LS V8-3.9L VIN A (2003)
Test T1-T4
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 29-ED6 (OG/YE) must be
checked for voltage and 31-ED6 (BK), and 91-ED6 (BN) 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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circuit 29-ED6 (OG/YE) open circuit
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circuit 31-ED6 (BK) open circuit
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circuit 91-ED6 (BN) open circuit
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CJB Fuse 6 (10A)