal Normal

Abnormal

Replace

Abnormal Normal

Abnormal

Replace ABS HCU

Repair or replace

Normal

Repair adapter

Normal

Are sensors properly installed?

Check sensor output voltage

Check all sensors

Check all sensor gear rings

Check wheel bearing clearance

Check ABS ECU socket

and central adapter

Does the fault reoccur?

Refer to Incidental
Fault Repair
Instruction

Abnormal

Diagnose hydraulic control

unit with diagnoser

Chery A15 Maintenance Manual

Abnormal

Repair wire harness

or adapter

正常

更换ABS ECU

Normal

Replace ABS ECU

(4). Excessive brake pedal travel.

Possible Cause

[Description]
First visually check for exterior leakage or mechanical
failures, and check for air in system by exhaust method,
then check the normally closed valve for leakage with
hydraulic control unit test of fault diagnoser.

Brake fluid leakage

Normally closed valve leakage

Air in system

Worn-out brake disk

Improper regulation of hand brake

Abnormal

Ti Tighten connection as required

Normal Abnormal

Replace brake disk

Normal Abnormal

Replace hand brake regulator

Normal

Abnormal

Demount ABS ECU plug and
check the resistance between
following terminals.
Standard value: 1.0-1.3kΩ
Shake sensor wire harness and
adapter when measuring.
MK20I/E
Front left: 1-2; front right: 19-20
Rear left: 5-6; rear right: 22-23

Visually check hydraulic pipe connection for leakage

Check hand brake regulator

Check brake disk for worn condition

Re-exhaust

Normal

Abnormal

Replace HCU (hydraulic control valve)

Check normally closed valve for
airtightness with hydraulic control
unit diagnosis of fault diagnoser

Exhaust check

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