DTC    P0401    Exhaust Gas Recirculation Flow Insufficient Detected

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

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 (INTAKE PORT TO EGR VALVE ASSEMBLY)

CHECK FOR DEPOSIT (EXHAUST MANIFOLD SUB-ASSEMBLY TO EGR VALVE ASSEMBLY)

INSPECT EGR WITH COOLER PIPE SUB-ASSEMBLY

READ VALUE USING INTELLIGENT TESTER (MANIFOLD ABSOLUTE PRESSURE SENSOR)

CHECK INTAKE SYSTEM

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED