1.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
 
 2.DETECT MALFUNCTIONING PART
 
 3.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 4.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
 
 5.CHECK INTERMITTENT INCIDENT