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The exhaust gas oxygen content input is not ac- cepted by the PCM during wide open throttle opera- The PCM determines the methanol content of the fuel from the methanol concentration sensor input. IGNITION SWITCH OFF MODE This is an OPEN LOOP mode. When the ignition switch is turned to the OFF position, the following • No inputs are monitored. THROTTLE BODY The throttle body houses the throttle position sen- sor (TPS) and the idle air control motor (Fig. 15). Air FUEL SUPPLY CIRCUIT Fuel is pumped to the fuel rail by an electrical pump in the fuel tank. A filter, attached to the pump The vacuum assisted fuel pressure regulator keeps fuel pressure at 380 kPa (55 psi). The regulator uses FUEL INJECTORS AND FUEL RAIL ASSEMBLY Four fuel injectors are retained in the fuel rail by lock rings (Fig. 16). The fuel injectors and rail bolt in FUEL PRESSURE REGULATOR The pressure regulator is located downstream of the fuel injector on the fuel rail (Fig. 17). The regu- The regulator has a spring loaded rubber dia- phragm that uncovers a fuel return port. When the Fig. 15 Throttle Body Fig. 16 Fuel Supply System Fig. 17 Fuel Pressure Regulator Ä FUEL SYSTEMS 14 - 65 |