Zero point

[Richrd]

Following you advice, Ive been trying to find out how to do a zpc, but have not found anyting that I trust. Too much conflicting or incomplete info.

So I have to ask, how do I do a zpc?

Thanks
Rich

 

[OC2003]

I bought. A handy zpctol from a guy on the face book group 4thvgen familia. He calls it the zero hero. It plugs into obd2 port and has a button. No jumping wires simple. It also has a switch for the 03-05 and 06-09 models.
His name is KC Murphy.

 

[Bumbo]

Making a tool is very simple... it cost about $8 in parts. Just buy a momentary button and an OBDII connector off amazon and short the two pins through the switch that are in the service manual.

It's a simple process, just make sure you do it on level ground.

 

[snowboardwcu]

the pinouts for certain 4th gens are different. i dont remember exact years but my 05 was different than some others. i posted about it awhile back, you can probably search and find it.

its super simple to do.

 

[Bumbo]

the pinouts for certain 4th gens are different. i dont remember exact years but my 05 was different than some others. i posted about it awhile back, you can probably search and find it.

its super simple to do.

I didn't think about that... I have a 2004, and I am using a service manual that was printed in 2003.

 

[Montego Murph]

Bumbo and Snowboard and OC are all correct.

I do build a device that makes the ZPC a simple one-handed operation. Nothing wrong with what Bumbo built.

There was a VIN split as to when the two different communication protocols were used. I don't have it with me but it is good information. It seems to be late in 2004 production year, so there are a few 2005 model year trucks that seem to have snuck through with the old style. Early uses pin 12, late uses pin 14. Other than that, the procedure is the same.

 

[Bumbo]

Bumbo and Snowboard and OC are all correct.

I do build a device that makes the ZPC a simple one-handed operation. Nothing wrong with what Bumbo built.

There was a VIN split as to when the two different communication protocols were used. I don't have it with me but it is good information. It seems to be late in 2004 production year, so there are a few 2005 model year trucks that seem to have snuck through with the old style. Early uses pin 12, late uses pin 14. Other than that, the procedure is the same.

If you are referring specifically to the OBDII communication protocols...

2004 and older uses the ISO protocol
2005 and newer use the CAN protocol

I did some reading and understand there is also CANSF... but not sure if that is being used on the newer trucks. I was only worrying about my own stuff.

The only reason I even know about this stuff is because I bought a Scanguage2 and in the process of trying to talk to the truck it inadvertently dumped the zero point while negotiating the protocol. I had to go into the menu and force ISO as default and re-calibrate zero point.

This ultimately gave me another idea (and why I made the tool), which isn’t completely tested off road yet… but if I was to dump zero point, I think it disables traction control without making modifications to the truck. Considering I cant turn it off without locking the center or being in 4WD, it made sense for off-road. Again, untested, but in theory should work.

 

[sumday]

i use a paper clip

 

[Richrd]

I got one of Murphs devices and it did the job nicely.

Thanks to all.

 

[Terminator03]

I made a similar tool with an ODBII pigtail I bought on eBay. Eventually I’ll use a momentary push button, but all I had in my spare electrical parts was a small toggle, which works just fine. Not quite as simple as a push button because you have to click it on and off, but same principle. Either way, I think having the tool is way better than crawling under the dash with paper clips.

 

[Bumbo]

It's called age... I made mine out of necessity lol

I did the first one with "paperclip method" not only was it much harder, the potential to short or cross the incorrect pins are higher.

DIY adapter simplified it for next to nothing.

 

[Terminator03]

It's called age... I made mine out of necessity lol

I did the first one with "paperclip method" not only was it much harder, the potential to short or cross the incorrect pins are higher.

DIY adapter simplified it for next to nothing.

Exactly why I decided to do it right and make the tool. I was concerned about incorrectly shorting something. Maybe age has something to do with it, but I’d much rather sit comfortably in the seat while performing the reset, rather than laying under the dash. For the money spent, it’s a no-brainer inmo. I bought a pigtail with a cable, so I just connected the switch and had it done in a few minutes, but have the other wires if I ever need to make some other tool out of it. I actually need to use again today as for reason my truck popped a p0136 code while on a trip last week. I cleared it the other day and it hasn’t returned, but of course now I’m stuck with the VSC/trac lights again.

 

[BackOff]

If you look at the OBD2 port you can visually see the pin-out, use a flashlight.

The 'Paper Clip" can be anything.
I use a piece of wire. Speaker or an old extension cord works fine.

Started with a short 6" length then made a longer one so I can sit comfortably and see the dash lights.