DTC    P0401    Exhaust Gas Recirculation Flow Insufficient Detected

DESCRIPTION

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P0401)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

INSPECT EGR VALVE ASSEMBLY

REPLACE EGR VALVE ASSEMBLY

CHECK FOR DEPOSIT (EXHAUST MANIFOLD CONVERTER TO EGR VALVE)

CHECK FOR DEPOSIT (EGR VALVE TO INTAKE PORT)

READ VALUE USING INTELLIGENT TESTER (MANIFOLD ABSOLUTE PRESSURE SENSOR)

CHECK INTAKE SYSTEM

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED