DTC    P0171    System Too Lean (Bank 1)

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174 OR P0175)

CHECK CONNECTION OF PCV HOSE

CHECK AIR INDUCTION SYSTEM

PERFORM ACTIVE TEST (A/F CONTROL)

READ DATA LIST (ENGINE COOLANT TEMPERATURE)

READ DATA LIST (MASS AIR FLOW METER)

CHECK FUEL PRESSURE

CHECK FOR EXHAUST GAS LEAKAGE

CHECK FOR SPARK AND IGNITION

INSPECT FUEL INJECTOR

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

INSPECT RELAY (Marking: A/F)

CHECK WIRE HARNESS (A/F SENSOR - ECM)

REPLACE HEATED OXYGEN SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174 OR P0175)