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Home >> Mercury >> 2009 >> Sable Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1406 (Cruise Control System - Speed Control) >> Diagnostic Tests >> Speed Control >> Pinpoint Tests >> Pinpoint Test C: DTC P0579 or P0581 - Cruise Control Switch Circuit Failure >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

The PCM sends a signal through circuit 151 (LB/BK) to the speed control switches, which passes through the clockspring. The return signal is sent through circuit 848 (DG/OG) and the clockspring.

DTC P0579 (Cruise Control Switch Circuit Failure) - may set when the speed control switch circuits are open, shorted to voltage or shorted to ground.

DTC P0581 (Cruise Control Switch Circuit Failure) - sets when the speed control switch circuits are shorted to voltage or open.

This pinpoint test is intended to diagnose the following:

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