Fuel Injectors; Fuel Pump Pressure Test-2.5L Engine - Chrysler Stratus RHD 1999 Electronic Service Manual

14 - 10 FUEL SYSTEM
DIAGNOSIS AND TESTING (Continued)
FUEL PUMP PRESSURE TEST—2.5L ENGINE
WARNING: FUEL SYSTEM PRESSURE MUST BE
RELEASED BEFORE A FUEL SYSTEM HOSE OR
COMPONENT IS DISCONNECTED.
The fuel system operates at approximately 338 kPa
(49 2 psi).
(1) Perform fuel system pressure release procedure.
(2) Remove fuel supply hose quick connector from
the chassis line (at the engine). Refer to Quick Con-
nect Fittings in this section.
(3) Connect Fuel Pressure Gauge C-4799 to Fuel
Pressure Test Adapter 6539 (Fig. 6). Install the
adapter between fuel supply hose and chassis fuel
line assembly.
Fig. 6 Fuel Pressure Test Adapter
CAUTION: When using the ASD Fuel System Test,
the ASD relay and fuel pump relay remain energized
for 7 minutes or until the test is stopped, or until
the ignition switch is turned to the Off position.
(4) Place the ignition key in the ON position.
Using the DRB scan tool, access ASD Fuel System
Test. The ASD Fuel System Test will activate the fuel
pump and pressurize the system.
• If the gauge reading equals 338 kPa (49 2 psi)
further testing is not required. If pressure is not cor-
rect, record the pressure.
• If pressure is above specifications, check for a
kinked or restricted fuel return tube (from filter to
pump module). If the fuel return tube is not pinched
or restricted, replace the fuel pressure regulator.
• If pressure is below specifications, refer to Fuel
Pressure Below Specifications chart.
FUEL LEVEL SENSOR
This procedure tests the resistance of the level sensor
itself. It does not test the level sensor circuit. Refer to
the Wiring Diagrams for circuit identification.
The level sensor is a variable resistor. Its resis-
tance changes with the amount of fuel in the tank.
The float arm attached to the sensor moves as the
fuel level changes. To test the level sensor, connect
an ohmmeter across the sensor signal and sensor
ground terminals of the fuel pump module connector
(Fig. 7). Move the float lever over the entire range to
the positions shown in the resistance chart (Fig. 7).
Record the resistance at each end point.
Replace the level sensor if the resistance is not
within specifications, or an open circuit is
noted during the entire range inspection.
Fig. 7 Level Sensor Diagnosis

FUEL INJECTORS

For fuel injector diagnosis, refer to the Fuel Injec-
tor Diagnosis charts.
JA