Chery A15. Manual - part 83

*   ECU coding

The new ECUs shall be coded when replacing the HECUs or ECUs, otherwise the ABS
warning lamp will flash and the system fails to operate normally.

The original diagnostic tester is available to code the ECUs, the procedure of which is as
follows:

Connect the diagnostic tester with the

diagnostic socket

Select [Universal OBD-16] diagnostic

connection

Select the “Control Unit Coding” from the

function items

“Please input new coding _ _ _ _ _” displayed on the

screen

Press “OK” button, and then display as

follows

1J0907379   P ABS       20  IE  CAN

001

Coding:  01901

WSC:  000001

The coding finish and exit

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Fluid Refilling and Air Bleeding

*   Wet type HCU

If the spare part is a wet type HCU, it is required to only refill the fluid and bleed the air in
accordance with the method available to the general brake system after replacing the HCU.

*   Dry type HECU

If the spare part is a dry type HCU, apart from refilling the fluid and bleeding the air in
accordance with the method available to the general brake system, it is also required to
bleed the air of HECU’s second circuit after replacing the HCU.

*   DTC display mode

System problem display code

Display code

No DTC

Never 

occur 

before 

No 

DTC

No problem current
(ABS warning lamp NOT
light)

Occur before

Random DTC

Never 

occur 

before 

Non-random 

DTC

Problem still exist
(ABS warning lamp lights)

Occur before

Random and non-random
DTCs

TROUBLESHOOTING QUICK INDEXING TABLE
DTC Failure Check Sheet Index

Diagnostic Code 

Description of Failure

Diagnostic Details

65535

Electronic Control Unit (ECU)

Damaged

01276

ABS hydraulic pump

Motor fails to operate

00283

Front left wheel sensor

00285

Front right wheel sensor

00290

Rear left wheel sensor

00287

Rear right wheel sensor

Electrical and mechanical
failures

01044

ABS coding error

00668

Supply terminal 30

01130

Abnormal 

ABS 

operation 

Unreasonable 

signal

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CAUTION WHEN FAILURE DIAGNOSING
The ABS adopts the electronic hydraulic control, so it is normal that the phenomena listed
in the table below occur under the normal operation of the ABS system, which shows they
aren't the failures.

Phenomena

Description

System self-check

sound

Sometimes, the sounds like the knock sound come from
the engine compartment after the engine starts, which is
the sound from the ABS self-check and doesn't indicate
it is abnormal.

Sound while the ABS

operates

1. Sound from the motor inside the ABS hydraulic unit.
2. Sound generated together with the brake pedal
vibration.
3. The suspension knocking sounds created due to
braking or the Creak sounds generated due to the
contact of tire with the ground when the ABS operates.

CAUTION: The tire may still give out the “Creak”

sound when the ABS operates normally.

ABS operates but long

brake distance

The braking distance of the vehicle with ABS is longer
than that of vehicle without ABS when the vehicle
travels on a snow or sand-gravel road, and thus a driver
shall be reminded to pay more attention to the road
condition when driving on the road above.

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Repair Details of Random Failure:

In the electronic control system, the instantaneous and poor contact problem may occur in such
positions as the electrical circuit and input/output signal passage. Thus it causes the random failure
or generates the DTC when ECU self-checking. If the reason of failure still exists, the abnormal
parts can be found only in accordance with the DTC Failure Check Sheet, but sometimes the reason
to cause the failure will disappear automatically, so it is difficult to find out the reason of problem.

In this case, simulate the failure and check whether it reoccurs in accordance with the following
methods.

When the major reason may be vibration:

*   Slightly swing the connection up and down;

*   Slightly swing the harness up and down, left and right;

*   Slightly swing the sensor up and down, left and right;

*   Slightly swing the other motion parts such as wheel bearing.

Caution: If the harness is twisted off or pulled tightly and then broken, it is necessary to

replace it with a new one, especially it may cause the transient open/short circuit of
sensor due to the up and down movement of suspension system when the vehicle is
traveling. Thus the actual vehicle test must be conducted when checking the signals
from the sensor.

When the major reason may be over hot or super-cold:

*   Use a blower to heat the parts that you think it may be failed.

*   Use the cold spraying agent to check the cold welding phenomenon.

When the major reason may be the over-high contact resistance in the power supply circuit.

*   Turn on all electrical switches, including the headlamp and rear defroster switches.

If the failure doesn’t reoccur here, it may be diagnosed and repaired only when the failure occurs at
next time. The random failure will generally become worse only, and is difficult to get better.

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