LS V8-3.9L VIN A (2003)
Test D4-D5
Normal Operation
The instrument cluster communicates with the diagnostic tool through the SCP communications network circuits 4-EG7 (GY/RD) and 5E67 (BU/RD).
If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost communications can continue. Check
circuits 4-E67 (GY/RD) and 5-E67 (BU/RD) between the instrument cluster C220b and the data link connector (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 4-EG7 (GY/RD) and 5-E67 (BU/RD), damage to the
DLC C251, joint connector No.4 or damage to the instrument cluster C220b.
Possible Causes
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circuits 4-EG7 (GY/RD) and 5-EG7 (BU/RD) shorted to ground or open
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joint connector No.4 C223
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instrument cluster C220b
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DLC C251
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instrument cluster
Test E
PINPOINT TEST E: NO POWERTRAIN CONTROL MODULE (PCM) STANDARD CORPORATE PROTOCOL (SCP) NETWORK
COMMUNICATION