DTC    P0171    System Too Lean (Bank 1)

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE EGR VALVE)

CHECK WHETHER DTC OUTPUT RECURS

CHECK PCV HOSE CONNECTIONS

CHECK AIR INDUCTION SYSTEM

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (INJECTION VOLUME)

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

INSPECT MANIFOLD ABSOLUTE PRESSURE SENSOR

CHECK FUEL PRESSURE

CHECK EXHAUST GAS LEAK

CHECK SPARK AND IGNITION

INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P0171 OR P0172)