1.CHECK EXHAUST GAS LEAK
 
 2.CHECK FOR INTAKE AIR LEAK
 
 3.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
 
 4.CHECK FUEL PRESSURE
 
 5. DETECT MALFUNCTIONING PART
 
 6.CHECK MASS AIR FLOW SENSOR
 
 7.CHECK FUNCTION OF FUEL INJECTOR
 
 8.CHECK FUEL INJECTOR
 
 9.CHECK INTERMITTENT INCIDENT