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Home >> Lincoln >> 2000 >> LS 3.9 A >> Repair and Diagnosis >> External Pages >> Different car >> Section 669 (Module Communications Network) >> Diagnosis And Testing >> Communications Network >> Pinpoint Test G: The Audio Control Module (ACM) Does Not Respond To The Diagnostic Tool >> Normal Operation
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Normal Operation

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

The ACM module communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 4-EG10 (GY/BK) and 5-EG10 (BU/YE). If one of the SCP communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 4-EG10 (GY/BK) and 5-EG10 (BU/YE) between the ACM C290c and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is either an open in circuits 4-EG10 (GY/BK) and 5-EG10 (BU/YE), damage to the DLC C251, the ACM C290c, or joint connector No. 4 C223.

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