- fuel tank;
- electric fuel pump (mounted inside the tank);
- injection system main relay and fuel pump relay;
- nozzles;
- fuel pressure control;
- air filter;
- throttle body.
Cars 1988-92 with 3F-E engine equipped with electronic fuel injection (EFI system).
Vehicles since 1993 with the 1FZ-FE engine are equipped with an improved direct injection system. The injection system on later models features slight changes to the pressure regulation and air flow control systems.
Electronic fuel injection system
In a direct injection system, fuel is injected into each cylinder through injectors. The injection system is controlled by the processor unit (ECM), which sets the duration of the pulses (amount of fuel) in response to beeps from various engine sensors. The amount of air in the combustible mixture is set by the throttle valve. Fuel pressure is regulated by a vacuum control valve (VSV valve). On a warm engine, the valve reduces fuel pressure at start-up and leans the mixture. On later models, the VSV valve is controlled by a processor unit, on early models - by a special system for monitoring the start of a warm engine (High Temperature Line-Up Pressure System).
Fuel pump and lines
Fuel circulation is provided by an electric pump through a pair of steel tubes. The return of the evaporated fuel to the tank is provided by a trapping system through a separate tube. The pump is activated when reference pulses are received from the ignition unit to the processor unit. In the absence of these pulses, the pump turns off after 2-3 seconds.
Exhaust system
The system additionally includes an oxygen sensor and a 3-way converter, which belongs to the exhaust gas purification system and is installed in the exhaust pipe in order to reduce the toxicity of emissions.