Alright, so I'm driving and my car throws a CEL. No loss of power, engine runs and sounds fine. But I'd like to know whats going on with my car. I have a 91 so that would be an OBD1 ecu and finding a code reader for obd1's is like finding a needle in a haystack. Does anybody know a way to check the code without a code reader and without taking it to a shop. Please let me know. THANK YOU.

 

ECU has a LED light on it?

 

you dont need a code reader.
expose your ecu and undo the bracket so you can see the back side of it (side facing the firewall) there's a little **** there, turn it all the way to one side, wait 2sec, then turn it all the way back. the LED (or CEL) will blink. refer to the FSM on how to read the blinking light and find the code.
when you're finished, turn the **** again all the way, wait 2sec and turn it back. that will clear the code.

 

Thank you for posting that, it is very useful.

 

dont want to sound dumb but where do I expose the ECU?

 

driver side kick panel.

SIG is too BIG.

WAY!

 

Download an FSM (factory service manual), it will help you alot in the long run.

 

ECU is on the passenger side, just as a correction.

 

w00t w00t another point for engine lights now that i know how to check i will ive had mine on for a month...but im sure mine is the 02 sensor

 

Where is the ecu located on an s14?

 

should be on the passenger side kick panel, download an FSM for your car

 

I found the ECU but wheres the led light on it? Do I have to take the plastic around the ecu harness connecter?

 

CEL Light will flash..

sorry about the LED thing.

 

ok so I find the ecu, I have to disconnect the ecu box from the car to turn the thing clockwise and counterclockwise before I see any CEL or LED lights blinking?

 

I had my ecu out doing the exact same thing so here you go.


Thats on a S14 so it may look a bit differnt , but it should give a general idea.