Not Using Suzuki Scan Tool

1) Using service wire, ground diagnosis switch terminal in monitor coupler and connect duty meter (or volt meter) between duty output terminal and ground terminal of monitor coupler.
2) Warm up engine to normal operating temperature and keep it running
at idle speed.
3) Check that idle air control duty value indicated by duty meter (or volt meter) increases when idle air adjusting screw is tightened and reduces when loosened.
If check result is as describe above, idle air adjusting screw and its passage are in good condition.
If not, idle air adjusting screw is faulty or air passage is clogged.