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Old 04-17-2015, 02:53 AM   #1
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Default Can't get A/C to work.

I've built a diypnp for my 2000 miata. I've set up A/C exactly per diyautotune's instructions. Every time I look at the transistor for input 1 its blown. I've replaced it twice. Any idea where i should go from here?
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Old 04-17-2015, 08:37 AM   #2
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how "exactly" do you have it wired?
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Old 04-17-2015, 11:00 AM   #3
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1P to the input and both 1S and 1I to the output and this is on the input 1 circuit.
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Old 04-17-2015, 11:18 AM   #4
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and you removed r14 or whatever?

I like to have the MS control the a/c activation and let the MS idle up, so I always take input 1 OUT to PE1.

then I run ALD or WLD to 1S and 1I.
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Old 04-17-2015, 05:05 PM   #5
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yes r14 is removed.
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Old 04-29-2015, 03:07 AM   #6
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Still having issues with this. I'm not sure what is going on. Still blowing the transistor. As stated above i've got it wired exactly per diypnp instructions, with r14 removed.
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Old 04-29-2015, 08:47 AM   #7
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if youre blowing transistors then you have something wired incorrectly.

it's a very simple circuit:

when you turn the a/c on it sends a ground to the input circuit, that in turn sends a ground back out to 1S and 1L--activating the a/c fan and a/c compressor relays.


I'd reach out to DIYAUTOTUNE for better advice.
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Old 04-29-2015, 11:03 AM   #8
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I'll post this here but bear in mind it's for a 2001!

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Old 04-29-2015, 11:46 AM   #9
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he's not even bring it into software.

it's going into the relay and right back out. no CPU is involved.
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Old 04-29-2015, 02:12 PM   #10
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If I have something wired wrong I can't think of what it could be. It's only three wires. A/C worked great before the DIYPNP install.
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Old 04-29-2015, 03:18 PM   #11
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it's more than three wires... it's the circuit the three wires are connected to as well.

so a transistor, 4 resistors, and an IC.

did you install U3 backwards?
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Old 04-29-2015, 03:31 PM   #12
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I wasn't aware u3 was part of the circuit so i said to myself "that is a good question". But, yes, u3 is installed correctly.
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Old 04-29-2015, 03:47 PM   #13
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move it to input two and see what happens?
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Old 04-29-2015, 08:19 PM   #14
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Is input 2 identical? Would I have to remove a resistor for this circuit as well?
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Old 04-29-2015, 08:26 PM   #15
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yeah the 2.2K one. cant remember off hand which it is.
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Old 04-30-2015, 03:46 PM   #16
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So I started the car with the a/c inputs and outputs now going through input 2 circuit. I cut out the 2.2k resistor. Turned the A/C on and nothing happened. Didn't hear the click of the a/c relay and the transistor for input 2 is just fine. I'll resolder the connections to make sure they are good, but to me they look good.
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Old 05-03-2015, 07:19 PM   #17
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Well I got it working. I used input 2. Not sure why input 1 didn't work. Also wired it through pe1 and wled. Thanks for the help everyone.
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