Basically you need to get to know Carth until he talks about his son Dustil. Once that happens, you can get Jordo to approach you to open up the side quest. As mentioned in this thread, you can't be on Korriban to get Jordo to approach you.
You also need to trigger Jordo before you get...
captured by the Leviathan. Because after the Leviathan, Jordo won't approach you anymore.
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