Chrysler Crossfire. Manual — part 531
(P0174) FUEL SYSTEM 2/1 UNDERCORRECTION OF FUEL MIXTURE (OFF IDLE) (CONTINUED)
When Monitored and Set Condition
•
When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -7°C
(20°F), altitude below 2590m (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, the MIL illuminates and a trouble code is stored.
POSSIBLE CAUSES
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
O2 SENSOR SIGNAL CIRCUIT
O2 SENSOR GROUND CIRCUIT
O2 SENSOR HEATER OPERATION
MANIFOLD ABSOLUTE PRESSURE SENSOR OPERATION
ENGINE COOLANT TEMPERATURE SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
O2 SENSOR
FUEL PUMP
FUEL CONTAMINATION/EXHAUST LEAK
For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
CHECK FOR CURRENT DTC
Turn the ignition on.
With the DRB III
T
, read PCM DTCs.
Is this DTC present?
Yes
>> For complete diagnosis of this DTC, refer to (P0172)
FUEL SYSTEM 1/1 LEAN CONTROL BELOW LIMIT (AT
LOAD).
No
>> Go To 2
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ENGINE - ELECTRICAL DIAGNOSTICS
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(P0174) FUEL SYSTEM 2/1 UNDERCORRECTION OF FUEL MIXTURE (OFF IDLE) (CONTINUED)
2.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Note: Check connectors — Clean/repair as necessary. Poor pin to terminal connections can set DTCs. Using
the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the
wires while checking for shorts and open circuits.
Note: Check for any Technical Service Bulletins that may apply.
Were there any problems found?
Yes
>> Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST - VER 2.
No
>> The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for
a possible intermittent condition.
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ENGINE - ELECTRICAL DIAGNOSTICS
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(P0175) FUEL SYSTEM 2/1 OVERCORRECTION OF FUEL MIXTURE (OFF IDLE)
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ENGINE - ELECTRICAL DIAGNOSTICS
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(P0175) FUEL SYSTEM 2/1 OVERCORRECTION OF FUEL MIXTURE (OFF IDLE) (CONTINUED)
When Monitored and Set Condition
•
When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -7°C
(20°F), altitude below 2590m (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, the MIL illuminates and a trouble code is stored.
POSSIBLE CAUSES
EVAP PURGE SOLENOID OPERATION
O2 SIGNAL CIRCUIT
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
O2 SENSOR GROUND CIRCUIT
MANIFOLD ABSOLUTE PRESSURE SENSOR OPERATION
ENGINE COOLANT TEMPERATURE SENSOR OPERATION
O2 SENSOR
ENGINE MECHANICAL PROBLEM
FUEL FILTER/PRESSURE REGULATOR
POWERTRAIN CONTROL MODULE
For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
CHECK FOR CURRENT DTC
Turn the ignition on.
With the DRB III
T
, read PCM DTCs.
Is this DTC present?
Yes
>> For complete diagnosis of this DTC, refer to (P0171)
FUEL SYSTEM 1/1 RICH CONTROL OVER LIMIT (AT
LOAD).
No
>> Go To 2
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ENGINE - ELECTRICAL DIAGNOSTICS
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