Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0506: Idle Air Control System-RPM Lower than Expected: 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.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.