95 MEtro Check Engine Light will not stay off! HELP!

[BarneyGeo]

I had a Check ENgine light come on right after I bought the car. I put a sensor on and light stayed off for a while. It came back on showing same code. I have now replaced temp switch and fan relay to see if that was the problem. Just test drive it today and light came back on with same code. Is there anything else on this circuit that could need replacing? Or do I have a short somewhere. OH, the radiator fan works MOST of the time. I have had it quit twice with light on. (car overheated!)But most of the time it works. I just do not want to get stuck in traffic jam and overheat like I did last week!

Any and all help is GREATLY appreciated!

[Salemetro]

What code....specifically... is it throwing?

[BarneyGeo]

CODE 15 with the diagnostic fuse inserted.

[Salemetro]

If you have a VOM, I would remove the temp sensor and check resistance values as best as you can at the following temperatures:

0 (farenheight) 14,650 ohms
19 ........... 8,100 ohms
39 ........... 4,780 ohms
70 ........... 2,350 ohms
100.......... 1,250 ohms
160.......... 400 ohms
210.......... 190 ohms

If out of spec....replace

If not, Lookk closer at wiring....maybe bad ECU??

Hope this helps!

[BarneyGeo]

TEmp sensor has already been changed. Its new. Should I still need to check this. Also, not really a mechanic, what is the ECU??

[brianneves]

ive seen before where a clogged raadiator causes the engine to overheat, but since everything else is working fine on the engine it "confuses" the computer and it sends out sensor codes. you might flush the radiator. if its over 60,000 miles you should anyway!

[Salemetro]

ECU...Electronic Control Unit (computer). I would test the sensor anyway....I've seen a lot of crappy parts that came off the shelf defective. Never assume that just because a part is NEW, it is automatically Good Once you are able to test and verify a part's condition....then move on to the next link in the chain.

[WissNX01]

If it keeps throwing a code, then something still wrong. YOu need to find the cause of the code, not replace something the code points to. YOull waste alot of money, then realize its a different problem.