P1505 HYUNDAI, KIA: IDLE SPEED CONTROL ACTUATOR SIGNAL LOW
POST UPDATED IN May, 2023
P1505 HYUNDAI, KIA: IDLE SPEED CONTROL ACTUATOR SIGNAL LOW
The Idle Speed Control Valve (ISCA) is located on the intake manifold. Its function is to regulate the flow of intake air that is bypassed near the throttle plate to maintain a constant engine speed when the throttle valve is closed. The ISCA valve maintains the idle speed according to engine conditions and loads. Besides, it provides additional air during start-up.
The idle speed control valve design is composed of a closing coil, an opening coil, and a permanent magnet. The Engine Control Module (ECM) controls the two-coil based on information from various sensors. To do this, it grounds its control circuits, and taking into account the ECM control signals, the valve rotor turns for through-air flow control to the engine.
The P1505 OBDII fault code is set because after one minute of engine operation, the ECM detected that the idle speed control reached its air setting limit during the self-test, and the actuator signal is excessively below the allowable levels.
The reasons for storing the P1505 OBD2 diagnostic code are:
The steps to follow to troubleshoot DTC P1505 OBDII are as follows: