NEXON

BRAKES

1.13.9. REMOVAL AND REFITMENT OF ABS

ECU / HCU

Following precautions should be carried while

working on ABS.

1) Before undertaking any electric arc welding

work, disconnect the ABS ECU’s connector.

2) During paintwork operations or major repair

work, which are likely to subjected to higher

temperature (above 85° C), The HCU must be

removed.

3) Before removing the ECU, the battery must be

disconnected.

4) Terminals must be fully tightened while

installing battery.

5) Electrical wiring not to be repaired (should be

replaced)

REMOVAL

1) Turn OFF the ignition switch and disconnect

battery.

2) Disconnect ABS ECU wiring harness

connector.

NOTE:

Refer steps (i) and (ii) to disconnect ABS ECU

Connector.

(i) Press the unlock button and remove the lever

from the lock and move towards unlocking

position.

(ii) Lock the lever to it is unlock position by

pressing the lever till the Click sound is heard and

remove the connector from ABS ECU.

WARNING:

Never apply a 12V power source to any

terminal of the ECU connector when it’s

disconnected.

3) Identify the brake pipes going into and out of

the Hydraulic Control Unit (HCU) with tags so

that reinstallation of the brake lines becomes

easy.

NOTE:

Proper care must be taken before removing

the brake pipes from HCU; the HCU must be

thoroughly cleaned to prevent dirt particles

from falling into the ports of HCU or entering

the brake pipes.

4) Remove the brake pipes from the HCU and

plug the HCU ports with suitable grommet.

5) Remove the bolts attaching ECU to the

mounting bracket and take out the ECU from

bracket.

NOTE:

ABS ECU is not serviceable.

INSTALLATION

1. Put the grommets and the mounting studs at

appropriate places.

2. Align the bottom ECU grommet to the dowel in

mounting bracket and insert ECU so that both

the mounting studs get aligned

3. Tighten the bolts to the ECU stud with

mounting bracket to specified torque. (1.0

Kgm)

4. Reconnect brake lines. Be certain that the

brake lines have been connected to the correct

ports to ensure proper ABS operation. Tighten

the coupling nut to specified torque. (1.4 - 1.6

Kgm)

5. Connect the ECU harness connector.

6. Bleed the brake system.

7. Clear all fault code memories.

8. Road test vehicle to ensure proper operation of

the base and ABS systems