Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
Information Bus: Service and Repair
Rotunda Heat Gun
Special Tool(s)
COMMUNICATION CIRCUIT WIRING REPAIR
NOTE:
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If either circuit 914 or circuit 915 is repaired or replaced without using the following procedure, the operation of the Multiplex Communication
Network (MCN) will be degraded.
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Circuit 914 and circuit 915 must be twisted at a rate of 33-40 twists per meter before the replacement of either circuit. The twist must be within 10
centimeters of any connector termination point.
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The durability of a wire splice is dependent on getting a joint that does not oxidize. Soldering is effective in keeping the air (oxide) out of the
joined electronic circuits. Very high current circuits can fail because of oxidized joints that are not visible with the naked eye. The durability of a
splice is also dependent on keeping moisture out of the joint. Heat shrink tubing alone will not seal it. The tubing must contain a hot melt wax,
which is squeezed from both ends of the tubing during heating and forms an adhesive seal between the wire insulation and the tubing. Use
Raychem SCT(R) heat shrink tubing, Motorcraft part number WT5627 or equivalent meeting Ford specification ESB-M99D56-A2.
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Use the following procedure any time a twisted pair of circuits or circuit 70 (LB/W) is repaired.
1. Disconnect the battery ground cable.
2. Strip both wires to specification.
1
Strip one wire to expose 38 mm (1.5 in) of bare wire.
2
Strip the second wire to expose 19 mm (0.75 in) of bare wire.
