Passport EX 4WD V6-3165cc 3.2L DOHC MFI (2001)
Fuel Pump Electrical Circuit
Fuel Pump Electrical Circuit
When the key is first turned "ON," the PCM energizes the fuel pump relay for two seconds to build up the fuel pressure quickly. If the engine is not
started within two seconds, the PCM shuts the fuel pump off and waits until the engine is cranked. When the engine is cranked and the 58X crankshaft
position signal has been detected by the PCM, the PCM supplies 12 volts to the fuel pump relay to energize the electric in-tank fuel pump.
An inoperative fuel pump will cause a "no-start" condition. A fuel pump which does not provide enough pressure will result in poor performance.
Fuel Rail
Fuel Rail
The fuel rail is mounted to the top of the engine and distributes fuel to the individual injectors. Fuel is delivered to the fuel inlet tube of the fuel rail by
the fuel lines. The fuel goes through the fuel rail to the fuel pressure regulator. The fuel pressure regulator maintains a constant fuel pressure at the
injectors. Remaining fuel is then returned to the fuel tank.
Throttle Body Unit
Throttle Body Unit
The throttle body has a throttle plate to control the amount of air delivered to the engine. The TP sensor are also mounted on the throttle body. Vacuum
ports located behind the throttle plate provide the vacuum signals needed by various components.
Engine coolant is directed through a coolant cavity in the throttle body to warm the throttle valve and to prevent icing.