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P0171-FUEL SYSTEM 1/1 LEAN (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation The fuel feedback system will maintain a stoiciometric fuel/air mixture, 14.7:1, by modifying the injector pulsewidth • When Monitored: • Set Condition: Possible Causes RESTRICTED FUEL SUPPLY LINE FUEL PUMP INLET STRAINER PLUGGED FUEL PUMP MODULE O2 SIGNAL CIRCUIT O2 RETURN CIRCUIT O2 SENSOR HEATER OPERATION O2 SENSOR MAP SENSOR OPERATION ECT SENSOR OPERATION ENGINE MECHANICAL FUEL FILTER/PRESSURE REGULATOR (HIGH) PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Diagnose all other trouble codes before continuing. NOTE: Check for contaminants that may have damaged an O2 Sensor: contaminated fuel, unapproved sil- With a scan tool, read DTCs. Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 224 ENGINE ELECTRICAL DIAGNOSTICS WK |