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Home >> Mercury >> 2004 >> Sable LS, 4D Sedan >> Repair and Diagnosis >> External Pages >> Different car >> Section 544 (Module Communications Network System) >> Diagnosis And Testing >> Communications Network >> Pinpoint Test D: The Instrument Cluster Does Not Respond To The Diagnostic Tool >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

The instrument cluster communicates with the diagnostic tool through the SCP communications network circuits 914 (TN/OG) and 915 (PK/LB). 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 at a degraded level. Check circuits 914 (TN/OG) and 915 (PK/LB) between the instrument cluster C220a 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 the SCP circuits, damage to the DLC C251, damage to the instrument cluster C220a, or a problem in the in-line connectors.

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