HFS-3 thres problem ::repaired::
 

Hi all I have a Aquamist system with a HFS-3 controller and its recently broke. When I turn the ignition on immediately the thres light goes on and if I go check the FAV it begins to pulse softly if I turn the car on it then pulses much "harder" even at idle doesn't matter how I adjust the thres pot. These are the following test point values when car is off and just ignition is switched on.

Test point 5 +13.8V
Test point 8 +13.3V
Test point 23 +13.8V
Test point 16 +0.61V
Test point 15 +4.97V
Test point 11 +9.07V
Test point 30 +0.81V

Anyone have any idea what the issue may be?

Re: HFS-3 thres problem
 

Anyone?? :(

Re: HFS-3 thres problem
 

Can you check test point 20 for me?

Re: HFS-3 thres problem
 

Ok my controller is at work will measure on Monday thanks

Re: HFS-3 thres problem
 

Hi Richard point 20 measures 1.4v

Re: HFS-3 thres problem
 

This looks normal.
One more measurement, pin 17.

Can you take a hi-res picture of the circuit board, top and bottom. I would like to spot any obvious problems.

Re: HFS-3 thres problem
 

Ok so pin 17 has no voltage what so ever. The board blew on two spots as clearly show on the picture. The 310 resistor was completely burnt I replaced it with a 470 though maybe that was the issue but after getting the correct resistor there was not change in the controllers behavior. Thought maybe it was the IC that it goes to so I replaced that as well (will not give the part number over the open forum will PM you the part number I used if you need) and still have absolutely no change in the controllers behavior. The other place it burn is where you change between a positive and negative pwm input I made sure that there where no tracks off(the positive pwm track is off didn't bother repairing it as nothing will be going to that track). Please excuse the red and black cables soldered to the board its just so I can test it on my workbench. The Aquamist system is connected to my nissan 200sx running a haltech ecu with a negative signal going to the controller. Appreciate the help thus far.:)

http://i1171.photobucket.com/albums/...psdbe49bb0.jpg
http://i1171.photobucket.com/albums/...ps8bcf8305.jpg
http://i1171.photobucket.com/albums/...ps8f17facb.jpg

Re: HFS-3 thres problem
 

And there is the top.

http://i1171.photobucket.com/albums/...pseec5da61.jpg

Re: HFS-3 thres problem
 

The resistor you replace should be a 1M ohm not 470 (47ohm). Try the correct resistor value and retest.

Re: HFS-3 thres problem
 

http://i1171.photobucket.com/albums/...psf65050cd.jpg

I was working off this picture for the resistor value but i just put a 1M in and its working like a dream:) THANK YOU very much for your assistance!!!