Troubleshooting for cable break
|  | Description
|  | Localising the cable break
|  | Eliminating the cable break
|  | See also:
Description A defective electrical component may be displayed as cable break (loose contact, jammed switching contact or too high line resistance). Cable breaks can occur in different places, for instance:
at crimpings and plug-in contacts at vibrating parts, in places where there is a lot of cable movement, e.g. in the joint of an articulation bus, where the cable passes close to sharp-edged parts inside the transmission control unit |  |
Localising the cable break Turn ignition off. Pull connector on which the interrupted signal applies out of the transmission control unit and check contacts. Refer to circuit diagram to find out whether the break may have been caused by a connected electrical component. In doing so, the number of faults can be narrowed down. If the electrical component is intact, insert a cable jumper at this end of the cable connection between the signal line and the return line required for the signal. Use a multimeter set to resistance mode to measure between the signal line and the corresponding return line whether a cable break exists. Disconnect one after the other all connectors on which the affected signal is present, check contacts. Measure into each opened connection with the multimeter before disconnecting the next plug connection and track the cable break to the connecting point of the electrical component. If the measured value is correct, the cable break is located in the previous line section. Recheck all contacts of the faulted line segment and find defective spots. If the fault can not be localised, there may be a loose contact. The fault may be reproduced by shaking at the cables. Eliminating the cable break If abrasions, cable breaks, defective contacts or other defects have been detected, the affected cable or the electrical component has to be replaced. Eliminate the defect causing the problem. If you are certain that the cable break is not located outside the transmission control unit, replace the control unit. Reinstall the original transmission control unit and if the fault reoccurs then, the transmission control unit is probably defective. Order a control unit with the same item number and install it in the vehicle. See also:
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