How To: 3100 OBD1.5 to OBD2

[Crazy K]

actually, i was talking about it I had to stick a 3100 back in, but the same applies to the 94 3100 sedan too. We could also talk shop about a 3.4 DOHC conversion sometime...


this swap WILL work in a 94 obd 1.5 car, excluding Luminas (both the obd 1 3.1mpfi and obd 1.5 3.4dohc)*
now... there are 4 wiring differences between 94 and 95, which are wires present in a 95, but not a 94.

95 has two wires are for magnasteer. Magnasteer kicks ass (2.25 sport rack + plenty of low speed assist) but you need a 95+ ABS system to make it functional. so... don't worry about it.

95 has two wires are for the neutral safety switch, which is utilized through the passkey module 95+, while in 94- the actual THICK starter wire is interrupted by the NSS. If you use a 95/96/97 engine harness in a 94, you will bypass the neutral safety switch.



*1994 Luminas:
Are not equipped with passkey, and a bypassed passkey module must be added to make the car run, unless the PCM can be programmed to ignore not having passkey.
There are also several other differences in the c100 connector, which I don;t have at hand to know.

[BXX]

Ok, thanks Ken.. I remember about the Passkey when you talked to me about it..

So yeah, aside from the passkey system and magnasteer, 94 to OBD2 is straight forward..

Honestly, the passkey can prolly be ignored and use the NSS from the 96-97 so long as the PCM is reflashed to disable the passkey..

[Crazy K]

Ok, thanks Ken.. I remember about the Passkey when you talked to me about it..

So yeah, aside from the passkey system and magnasteer, 94 to OBD2 is straight forward..

Honestly, the passkey can prolly be ignored and use the NSS from the 96-97 so long as the PCM is reflashed to disable the passkey..

what? I think you misunderstood.

It you obdII swap a 94 CS, Regal, or GP using your method, you will be bypassing the NSS starter disabler, as the NSS disables a circuit that goes to the passkey module, which will not be hooked up UNLESS you use a 95+ dash harness as part of the swap.

[CSI_MuNkY]

That's a lot of Info! now my head hurts

How much of this will hold true for me to do the swap (95 3.4DOHC)?

Because I am still having my IGN SWCH1 maxi fuse blow I am considering doing an OBD 2 swap and a Big 3 upgrade in the spring. If that doesn't fix the problem I am just going to drive the car off a cliff and start anew.

Jamie

[slick]

Should be somewhat similar. I would send Ken a PM, he would know all of the minor details.