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Home >> Lincoln >> 2004 >> Aviator 2WD V8-4.6L DOHC VIN H >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Tests >> Test R
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Test R

PINPOINT TEST R: NO INSTRUMENT CLUSTER UNIVERSAL ASYNCHRONOUS RECEIVER-TRANSMITTER (UART)-BASED PROTOCOL (UBP) NETWORK COMMUNICATION


Test R1:






Test R2:






Normal Operation
The instrument cluster communicates with other modules through the UBP communications network circuit 693 (OG). If circuit 693 (OG) becomes open or shorted to ground, communications will not be possible. Check circuit 693 (OG) between the instrument cluster and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open in circuit 693 (OG), damage to the DLC C251, or damage to the instrument cluster C220b.

Possible Causes
- circuit 693 (OG) shorted to ground or open
- DLC C251
- instrument cluster C220b
- instrument cluster
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