- fuel tank;
- electric fuel pump (mounted inside the tank);
- main injection system relay and fuel pump relay;
- injectors;
- fuel pressure regulator;
- air filter;
- throttle body.
1988-92 cars with 3F-E engine are equipped with electronic fuel injection system (EFI system).
Cars from 1993 with the 1FZ-FE engine are equipped with an improved direct injection system. The injection system on later models differs in minor 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 a processor unit (ECM unit), which sets the pulse duration (amount of fuel) in response to signals 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 distribution valve (VSV valves). 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 warm engine start control system (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 evaporated fuel to the tank is provided by a catching system through a separate tube. The pump is triggered when reference pulses are received from the ignition unit to the processor unit. If these pulses are absent, the pump is switched off after 2–3 seconds.
Exhaust system
The system additionally includes an oxygen sensor and a 3-component neutralizer, which is part of the exhaust gas cleaning system and is mounted in the exhaust pipe to reduce the toxicity of emissions.