red/green leds on ecu

[datsunan]

I'M having problems with my idle, tonight I noticed that when it is running poorly the led on the ecu is red and solid. All the sudden it starts flashing slow or goes green then red then green and the idle smooths out, it also runs ruff at higher rpms when idle is bad. It switches back and forth randomly. What causes it to switch? What is it doing when the red led is on solid? Thanks Paul

[lifegrddude]

The flashing red is generally trying to give you an error code. Some of the z31 ecu's have a list of error codes on them. What I've noticed is that sometimes a set of bad connectors to the ecu will cause this to happen even though there is nothing wrong with the car. I've had to swap out the harness connectors twice now.

[datsunan]

I thought maybe it was the connector so I tried moving it around while the car was running and the red led stayed on solid. I is a z31 ecu and I have clead and inspected my connectors they look really good. Thanks for the reply I may have to change them if I can't come up with anything else. Any other ideas out there? I would really like to know what mode the ecu is in when the red is solid, and what causes it to be solid, tps?, no I disconnect it and it stays on, jumper it it stays on but idle changes so I know it works. tried another chts runs better when its cold but it is due to the timing change, its still lumpy, then I heated the chts with a lighter and it went to hell again. Also makes no diff if I disconnect the o2, but maybe it is not working, only sometimes it kicks in and the car runs great.