Fuel Injection System (RENIX/AMC) - TBI: Description
The Renix/AMC throttle body fuel injection system (TBI) uses an electronically controlled fuel injector to inject a metered spray of fuel above the throttle blade in the throttle body.
The TBI system is comprised of 2 sub-systems: the Fuel System and the Control System. Major components of the fuel system include an in-tank electric fuel pump, fuel filter, pressure regulator and a fuel injector.
The control system consists of an electronic control unit (ECU), several sensors and other engine components. The inputs through the sensors represent the engine's instantaneous operating conditions. Based on the inputs, the ECU generates outputs that change the air/fuel mixture ratio and ignition timing as necessary to optimize the performance of the engine. The ECU also has controlling functions involving fuel delivery, idle speed, and emission control.
Input components of the control system include the air conditioning "ON" switch, manifold air/fuel mixture temperature (MAF) sensor, coolant temperature (CTS) sensor, manifold absolute pressure (MAP) sensor, wide open throttle (WOT) switch, closed throttle (idle) switch, oxygen (O2) sensor, ECU, engine speed and crankshaft position (crankshaft) sensor, gear position (P/N auto trans. only), and a knock sensor.
Outputs from the ECU include control of the fuel pump, fuel injector, upshift indicator (man. trans. only), ignition control module, A/C compressor clutch, and an idle speed actuator (ISA) and motor assembly. See Figure .