Trooper S 2WD V6-3.5L (2001)
Fuel Pressure Regulator
The fuel pressure regulator is a diaphragm-operated relief valve mounted on the fuel rail with fuel pump pressure on one side and manifold pressure on
the other side. The fuel pressure regulator maintains the fuel pressure available to the injector at three times barometric pressure adjusted for engine load.
It may be serviced separate.
If the pressure is too low, poor performance and a DTC P0131, DTC P0151, DTC P0171 or DTC P1171 will be the result. If the pressure is too high,
excessive odor and/or a DTC P0132, DTC P0152, DTC P0172 will be the result. Refer to Fuel System Diagnosis for information on diagnosing fuel
pressure conditions.
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 58 X 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 Pump Relay
In order to control the FP operation, the FP relay is provided. When the starter switch is turned to "ON" position, the FP relay operates the FP for 2
seconds.
When it is turned to "START" position, the Power Train Control Module (PCM) receives the reference pulse from the Ignition Control Module and it
operates the relay, again causing the FP to feed fuel.
Fuel Rail
