P1553

DESCRIPTION
The Idle Speed Control (ISC) actuator has two coils that are driven by separate ECM driver stages. Depending on the pulse duty factor, the equilibrium of the magnetic forces of the two coils will result in different direction for the magnetic forces of the two coils which will result in different positions for the actuator. In parallel to the throttle valve, a bypass hose line is arranged where the SC actuator is inserted.





FAILURE CONDITIONS
The ECM will set a code and the MIL will turn on it ISC actuator's opening coil driver stage [for P1513] or closing coil driver stage [for P1553] is open or shorted to ground during two driving cycles.





TEST PROCEDURE





Open or short circuit is observed in idle air control system when ignition switch is turned on.