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(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 • Set Condition: If the PCM multiplies short term compensation by long term adaptive and a certain percentage 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- 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 No >> Go To 2 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 269 |