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Home >> Lincoln >> 2003 >> Aviator AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> 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

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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