I have a TC that is intermittent at locking up. It threw a PO740 a few days ago. The TC wasn't locking in. Then it started working again for a day. The light went out on its own. Today it came back on and the TC isn't locking again. Where is a good starting place to find this problem. I checked the plug on the tranny today and made sure it was plugged in good. It seem to be. Should I pull the wiring harness from the tranny to where it plugs on the motor and check it for continuity ? Or start somewhere else?