wire harness to ECU connection - Lateral-g Forums

**Sieg** · #1 09-06-2013, 08:33 PM

Quote:

Originally Posted by DaleTx

Right now my car has a combination of old and new electrical circuits

We'll see how long that lasts.........

Having the confidence of knowing the car will fire and fuel properly 99% of the time is a priority!

DaleTx · #2 09-06-2013, 08:51 PM

Quote:

Originally Posted by Sieg

We'll see how long that lasts.........

Having the confidence of knowing the car will fire and fuel properly 99% of the time is a priority!

It just never ends...does it! Lol.

**Sieg** · #3 09-06-2013, 09:27 PM

Quote:

Originally Posted by DaleTx

It just never ends...does it! Lol.

Sounds like you'll be in the garage this weekend? I might get a wild hair and give you a call.

**GregWeld** · #4 09-07-2013, 06:51 AM

Just my quick 2 cents ====

ECU's etc aren't made to run pumps --- THEY MUST BE connected to a RELAY to run the pump. 9.8V is more than enough to run a relay....

I didn't go back to read the thread so maybe this isn't even worth mentioning...

**GregWeld** · #5 09-07-2013, 08:13 AM

Sorry Dale -- Went back to look at the thread and see you're running to a controller / relay.... so my info is useless! Normal for me, I know.

Just to be sure -- is that pin out 12V POSITIVE or NEGATIVE --- lots of times people fail to see these are ground outputs (or actually that they just go to ground)... So again - I know it USED to work -- but just tossing out stuff to look for.

DaleTx · #6 09-07-2013, 08:57 AM

Quote:

Originally Posted by Sieg

Sounds like you'll be in the garage this weekend? I might get a wild hair and give you a call.

I will be home Saturday afternoon and most of the day Sunday. Call to make sure I'm here... if you get the wild hair

Quote:

Originally Posted by GregWeld

Sorry Dale -- Went back to look at the thread and see you're running to a controller / relay.... so my info is useless! Normal for me, I know.

Just to be sure -- is that pin out 12V POSITIVE or NEGATIVE --- lots of times people fail to see these are ground outputs (or actually that they just go to ground)... So again - I know it USED to work -- but just tossing out stuff to look for.

Greg... I appreciate you tossing stuff out. My controller outputs to the fan relay, and the fault light are both negative outputs.

**GregWeld** · #7 09-07-2013, 09:53 AM

Sounds to me you might have isolated the issue already.... unless I'm just all messed up. Which is usually the case.

The ECU pin out is NEGATIVE -- so it doesn't actually put out any "voltage" -- it just goes to ground - thus grounding the relay actuating it. The relay would have a big gauge wire ground - big gauge load positive - ignition 12V positive - and a ground. In this case the ground would go to the ECU...

correct me if I'm wrong -- so then the RELAY operates some kind of pump controller??? Or does the pump "controller" run the relay??

It's so hard to troubleshoot without a schematic to follow so I'm just picturing in my head - your particular set up and I'm unfamiliar with the Vaporworks (other than I know Carl and he and his stuff are GREAT!).