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Ford Truck
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2000
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F 550 4WD Super Duty V10-6.8L VIN S
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Repair and Diagnosis
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Powertrain Management
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Description and Operation
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Standard Models (Non BI-Fuel)
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PCM Inputs
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4X4 Mode Switch
4X4 Mode Switch
4x4 Mode Switch
The generic electronic module (GEM) provides the PCM with an indication of 4x4L. This input is used to adjust the shift schedule. A 5.0 volt module pull-up indicates 4x4H or 4x2 (figure 44).