P0506

DTC P0506 Idle Control System - rpm Lower Than Expected

Component Location:

DESCRIPTION

The Idle Speed Control Actuator (ISCA) is installed on the intake manifold and controls the intake airflow that is bypassed around the throttle plate to keep constant engine speed when the throttle valve is closed. The function of the ISCA is to maintain idle speed according to various engine loads and conditions, and also to provide additional air during starting. The ISCA consists of an opening coil, a closing coil, and a permanent magnet. Based on information from various sensors, the ECM controls both coils by grounding their control circuits. According to the control signals from the ECM, the valve rotor rotates to control the by pass airflow into the engine.

Detecting Condition & Limp Home:

DTC DETECTING CONDITION

1. DTC Description
The ECM monitors engine speed deviation from the target idle engine speed when the vehicle is stopped and the idle speed valve opening is stable. The ECM sets DTC P0506 if the difference to the target idle engine speed is lower than the predetermined threshold. If the same error code is set in the next driving cycle, the ECM illuminates the MIL.

2. Conditions for Setting the DTC

Specification - TPS:

Specification - ISCA Coil #1 (Open):

Specification - ISCA Coil #2 (Close):

Schematic Diagram:

Signal Wave Form:

Step 1 - 4:

Step 5 - 7:

Inspection Procedure