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 PCM 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 idle speed is 100RPM below desired idle speed, PCM sets P0506. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till cosecutive 2 driving cycle.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Determines if a low idle condition exists. | ● Poor connection ● Intake/Exhaust system for blockage ● Throttle plate for carbon deposits ● Faulty ETS motor ● Faulty TPS ● Faulty ETS system ● Faulty PCM |
Enable Conditions | ● Normal Idle conditions ● Canister Purge Fuel Flow ≤ 100 ● Barometric Pressure > 72kPa ● Engine running ≥ 2 sec. ● Air Intake Temperature ≥ -20℃ (-4℉) ● Coolant Temperature ≥ 0℃ (32℉) ● 11V ≤ Ignition Voltage ≤ 16V ● Above conditions met period > 3 sec. | |
Threshold value | ● Real engine speed - Target engine speed< -100rpm | |
Diagnosis Time | ● Continuous | |
MIL On Condition | ● 2 driving cycles |
