[kjewer1]

Just a single wire? Sounds like the throttle closed switch. When the throttle plate is close, that switch has to take that green wire to ground or the ECU wont go into closed loop control of idle speed. On a 2g its the extra pin on the TPS, on a 1g its that one wire and switch. Check that the switch is working by testing for continuity to ground at that connector. Open the throttle by hand and the meter should go infinite/open.