Common 2007 Suzuki Swift ECU symptoms:
• Crank but no start: Engine spins over but won't fire (no spark or fuel).
• Random stalling: Engine cuts out or misfires while driving.
• Auto transmission bugs: Harsh shifts, delayed gears, or limp mode.
• No scanner connection: OBD-II reader throws a "No Communication" error.
• Water damage: Rain or wash water leaks into the casing, corroding the board.