I know the procedure to pull an error code from the ECU, but I also noticed the pot that you turn with a small screwdriver to get the ECU into the "Display Error Code Mode" has a sticker labled "Idle Adjust" So it seems to me that there are multiple modes you can get into depending on how many times the LED blinks and you turn the pot to a certain direction. Like for error code mode, I think you wait till the Red LED Blinks 3 times, but what about for 1 time, or 2 times or 4 times?? Is there any info on what the other modes are or if you can really adjust the idle speed directly at the ECU?

 

i believe the modes are as follows (i'll check my fsm to make sure)
1: normal mode
2: a/f ratio
3: diagnostics mode
4: throttle sensor check/speed sensor check/ecu code reset
5: real time diagnostics mode