Which outcome occurs when the fuel injector transistor in an engine control unit (ECU) shorts closed?

💡 Explanation

When the fuel injector transistor shorts closed, continuous current flows to the fuel injector because the control signal is bypassed, causing it to remain open regardless of ECU commands, resulting in a continuous fuel injection and rich combustion condition. Therefore overly rich combustion happens, rather than misfires, overheating, or fuel pump shutoff all of which require different electronic system faults.

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