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Go Back   IWSTI.com: Subaru STI Forums > STi Technical Discussion > Engine, Power, & Performance > Water-Meth Injection / Nitrous & Intercooler Cooling


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Old 06-22-2008, 08:13 AM   #1
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Default dds3 ques?

i just installed my aquamist hfs-1 kit, i wanted to see if everything worked so i hooked the power wire up the system is grounded now heres the prob.

I sit in the car hit the button turn the gauge on ntn lights up.

i had 11.8v off the battery go to the trunk check the power coming off the 40amp relay, same voltage. i sit in the car open the junction box all wires are still connected and tight, i put the volmeter up to the terminals for the dds3 and im reading about 7 volts. (resistor in relay) so the whole system is getting power why wont the gauge turn on?


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Old 06-22-2008, 02:49 PM   #2
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Default Re: dds3 ques?

did you hook up the dimmer wire? if so make sure you dont have the dimmer all the way down it will look off
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Old 06-22-2008, 07:10 PM   #3
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Default Re: dds3 ques?

yea the dimmer is hooked up. and played with it. do i need it on or can i try pulling it. if i did that it should light up fully right?
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Old 06-22-2008, 07:24 PM   #4
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Default Re: dds3 ques?

Quote:
Originally Posted by Seth V View Post
yea the dimmer is hooked up. and played with it. do i need it on or can i try pulling it. if i did that it should light up fully right?
there is 2 dimmer wires one for the gauge and one going to the dds3 board next to the trigger wire. Pull the one next to the trigger wire to test. with the button pressed look at the dds3 board and set the jumper to pwm and see if the dds3 board works right you should here the pump kick on and the red light on the dds3 board will light up. were are you getting your +12v from for the dds3 power
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Old 06-23-2008, 05:05 PM   #5
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Default Re: dds3 ques?

the board dose not light up? its wired to the injectors, i set the jumper over the pwm prongs. and moved the dial, still ntn the pump didn't kick on or the red light didn't light up. and gauge is still unlit. any help?
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Old 06-23-2008, 05:48 PM   #6
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Default Re: dds3 ques?

double check to see if this is how you have it wired up. The 12+v that i have going to the ecu does not have to go to the ecu could be any source for switched power. Also the green wire does not have to tap the injector at the ecu could also go under the hood.

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Old 06-23-2008, 05:53 PM   #7
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Default Re: dds3 ques?

looks the same minus the fia unit. im stumped
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Old 06-23-2008, 06:02 PM   #8
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Default Re: dds3 ques?

were is your 12v and ground going to bottom right pins
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Old 06-23-2008, 06:12 PM   #9
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Default Re: dds3 ques?

12v is to the ecu b137 pin 15(ign switch.) ground is b135 pin 4 (gnd power supply)
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Old 06-23-2008, 06:17 PM   #10
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Default Re: dds3 ques?

For a test run a temp wire from the battery + to the dds3 board and a temp ground to the gorund wire also make sure the fuse is in the fuse holder for the +12v you have now
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Old 06-23-2008, 06:24 PM   #11
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Default Re: dds3 ques?

thanks ill try it after work tomorrow and let u know how it goes.


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