P0506

****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****











0506

DESCRIPTION
Refer to P1510, P1552.

FAILURE CONDITIONS
The ECM will set P0506 or P0507 and the MIL will turn on if for 15 seconds the ISC actuator driver circuit values and engine idle speed are not in agreement with values stored in the ECM during two driving cycles when the following conditions are met:
1. The ISC actuator passes idle air at a rate above 4.1 g/s. [for P0506] or 1.7 g/s [for P0507].
2. Engine speed deviation is below 200 RPM.
3. Vehicle speed is zero.
4. Engine coolant temperature is above 167 °F (75 °C).

This code indicates the idle speed control actuator and the engine do not agree with the ECM on the idle speed value.

Circuit Diagram:

Test Procedure Part 1:

Test Procedure Part 2: