diy wb issue, gurus please help

[heavy breather]

OK against my better judgement, I am going to post this question.

I am installing a diy wb kit on my truck...I know it worked, it was used on another truck. I have it all installed and wired in, but when I power up, the led never lights. If I unplug the sensor, the led lights in seconds. When I plug the sensor in it gets hot, sizzling hot. I printed off the trouble tree from the diy site, and when I get to, #12 I believe, where you are to check voltage at U3, pin 5 I get 0 volts instead of 7-9, it also fails test # 13, where pin 4 should have 0 volts, it has 4. THe tree indicates either an issue with ISO1, R 38, or C12.

WHat exactly do I do to test these components? What am I looking for to know which of the 3 may be the issue?

I hate to post a question where there is probably an answer available on the diy wb site or even here somewhere, but I haven't been able to find this info.

I have a diy wb here which I assembled myself and attempted to compare readings between the two, but when I supplied 12 volts, the magic smoke ran out of the board...EFFN ground wire touching where it shouldn't have been

Thanks in advance for the help.

 

[heavy breather]

Re: diy wb issue, gurus please help

UUMMMM Forget I asked. I received a suggestion from a member of the Swedish Mafia to run the truck at idle and see if the led lit, and what do you know, it did. Apparently the heater circuit inthe wb board was not enough to sufficiently heat the sensor.

 

[turbodig]

Re: diy wb issue, gurus please help

UUMMMM Forget I asked. I received a suggestion from a member of the Swedish Mafia to run the truck at idle and see if the led lit, and what do you know, it did. Apparently the heater circuit inthe wb board was not enough to sufficiently heat the sensor.

My DIYs do the same thing. You can change the big resistor on the board and get it to heat more, but it's riskier from a heater burn-out perspective.

I got one of the original buy boards, and it's worked perfectly for years. Been used on dozens of trucks.

Later,

 

[heavy breather]

Re: diy wb issue, gurus please help

Yeah, thats pretty much what Jeff told me when I was crying to him about the issue....thanks for the input Dig