Freestar V6-4.2L VIN 2 (2004)
Test A4-A6
Normal Operation
The SJB communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 914 (TN/OG) and
915 (PK/LB). If one of the bus wires becomes shorted to ground or voltage, communications can continue at a degraded level. Check circuits 914
(TN/OG), and 915 (PK/LB), between the SJB C2280b 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 circuit in the SCP network, damage to the DLC C251, or damage to the SJB C2280b.
The SJB fused power (overload protected) is supplied by the bussed electrical center (BEC). Circuits 1052 (TN/BK), 1523 (DG), and 1524 (DB)
supply power to the SJB. The SJB is grounded through circuit 1205 (BK).
Possible Causes
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BEC fuses:
