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Home >> Ford >> 1999 >> Expedition 5.4 L, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Module Communications Network >> System Tests >> Notes
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System Tests: Notes

NOTE: Always check module power and ground circuits prior to replacing a control module. See appropriate wiring diagram in DATA LINK CONNECTORS, GROUND DISTRIBUTION or POWER DISTRIBUTION article in WIRING DIAGRAMS.