Anyone have a 1996 OBDII diagnostic circuit diagram handy?

My book, yea one of them cheap ones, it assumes all 80 tru 96 trucks are OBDI.

Swapping a 96 F150 cab onto my 94 F250 (OBDI), swapping heater boxes over tonight I noticed a OBDII test port staring me in the kisser under the 96 dash.

Need know what if any effects its presents might be?

Thinking more and likely none? but would like a look see a minute at a diagram see if need swap out the in cab harness.

Many thanks, Dan

 

Dan is this what you wanted?




Wire #107 (P), Data Link FEPS goes to the computer pin #13.
/

 

Yes thank you very much.

However after seeing that now I'm thinking I'd need see the bulk head pinouts for both systems.
One thing I had not thought of, taken into consideration is the OBDI is 60 pin, the OBDII 104.

They might not be pinned equally at the firewall and or the OBDI even use the same pin count in those connectors, even though outward appearance at least? those connectors are the same for both systems.

Might prove easier/faster then chasing down every circuit, if I just change out the in cab harness a minute, well more then a "minute" likely bout an hour! Then I'd know they'll be no mismatch in either area.

My initial thought was the circuits would simply go to same pins, and or unused pins on the PCM itself, or terminate nowhere. Due to tendency not include wire/circuit where not needed, as in harness are not created equally.

 

The OBD-1 EFI system doesn't have an in-cab diagnostic connector at all and besides that there isn't a great possibility any of the dash wiring in the '96 cab will connect to your '94 truck chassis and engine bay harnesses so it may be easier to just put the complete '94 dash and wiring into the newer cab.

 

Yea I swapped it, the thought the 96 cab was OBDII just didn't occur to me, not until I noticed that test port. First thought when I noticed it might be those test port circuits just be dead end go no where connected to the 94.

The firewall connectors are the same physically as in would plug in but the 94 has pins occupied in the connectors where the 96 doesn't and then vise versa too.

Rather then chase down each circuit likely get into bunch of repining and adding / removing the odd circuit, it was much faster to swap the harness.

Been too easy had the cab been from a OBDI truck! its ok though this cab is well worth little extra work change it over.

 

They can NEVER make anything easy, can they???

 

No!

And I should have assumed the 96 F150 was OBDII until proven otherwise, had I put that much thought into it that is.

Didn't matter and in fact told the guy I'd take the empty shell if that was how he wanted to sell it.

When I picked it up I thought how nice gray interior to boot and complete even, save me little bit of time. Knew I'd have to pull the seat and flooring, I was pulling the heater box noticed the test port.

My 94 doesn't have air the 96 did, I didn't want that huge blower box sticking out under the hood as I have no intention of adding air. Put the regular box from the 94 on.

Another way look at it too, now it has the 94 outer dash, no little crack. And the 96 inner dash, no hardware store "L" bracket repair at passenger side end. The 96 inner dash has that factory recall? repair bracket, looks better. Yea can't see it with the panel on but still!

 

One last difference, the safety belt harness for the 96 won't plug into the 94 harness in the cab.

 

Yeah!!!
What a nuisance it is to OWN a '96 F-150 for that reason.
It's a "one year only, one model only (plus Bronco)" on almost everything electronic it seems....and some things mechanical.