ECC climate control temp sensor measurements made easier

Post by **jreed** » 30 Jul 2012, 20:22

I took a short 30s clip of the codes being blinked back by the ECC system:

[YouTube][/YouTube]

Post by **JimBee** » 01 Aug 2012, 22:28

As I noted, listening to the dampers open and close suggests they are working, but it's hard to know if they are ALL working. i had the blinking lights on my '93 850 when the damper motor was actually working properly but the damper shaft had split causing the cold feet problem.
Glad you found it and thanks for the write-up on your handy code reader!
JimBee

Post by **jreed** » 02 Aug 2012, 08:58

JimBee-- Thanks! You were right about the dampers needing attention. The best I could tell when I tested the air flow a couple of days ago (before I built the little LED code reader) was that the dampers were adjusting the flow of air to the proper positions. The ECC error codes (211, 231 and 235, which I got after building the code reader) suggest that the position feedback sensors inside the damper motors were what was not working correctly. After removing the damper motors and opening them up, there was a lot of white lithium grease residue spread over all the sensor contacts. Once I cleaned that up, the ECC system reset the error codes. All seems to be working well now.

motovovo · Post by **motovovo** » 09 Aug 2012, 21:57

Hi jreed, Is it possible the damper motors are the culprit? Maybe have a look at this.

https://www.matthewsvolvosite.com/forums ... =1&t=27239

Post by **jreed** » 13 Aug 2012, 06:14

Hi Motovovo-- Thanks for the feedback. You called it! It was a damper motor... specifically the feedback sensor inside the damper motor that tells the ECC system the position of the shaft. I removed it and cleaned it up, as described in this post.
https://www.matthewsvolvosite.com/forums ... 5&p=251432

Post by **mecheng** » 28 Oct 2014, 17:21

Are you sure you used a 5000 ohm resistor and not 500 ohm?

To get a voltage drop of 9v from a source of 12v, you need 500ohm to supply 3v (fwd voltage for blue led)

Post by **jreed** » 28 Oct 2014, 19:34

Thanks for asking. It's been a couple of years and I couldn't remember, so I went down and measured the resistor with an ohmmeter. I got 5.4kOhms. That value seems to work fine with the blue LED I'm using. A lower resistance will likely also work without burning out the LED-- try 500 Ohms and see. Good luck!

jlaakkonen · Post by **jlaakkonen** » 01 Oct 2015, 16:22

I'm having trouble clearing the codes from my 1996 850. After I've read all the codes by clicking the button it never comes back to the first one, but just keeps blinking loooong single blinks 1(long)-1(long)-1(long)-etc ... i counted out at least ten, and then i just turned the ignition off. Therefore even though I've tried to erase the codes, it doesn't let me do it. Also an interesting thing was that it read out the first three codes one after the other without me clicking the button and then the fan turned back on, after which I clicked the button for 1 sec and then got the fourth code. Does anyone know what these long blinks at the end mean?

Post by **jreed** » 02 Oct 2015, 04:44

I think that the repeating "1-1-1" means that you have successfully cleared the codes.

jlaakkonen · Post by **jlaakkonen** » 02 Oct 2015, 10:49

but it starts doing that before I even get a chance to clear the codes. I tested it again today, and today I had the patience to watch it blink 52 times

never stopped. I understood from all the instructions that at some point when going from one code to the next (by clicking the button) it gets back to the first code. But it doesn't let me do that :/ once the 1(long)-1(long)-1(long) blinking starts it doesn't let me do anything. I'll try googling some more but if anyone has an idea what it could mean, please share

Thanks!

ECC climate control temp sensor measurements made easier

Re: ECC climate control temp sensor measurements made easier