I dont know whats wrong. The Led wont light up. I have 12 volts going to J3 and J11. J4 and j12 I have hooked to ground. O2 sensor is hooked to Ht- Ht+ , Vs, Ip and Vs,Ip ground. When I put 12 volts to J3 and J11 it sparks but not a like a direct short. When the DVM is hooked up to J12 and J8 it reads a constant 12 volts.

Any Help would be appreciated

 

They need 14v at 2 amps to light up.
Is your output reading about 2.5v?.
It's best to use a dummy load at first, say a brake ligh bulb, or heater element out of a old 3 wire O2 sensor.

Does the sensor get hot?.
Careful they go to like 800d **C**

 

The LED doesn't go on till the sensor heater is actually hot enough to be working.

 

Thanks Grumpy,

When the Light didnt light up I Unhooked the power. I thought somthing was wrong and I didnt want to ruin anything. The longest I ran it was about 5 seconds. Probably no long enough for the sensor to heat up. I will work with it some more tomorrow morning. How long does it take for your led to light up after you turn it on?
The Vout reads 12 volts.

[This message has been edited by AustinT (edited December 04, 2001).]

 

Vout should not be 12v!!.
Very careful double check your work and look for a *bridged* trace

My little power pack won't supply enough v to run it, I have to use it in car for it to get hot enough. Takes about 30-45 secs, some take as long as 2 mins..

 

Hi Grumpy,

, I hooked up the board again. somthing was wrong because it went up in smoke. I couldnt tell what part was burning. I have another board that I hooked up. I also tried another vehicle that put out 14 volts. With 14 volts going in the board, the heater output is 5 volts. The Vout is 2.5 volts . I left power to the board for several minutes and the sensor did not get hot and the led did not light.

 

That's not good.
Would you mind sending me the fried one so I can look at it?. maybe I can see what's wrong here.

 

yes I will send it to you. You can keep it, and if you find whats wrong please let me know. Just tell me where to mail it.

What about this other board that is giving me problems? What voltage is your heater output?

 

Hey Grumpy I have good and Bad News.

I was about to send both boards to you today but I decided to try it again. I hooked up the board that didnt burn Up, The one that was having problems with the heater. The regulator wasnt putting out enough voltage. I read and re-read the construction notes. Stupid Me, I had the regulator In backwards.
I turned the regulator around and tested the heater circut with a brake light. The brake light slowly lit up unil it was on full power. The heat sinks became warm. I was really excited so I hooked up the O2 sensor. The Voltage read 2.512 volts and the heater became hot, Way hot. The led never did light up. I decided to try it in a exhaust. First I used a Dodge Dakota. I held the sensor up inside the exhaust pipe. The voltage moved only slightly. I then Had another person rev the truck. The Voltage dropped to 2.2 volts.(Seems like it was working) I then decided to try the 89 camaro with the Holley. I agian held the O2 inside the Exhaust pipe. 2.512 volts. I had another person rev the car, It always stayed at 2.5 somthing volts.

What do You think? Seems like it was working on the dodge, but not the carbureted car. What could be the Problem with the Led?

I Know Im close, Really excited to get it going

Thanks

 

Hmm, you make 2 guys now that have done that.
Anyway, you need to get the sensor a foot or so up the pipe to begin to get any valid reading.
Try screwing it in where the oem one goes.
Depending on the exhuast system, you can have a problem with a too cool exhuast, so it winds up cooling the sensor off and that confuses the *cell*.

Just wait till you get familiar with using it

 

Tried it again on the camaro.
Voltage of battery was 14.1 volts. I let the O2 Heat for several Minutes. With the car off the DVM read 2.509 I started the car and the volts never would change.