P1508

****Some values in these diagnostic procedures are incorrect, refer to the following 2 tables for updated values or to TSB - 03-36-024 for updated values****











P1508

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 directions 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 ISC actuator is inserted.

FAILURE CONDITION
The ECM will set a code and the MIL will turn on if ISC actuator's opening coil driver stage [for P1510] or closing coil driver stage [for P1552] is shorted to battery voltage during two driving cycles.

Circuit Diagram:

Test Procedure Part 1: