1.1.CHECK GROUND CONNECTION
 
 2.CHECK SECONDARY AIR INJECTION SYSTEM MAF SENSOR POWER SUPPLY CIRCUIT
 
 3.CHECK SECONDARY AIR INJECTION SYSTEM MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
 
 4.DETECT MALFUNCTIONING PART
 
 5.CHECK SECONDARY AIR INJECTION SYSTEM MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 6.DETECT MALFUNCTIONING PART
 
 7.CHECK SECONDARY AIR INJECTION SYSTEM MAF SENSOR
 
 8.CHECK INTERMITTENT INCIDENT