Chrysler 300M 2002 Service Manual page 2536

P0171-FUEL SYSTEM 1/1 LEAN —
TEST
9 Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks.
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
FUEL INJECTOR - plugged or restricted injector; control wire not connected to
correct injector
Are there any engine mechanical problems?
Yes → Repair as necessary.
→ Test Complete.
No
10 Ignition on, engine not running.
Disconnect the O2 Sensor harness connector.
With the DRBIII , monitor the O2 Sensor voltage.
O2 Sensor voltage should read 5.0 volts on the DRBIII
disconnected.
Using a jumper wire, jump across the O2 Sensor harness connector from the O2
Sensor Signal circuit to the O2 Sensor Return circuit at the O2 Sensor harness
connector.
NOTE: The voltage should drop from 5.0 volts to 2.5 volts with the jumper
wire in place.
Did the O2 Sensor volts change from 5.0 volts to 2.5 volts?
Yes → Replace the O2 Sensor
→ Go To 11
No
11 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Ignition on, engine not running.
With the DRBIII , monitor the O2 Sensor voltage.
Is the voltage above 4.8 volts?
Yes → Go To 12
→ Check the O2 Sensor Signal circuit for a short to ground, open, or
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
short to voltage. Inspect the O2 Sensor connector and the PCM
harness connector. If OK, replace and program the Powertrain
Control Module in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
Continued
with the connector
107
APPLICABILITY
All
All
All