Fuel Supply System
Fuel Supply System
The fuel supply system consists of the fuel tank, injectors, Fuel Tank Pressure (FTP) sensor, Fuel Tank Temperature (FTT) sensor, fuel pressure sensor, fuel temperature sensor, injector control module, injector relay, fuel pressure regulator shut-off solenoid valve, fuel tank internal solenoid valve, fuel pressure regulator P1, fuel pressure regulator P2, fuel pressure regulator switch, fuel filters, and manual shut-off valve.
Fuel Cut-off Control
During deceleration with the throttle valve closed, current to the injectors is cut off to improve fuel economy at speeds over 950 rpm. Fuel cut-off action also occurs when engine speed exceeds 6,600 rpm, regardless of the position of the throttle valve, to protect the engine from over-revving.
When the vehicle is stopped, the PCM cuts the fuel at engine speeds over 5,000 rpm.
Fuel Filter
The fuel filters prevent contamination in the fuel from getting into the engine.
Fuel Pressure sensor
The fuel pressure sensor is located on the fuel pressure regulator P2 and it detects fuel pressure to the injectors. The signal is used to correct the fuel injection period by monitoring fuel pressure. It also detects any abnormality in the fuel pressure.
Fuel Pressure Regulator P1
The fuel pressure regulator P1 lowers pressure of fuel from the fuel tank and sends it to fuel pressure regulator P2.
Fuel Pressure Regulator P2
The fuel pressure regulator P2 lowers the pressure of fuel from fuel pressure regulator P1 and sends it to the injectors.
Fuel Pressure Regulator Shut-off Solenoid Valve/Fuel Tank Internal Solenoid Valve
The fuel tank internal solenoid valve is located in the fuel tank, it turns ON or OFF to supply the fuel to the engine.
The fuel pressure regulator shut-off solenoid valve is located on the fuel pressure regulator P1, and it turns ON or OFF to supply fuel to the engine.
When the ignition switch is turned ON (II), the fuel tank internal solenoid valve and the fuel pressure regulator shut-off solenoid valve normally open for two seconds.
Fuel Pressure Regulator Switch
The fuel pressure regulator switch is located on the fuel pressure regulator P1. It detects fuel pressure malfunction.
Fuel Tank
The fuel tank is made of carbon fiber and fiber glass reinforced plastic. The fuel capacity is 26.4 US gal. (100 l, 22.0 Imp gal.) at 3,600 psi (24,800 kPa).
Fuel Tank Temperature (FTT) Sensor
The FTT sensor is on the fuel joint block. It detects the temperature of the fuel, and this signal is used to calculate the amount of fuel in the fuel tank.
Fuel Tank Pressure (FTP) Sensor
The FTP sensor is located on the fuel joint block and it detects fuel tank pressure. The signal is used to calculate the amount of fuel in the fuel tank and to detect any leakage.
Fuel Temperature Sensor
The fuel temperature sensor is on the fuel rail. Detects the temperature of the fuel. Its signal is used to correct the fuel injection period according to fuel temperature.
Fuel Vent Duct
The fuel lines are enclosed in a duct that contains any escaped fuel in case there is a leak in the fill pipe. The fuel is rerouted to the fuel fill compartment to prevent it from leaking into the trunk or passenger compartment.
Injector Control Module
The injector control module controls the injectors, and prevents them from sticking when starting in extremely low temperatures. Current is increased to the injectors momentarily, when the ignition switch is turned ON (II), to loosen any sticking injectors.
Manual Shut-off Solenoid Valve
The manual shut-off valve is located under floor in the left rear. This valve can be turned manually to cut the fuel supplied to the engine.
Low Fuel indicator light
The low fuel indicator light turns on when the fuel level is low. It blinks when a problem is detected with the Fuel Tank Pressure (FTP) sensor, Fuel Tank Temperature (FTT) sensor, or fuel pressure regulator switch.
PGM-FI Main Relay 1 and 2
The PGM-FI relay consists of two separate relays. PGM-FI main relay 1 is energized whenever the ignition switch is ON (II). It supplies battery voltage to the PCM, powers injectors, and powers PGM-FI main relay 2. PGM-FI main relay 2 is energized to supply power to the fuel pressure regulator shut-off solenoid valve/fuel tank internal solenoid valve for 2 seconds when the ignition switch is turned ON (II), and when the engine is running.