P0506 Idle Air Control System-RPM Lower than Expected - Automotive Repair Guides & Equipment

GENERAL DESCRIPTION

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.

DTC DESCRIPTION

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.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Monitor idle speed

1.	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

3 driving cycles

SIGNAL WAVEFORM & DATA

Fig.1) Normal data of Engine RPM after engine warmed up.

MONITOR GDS DATA

1.	Monitor DTCs related to HO2S, MAFS, MAPS, ECTS, PCSV, Injector, CVVT items, ETC system, A/C system, or power steering system with GDS.

Are there the DTCs above-mentioned?

	▶ Do all repairs associated with those codes before proceeding with this procedure.
	▶ Go to “System Inspection” procedure.

SYSTEM INSPECTION

■ Check intake system for blockage

1.	Visually/physically inspect the following items: ▶ Air cleaner filter element for excessive dirt or for any foreign objects ▶ Hoses of intake system for blockage ▶ Throttle body inlet for damage or for any foreign objects ▶ Throttle plate for carbon deposits

Has a problem been found in any of the above areas?

	▶ Repair as necessary and go to “Verification of Vehicle Repair” procedure
	▶ Clear DTC and Test-drive under enable conditions above-mentioned. After the test, If this DTC is set, go to “Inspection & Repair” procedure. If not, troubleshooting is completed.

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