DTC    P0171    System Too Lean (Fuel Trim)

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171 OR P0172)

CHECK PCV HOSE

CHECK AIR INDUCTION SYSTEM

PERFORM ACTIVE TEST (A/F CONTROL)

READ VALUE OF DATA LIST (COOLANT TEMP)

READ VALUE OF DATA LIST (MAF)

CHECK FUEL PRESSURE

CHECK FOR EXHAUST GAS LEAKAGE

CHECK FOR SPARK AND IGNITION

INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

INSPECT RELAY (MARKING: A/F)

CHECK WIRE HARNESS (A/F SENSOR - ECM)

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK IF DTC OUTPUT RECURS (DTC P0171 OR P0172)