whoa hey i can put a 3rd LED up that will let me fix my AFR? i def need to do that mine is all whacked out and i have no clue how to get it fixed right

being able to calculate MPG w/o needing a full tank would be nice too 8)

 

Okay, you have one of your wires connected to the wrong pin. There are four wires on the S4 diagnostic plug. One is 12V from the main relay (B/W) and three go to the ECU. Two of these are for displaying error codes (Y/R and (Y/B) and the other one is the rich/lean indicator (Y). You've connected one of the LED's to this pin by mistake. If you want to display both error codes and mixture, you need a third LED.

Exactly the same thing.

No. You can put in an LED that'll show you if you're richer or leaner than stoichiometric like I said. Nothing more.

 

time to go try this out. great info guys thanks

 

I suppose, I think of Air:Fuel Ratio as a given number, 14.7. When I think of Air:Fuel Mixture, I think of a word, Lean, Rich, Stoich.

I guess its just me. I know they mean the same, but the way you say it, makes me think of it differently.

 

I really think I had it right but who knows The other LED that was plugged into the wrong pin, if it was, was still showing error codes the way it should. For errors that needed both LEDs, it would work fine.......

Ah, o well. I don't have them any more. Thanks for clearing that up though, I think im going to investigate to really find out now.

 

No, if it was plugged into the wrong wire it would never work properly. How could it when the wire you plugged into doesn't provide error codes?

 

good read.

 

Thanks for a good write up