Toyota Etios & Liva has immobilizer in its cars which works as theft deterrent. It stores its codes in special 8 leg EEPROM IC 93C66. We got a special case where one connection on circuit to IC was missing.

On close inspection, we found that this connection sends the signal to processor via the path shown below.

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We connected the wire from processor using solder iron which later is connected to EEPROM IC. This arrangement resulted in successful starting of the car.

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