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Home >> Lincoln >> 2009 >> MKZ AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1068 (Speed Control) >> Diagnostic Tests >> Speed Control >> Pinpoint Tests >> Pinpoint Test C: DTC P0579 or P0581 - Speed Control Switch Circuit Failure >> Normal Operation
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Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Milan, 2008 Lincoln MKZ, and 2008 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent to the PCM through circuit RES08 (GN/BN) and the clockspring.

DTC P0579 may set when a speed control switch is stuck or the switch circuits are open, shorted to voltage or shorted to ground.

DTC P0581 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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