How to troubleshoot the fault of J1939 splitter Y cable?

How to troubleshoot the fault of J1939 splitter Y cable?

For troubleshooting the Y cable of J1939 splitter, the following steps can be followed:

Preliminary inspection and fault type determination

VISUAL INSPECTION

Check whether the cable has physical damage (such as wear, breakage, loose joints), aging insulation layer, or corrosion marks.

Check if the splitter interface is secure and if there is oxidation or poor contact at the connection terminals.

Basic electrical testing

Insulation resistance test: Use a megohmmeter to measure the insulation resistance between core wires and between core wires and ground to determine if there is a grounding or short circuit fault.

Conductivity test: Short circuit the end of the cable and use a multimeter to measure the resistance of the core wire at the beginning to confirm if there is an open circuit.

Fault type identification

Low resistance fault: It may be a direct short circuit or poor contact.

High resistance fault: may be insulation layer damage or flashover fault.

Open circuit fault: Core wire disconnected, infinite resistance.