You've completed your hardware installation and you're one step closer to starting that
engine for the first time.
At this point you should have already loaded a global file, but before the engine will
start you will need to preform a TPS auto set.
If you skip this step then the fuel pump or the injectors aren't going to receive power.
Before you preform the TPS autoset you want to mechanically make sure the throttle opens
all the way and not just by looking down in the throttle body and opening it up, you want
to have a buddy look in the throttle body while you depress your accelerator pedal all
the way to the floor and make sure that the throttle opens all the way.
If you look at the data monitor under your software and you see that the TPS readings,
reads need calibration or if you have a vehicle with a drive by wire throttle body and the
pedal position sensor says that it needs calibration, that's a dead give away that the auto set
hasn't been preformed.
If you don't have a buddy to look in the throttle body for you when you check to make sure that
it opens all the way, you can always get a little bit creative with the video camera
on your cell phone.
Once you confirm that it opens all the way, you can either go in with your lap top and
preform that TPS auto set.
I'm going to go around to the driver's side and we're going to show you how to do that.
At this point you should have mechanically checked and made sure that your throttle opens
all the way.
If you haven't you want to stop and go back and do that, you don't want to shrug that
step off.
Over the years I've fixed countless cars that people complained were slow by just making
sure that the throttle actually opens up all the way.
Once you've got that confirmed you need to go in, connect your lap top to your ECU, turn
the ignition to run, and we'll need to go in and preform a TPS autoset.
You preform the TPS autoset by clicking on your sync drop down arrows, and going down
to where it says TPS autoset.
Select TPS autoset and follow the prompts on the screen.
In this case it'll tell you to make sure the ignition is on but not started, and you want
to go ahead when you're ready and click start.
Once you click start it's going to tell you to press the throttle slowly to the floor
twice and then select done.
If it was successful at the top it will say TPS autoset was successful and all you need
to do is hit OK.
Before it'll initialize the fuel pump and initialize the injectors, your going to need
to cycle the key off and then back on.
And there you have it, we've got our fuel pump running and our injectors.
Now we can move on to some additional pre-start checks before we go to start the engine for
the first time.
So we did a TPS autoset and it was successful, but what happens if you try to do a TPS autoset
and it's not successful and it fails?
There's a couple of things that you want to check, first of all, make sure that you don't
have thick carpet or floor mats that could be giving you some erroneous readings when
you depress the pedal.
Something else you'd want to check is if you have a mechanical throttle body but you started
with a global file that was designed for a vehicle with a drive by wire, for example
an LS application, and that drive by wire ICF is still loaded in the global file, you're
going to need to remove that otherwise it's going to fail every time.
So you want to make sure that your global file matches your throttle configuration that
you have in the vehicle.
Let's say that you've got a successful auto set but you cycle that key off and back on
and the fuel pump doesn't run.
We've talked before a lot about wiring and that's usually something that's going to be
a simple wiring mistake.
A couple of things you want to do is go in and double check from your main harness installation,
there's at least 16 gauge red wire and you want to make sure that's connected directly
to battery power, and you also want to make sure that the small black ground wire is also
connected to a good clean ground.
Make sure you didn't accidentally put it through a painted surface, something that's just not
getting good connectivity because that's the ground wire for the relay that powers up the
injectors and the fuel pump and the 16 gauge red wires, the wire that sends power to that
relay as well to power up those injectors and the fuel pump.
If all of that checks out, you want to look at your main system harness, make sure that
this main relay is completely in tact, make sure that it's in tight and also check the
fuses next to it and make sure that it's not loose and make sure that something, through
an initial installation, didn't potentially short out and you've blown that fuse.
If you still can't figure out what's going on give our tech line a call and we'll try
to help you figure out what's happening in the background.
For more information and tech tips and videos on Holley EFI, go to Holley.com