Freestar V6-4.2L VIN 2 (2004)
Test P4
Normal Operation
Under normal operation the diagnostic tool is connected to the DLC C251 to communicate with the standard corporate protocol (SCP), UART-based
protocol (UBP), and the international standards organization (ISO) 9141 communications networks. If communication cannot be established, the
diagnostic tool and the DLC C251 must be checked for damage. If the diagnostic tool and the DLC C251 are OK, circuit 40 (LB/WH) must be
checked for voltage and 1205 (BK), and 1203 (BK/LB) must be checked for an open condition.
Possible Causes
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DLC C251
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diagnostic tool
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power (overload protected), circuit 40 (LB/WH) open circuit
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ground circuit 1205 (BK) open circuit
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ground circuit 1203 (BK/LB) open circuit
