Chrysler Concorde 2004 Service Manual page 770

DRIVEABILITY - NGC
Symptom List:
P0171-FUEL SYSTEM 1/1 LEAN
P0174-FUEL SYSTEM 2/1 LEAN
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0171-FUEL SYSTEM 1/1 LEAN.
When Monitored and Set Condition:
P0171-FUEL SYSTEM 1/1 LEAN
When Monitored: With the engine running in closed loop mode, the ambient/battery
temperature above (-7°C)20°F, altitude below 8500 ft and fuel level greater than 15%.
Set Condition: If the PCM multiplies short term compensation by long term adaptive and
a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates
and a trouble code is stored.
P0174-FUEL SYSTEM 2/1 LEAN
When Monitored: With the engine running in closed loop mode, the ambient/battery
temperature above (-7°C)20°F, altitude below 8500 ft and fuel level greater than 15%.
Set Condition: If the PCM multiplies short term compensation by long term adaptive and
a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates
and a trouble code is stored.
GOOD TRIP EQUAL TO ZERO
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
O2 SENSOR
O2 SIGNAL CIRCUIT
O2 RETURN CIRCUIT
O2 SENSOR HEATER OPERATION
THROTTLE POSITION SENSOR SWEEP
MAP SENSOR OPERATION
ECT SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
FUEL CONTAMINATION/EXHAUST LEAK
POSSIBLE CAUSES
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