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Home >> Lincoln >> 2004 >> LS V6-3.0L DOHC VIN S >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Communications Network >> Pinpoint Tests >> Test D
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Test D

PINPOINT TEST D: THE INSTRUMENT CLUSTER DOES NOT RESPOND TO THE DIAGNOSTIC TOOL


Test D1-D2:






Test D2-D3:






Test D4-D5:






Normal Operation
The instrument cluster communicates with the diagnostic tool through the SCP communications network circuits 4-EG7 (GY/RD) and 5-EG7 (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-EG7 (GY/RD) and 5-EG7 (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-EG7 (BU/RD), damage to the DLC C251, joint connector No.4 or damage to the instrument cluster C220b.

Possible Causes
- circuits 4-EG7 (GY/RD) and 5-EG7 (BU/RD) shorted to ground or open
- joint connector No.4 C223
- instrument cluster C220b
- DLC C251
- instrument cluster
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