General Information

Engine Control
P0506 Idle Air Control System-RPM Lower than Expected - General Information

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 (TPS) to detect the opening angle of the throttle valve; the Accelerator Pedal Position Sensor (APPS) detects the accelerator pedal position and a one valve type throttle body. The PCM controls the throttle motor to provide the proper throttle valve opening angle for the commanded engine rpm.

DTC Description

PCM monitors idle RPM. If actual idle speed is lower than commanded by 100 RPM for over 10 seconds, the PCM sets a P0506 DTC.

DTC Detecting Condition





Signal Waveform & Data




Fig.1) Normal data of Engine RPM at engine operating temperature.