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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 481 (Module Communications Network -- F250-F550 Super Duty) >> Diagnosis And Testing >> Communications Network >> Pinpoint Test F: The Trailer Brake Controller Does Not Respond To The Diagnostic Tool >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The trailer brake controller communicates with the diagnostic tool through the controller area network (CAN), circuits 1908 (WH) and 1909 (BK). Check circuits 1908 (WH) and 1909 (BK) between the trailer brake controller C2142b 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 an open in one of the CAN circuits, damage to the DLC C251, damage to the trailer brake controller C2142b, or a problem in an in-line connector.

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