Trouble Code 15 -- '95 SC1--Need help with resistance

[JeffBaker]

I'm getting code 15 when I short the computer. I replaced the sensor, car is cooling fine. I checked the voltage on the connector with the car in the ON position. 5 volts, like it should be.

I tested the resistance of the engine coolant temperature sensor. I'm not an electrical guy, so I had my voltmeter on 20K on the resistance side. It spit back 2.93. I ran the car for about 5 mins and tested it again. At 20K, it said .43. Are these okay readings? Do I need to retest at a different setting?

If those are fine, what else is there to check?

Thanks!

Jeff

[sierrap615]

Here are the resistances for the ECTS or IAT in various tempertures
-20 degrees F________39K-53K OHMs
0 degrees F__________21K-27K OHMs
60 degrees F_________3.9K-4.5K OHMs
120 degrees F________1.0K-1.1K OHMs
160 degrees F________430-480 OHMs
200 degrees F________215-235 OHMs

readings sound low to me. this is the new brass style ECT right? check the connector too for gunk.

[mysatilac]

HMMM... That post looks familiar...
come on sierrap, quotes should be quoted...
Here is where it came from My Post

Originally Posted by [color=red

mysatilac[/color]]
Here are the resistances for the ECTS or IAT in various tempertures
-20 degrees F________39K-53K OHMs
0 degrees F__________21K-27K OHMs
60 degrees F_________3.9K-4.5K OHMs
120 degrees F________1.0K-1.1K OHMs
160 degrees F________430-480 OHMs
200 degrees F________215-235 OHMs

Those resistances are fine,
read:
2.93K OHMs cold (about 80 degrees),
and 430 OHMs warm (about 160 degrees)
Fits right in there

[JeffBaker]

The ECTS is new, clean, brass, looks fine, and I guess it is fine...The ratio is correct between the two resistances, I was just unsure about the numbers....

So, that having been decided, why is my Check Engine light on?!? I checked all fuses, connections, etc....unhooked the batttery overnight, hooked it back up, still get same trouble code.

JB

[phattyc75]

hmmm....code 15 is coolant sensor/low temp. Did you change out the right sensor? there are two sensors right in the same vincinity that are the same style. I believe the lower one is the ECTS that shoots info to the PCM.

[JeffBaker]

Yeah the ECTS is the bottom one...btw, what is the top one w/ one wire?

[sierrap615]

Originally Posted by mysatilac

HMMM... That post looks familiar...
come on sierrap, quotes should be quoted...

hehe, ok yes i stole the numbers. but where did you get them from???

Originally Posted by mysatilac

Those resistances are fine,
read:
2.93K OHMs cold (about 80 degrees),
and 430 OHMs warm (about 160 degrees)
Fits right in there

doh! thats what i get for posting when i should be sleeping.

Originally Posted by JeffBaker

Yeah the ECTS is the bottom one...btw, what is the top one w/ one wire?

the one-wire sender is for the temp gauge on the dash. the PCM doesn't even know its there.