how to disassembly the throtle plug

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Kind of what Pushrod is saying: If you're asking how to do this, it's probably not in your skill set to approach it. If you have a broken wire, it will need to be replaced or repaired. Sometimes, if it's close to the connector, the terminal can be extracted carefully from the connector and then a new proper identical terminal end can be inserted. Sometimes, the hard shell connector will need to be replaced with a "pigtail" of wires that all need to be repaired. You'll need some local guidance - and you'll be able to solve your problem.