Hey man, sorry to hear your having trouble with the car.
You can do this a few ways. If you are really strapped for cash, then there is a way to read the codes from the actual ecu using the blinking light method.
Yes I know there was an "Just Codes thread but I felt it was a little to General in the "Codes" it Covered so.. For this Thread instead of Just Chassis Codes and Engine Codes, it Will be More Organized and Include Diagnotic Trouble Code's as well A.K.A. OBD Codes (OBD-I & II share the same...
www.240sxforums.com
You can download the factory service manual which is free and see what you need to do.
Download the factory service manual, from here
forums.nicoclub.com
Hey whats up everyone. I noticed a lot of people are asking a lot of the same questions without searching or first looking at a factory service manual. There are also people that have answered questions that are wrong, according to the FSM. The FSM contains everything you need to know about the...
www.240sxforums.com
To be better at keeping the car running well, I suggest this route.
Get yourself a consult cable. They are really freaking cheap. These are your link to what the car is doing. It's kind of like an obd2 port but since the car is older than 1996, it's a Nissan specific connector known as the consult port. It should be located right near your fusebox in the driver or passenger side footwell.
Consult cable:
Find many great new & used options and get the best deals for 14 Pin For Nissan Consult Interface USB Car Diagnostic OBD Fault Code Cable Tool at the best online prices at eBay! Free shipping for many products!
www.ebay.com
Doesnt have to be that one. But you want it for a Nissan.
PLMS Developments
www.plmsdevelopments.com
I have a 1991 240sx Hatch I was looking at ways to get live data and to adjust small things like the IACV and see the timing in live data. The Nissan dealership has an awesome consult pad/computer thing and I noticed they used a cable similar to OBD2 plugs. I did some research and came up with...
www.240sxforums.com
Ebay has these for really cheap. I'm talking like $20.
Then you need a laptop or a tablet that can run some software. I've used ECUtalk with some success in the past. It's free and it lets you read codes and see the sensor readings.
ECUTalk - Home of projects targeting the NISSAN Consult diagnostic protocol
www.ecutalk.com.au
So once you get your cable, software, and laptop all set up, you can just plug in and see if any codes pop up. Check these codes against what the FSM has.
You can also see the voltages for each sensor. You can sit in your driveway and just look at what the car is doing. You can make them all look like dial gauges so if something is pegged at one value or is erratic, you can see it visually.
You can also let someone else drive it around while you monitor and see what's happening.
Hope you get it figured out. Don't be like me and throw a crap load of parts at it.