TIAGO TIGOR CNG - SERVICE MANUAL

BRAKES 56 20.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 its 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 should 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.