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 valve is to maintain idle speed according to various engine loads and conditions, and also to provide additional air during starting. The ISCA valve 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.
ECM sets DTC P1506 if the ECM detects that the ISCA(OPEN) control circuit is short to battery.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Electrical check | ● Short to battery in harness ● Contact resistance in connectors ● Faulty ISCA valve |
Enable Conditions | ● 10V < Battery voltage < 16V ● 20% < PWM output < 80% | |
Threshold Value | ● Short to battery | |
Diagnostic Time | ● 2 sec. | |
MIL On Condition | ● 2 Driving Cycles |
Temperature | Opening Coil(Ω) | Closing Coil(Ω) |
20℃(68℉) | 11.1~12.7 | 14.6~16.2 |
