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BRAKES
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14.9.
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.