The idle speed is controlled by the Electrical Throttle Control(ETC) System. ETC system is composed of the throttle motor to operate the throttle valve and the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position and the one valve type throttle body. The ECM controls the throttle motor to provide the proper throttle valve opening angle for the target idle speed.
Checking idle RPM under detecting condition, if if the real idle speed is lower than desired idle speed by 100 RPM over 10 sec., ECM sets P0506. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item
Detecting Condition
Possible cause
DTC Strategy
Monitor idle speed
Intake system for blockage
Enable Conditions
Normal idle conditions
Threshold value
Real engine speed is lower than target engine speed by 100 RPM
Diagnosis Time
Continuous
MIL On Condition
2 driving cycles
Fig.1) Normal data of Engine RPM after engine warmed up.