Chrysler 300M 2002 Service Manual page 2537

DRIVEABILITY - NGC
P0171-FUEL SYSTEM 1/1 LEAN —
TEST
12 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the O2 Sensor Signal Return circuit in the O2 Sensor harness
connector.
Is the voltage at 2.5 volts?
Yes → Test Complete.
→ Check the O2 Sensor Return circuit for a short to ground, open, or
No
13 Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special 5/16 fuel line adapter tool #6539 between disconnected fuel line and
the fuel pump module.
Attach a fuel pressure test gauge to the T fitting on tool #6539.
Ignition on, engine not running.
With the DRBIII , actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 339 KPa +/- 34 KPa (49 psi +/- 5 psi).
Is the fuel pressure within specification?
Yes → Repair or replace fuel supply line as necessary.
→ Go To 14
No
Caution: Stop All Actuations.
14 Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose,fitting or line, the fuel
system pressure must be released.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
Is the Fuel Inlet Strainer plugged?
Yes → Replace the Fuel Pump Inlet Strainer.
→ Go To 15
No
15 If there are no possible causes remaining, view repair.
Repair
ACTION
shart to voltaage. Inspect the O2 Sensor connector and the PCM
harness connector. If OK, replace and program the Powertriain
Control Module in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the Fuel Pump Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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