Looking for wiring guide for the ECU plugs in a 90-93 and a 1994?

[dsagers]

I've seen them before, can someone point me to the spreadsheet or printout of the wiring ID for the ECU plugs in a 90-93 and a 1994?
Modified by dsagers at 9:20 PM 9/20/2008

[WizardBlack]

The FSM's are downloadable on here. The plug pin assignments are at almost the very back of the book. The actual pinout descriptions are towards the beginning of the associated section of the book. FWIW, I have a 92 engine in my 94 and I didn't notice any computer-side differences at all. The CAS is different but it just a 12" relocation of one of the connectors.

[dsagers]

Wizardblack, thanks for your info.

Beside the 12" extension, did you have to modify any of the plugs for the different model year connections on the CAS?

I know the injectors and ignition are different, but the '91 injector sub harness seems to plug into the 1994 main harness like it was made for it. Ignition may take some more work...
Modified by dsagers at 10:00 PM 9/20/2008

[WizardBlack]

I have a 92 engine AND harness in my 94, but I have FSM's for both and I now have a spare 94 and spare 92 motor (to boost and built/boost for my Datsun). I will look at the 92 CAS versus the 94 harness, etc.

As I understand it, the one car has two connectors on the CAS. One for the cam angle sensor and another one for the "sub-cam angle sensor" for use when the cam angle sensor fails (not sure how often that would be). The other CAS has the connector for the cam angle sensor and a >>pig-tail<< and connector for the exact same second sensor. It simply runs about 10" over to the front-center of the engine to connect to the engine harness. I don't expect it would really have a problem either way; just run a couple wires over a bit, etc.

I really don't understand why everyone is so leery that they won't work. I would expect an SR20 CAS would work if the bolt pattern lines up. Nissan uses the same stuff on everything. Heck, my 77 Datsun uses the same crazy throttle sensing stuff that is on the VH45DE. Likewise, I grabbed a TPS from a J30 with the VG (or whatever) and it works on the VH45DE as well. The only real different to my eyes is the length of the pigtail, etc.

Not sure what stuff is different on the ignition. I have a set of harnesses for both. I know the cars with TCS have extra crap on them. Maybe the connector type is different but pulling pins or resoldering wires is easy enough. Did you find the FSM's OK?

BTW, email me at [email protected] for faster response.

[Carl H]

cas are different between early and late engines...neither are backwards compatible.the vh cas is in a league of its own, very strange when compared to all other nissan cas.

[WizardBlack]

cas are different between early and late engines...neither are backwards compatible.the vh cas is in a league of its own, very strange when compared to all other nissan cas.

You gotta be more specific than that, because I have an FSM for both and the signal patterns are identical.

On the ignition, there is a check connector on the later one (not necessary), the ground is different (old has a boss inside the spark plug valley to bolt to and the new has a boss at the back of the valve cover) and the plugs are different to connect to the ignitors; 2 x 2 for the older ones with the big metal heat sinked ignitor and the new one (evidently) looks like an SR20 black plastic ignitor with a 4x1 connector.

[Carl H]

you are correct in saying the signal patterns are the same but the actual physical setup is much different due to valve cover design.one of those pain in the arse bits that changed when nissan went from a grey gasket sealing method to a full on valve cover gasket.