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Home >> Ford >> 2003 >> Excursion 7.3 F, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - 7.3L Diesel >> Computerized Engine Controls >> Input Devices >> 4x4 Low Switch
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4x4 Low Switch

The 4x4 low switch is located on transfer case cover. The 4x4 low switch sends a ground signal to instrument cluster when in 4x4L. Using Standard Corporate Protocol (SCP), instrument cluster provides a 4x4 status signal to PCM. PCM modifies shift schedule with output signals to transmission Electronic Pressure Control (EPC) solenoid.

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