DTC    P0171    System Too Lean (Bank 1)

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK PCV HOSE

CHECK AIR INDUCTION SYSTEM

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Control the Injection Volume for A/F Sensor)

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

READ VALUE USING INTELLIGENT TESTER (MAF)

CHECK FUEL PRESSURE (LOW PRESSURE)

CHECK FUEL PRESSURE SENSOR

CHECK FUEL PRESSURE (HIGH PRESSURE)

CHECK FOR EXHAUST GAS LEAKAGE

CHECK FOR SPARKS AND IGNITION

INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

INSPECT A/F HTR RELAY

CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

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