Hi Guys,

I am from australia and tried to order the jack of the trades harnes, I then found out shipping was $95 bucks so I was not impressed.

I then went to Wiki and found the wirin diagram for the alt map harness, I made this and it works perfectley in theory, I am currently trying to find a wiring diagram showing How I integrate the AEM failsafe wire into the harness to swap back to safe maps if it detects a problem.

If anyone knows how to wire it in it would be much appreciated.

Thanks

Dale

 

come on guys, someone has to know.

 

does the AEM have a failsafe output?

what sort of voltage does it output when its good/bad?

 

Hi tephra it has a green wire that grounds when failsafe is active.

I was thinking of using a car relay and if grounded it would stop all power to the harness. What do you think?

 

so does it supply a + voltage when the failsafe isn't active (ie system ok)?

 

Um no I think it just grounds itself. It's actually a boost control release valve line that you can use to vent all boost if system has failure.

I read a forum that used the at relay to switch on or off. But I thought I would ask here as jot ha created a harness for this injection kit and I already have the harness I just need to know how to wire the aem to the harness and if it uses a relay ect.

 

hrmm thats a bit of a pain... an idea on how much current it can carry?

you would need get a relay between battery positive and the AEM failsafe line

the relay contacts would then need to connect the JoT harness (5v output) to the ECU...

 

Error driver is rated to 1.7 amps.

 

Thanks NS,

So if I use the harness with 12+ power routed through a standard relay and when the aem failsafe kicks in it will cut out the 12v power therfore switching the maps?

Is there a way I can implement the relay to also toggle a failsafe switch that will not let power run back through the harness until I let it?

 

This is the diagram you need.

 

Do you check it? Is this diagram working?

 

^^that post was made in 2010. I've been looking for this info for about 16 months now for using the stock ECU, DevilsOwn stage 2 methanol kit, and the AEM failsafe gauge. and looking at the diagram, it makes sense and I will be testing it soon to see if it works for my needs.