* Throttle Position Sensor (TPS): This sensor measures the throttle plate's position and sends a signal to the engine control unit (ECU). This is crucial for determining fuel delivery and ignition timing.
* Idle Air Control Valve (IACV) or Idle Speed Control (ISC) valve: This valve controls the amount of air bypassing the throttle plate at idle, allowing the ECU to maintain a consistent idle speed.
* Fuel Injectors: These are electronically controlled valves that inject fuel into the intake manifold. The ECU controls the duration of their opening (pulse width) to determine the amount of fuel injected.
* Airflow Sensor (MAF or MAP): While not directly *on* the throttle body, the Mass Airflow Sensor (MAF) or Manifold Absolute Pressure sensor (MAP) is essential for the TBFI system. It measures the amount of air entering the engine, allowing the ECU to precisely calculate the required fuel. (MAF is more common in TBFI systems)
* Wiring harness: This connects all the components to the ECU.
So, while the throttle body itself is a mechanical component, its function within a fuel injection system is entirely dependent on these associated electrical components.
