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Home >> Lincoln >> 2004 >> Aviator AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 349 (Four Wheel Drive Systems) >> Diagnosis And Testing >> Four-Wheel Drive Control Module Diagnostic Trouble Code Index >> Pinpoint Test A: No Communication With The Four-Wheel Drive (4WD) Control Module >> Normal Operation
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Normal Operation

WARNING: This page is about a different car, the 2003 Lincoln Aviator. However, it is still accessible from the selected car via links, so may be relevant.

The 4WD control module communicates with the diagnostic tool through the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communications network circuit 693 (OG). If the 4WD control module loses power it will not be able to communicate. Check power circuit 972 (BK/WH) and ground circuit 1203 (BK/LB) for open. If circuits prove out, refer to MODULE COMMUNICATIONS NETWORK for further diagnostics.

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