1994 Legacy GT Injector Pulse Issue

[airemaggie]

Hi all!

I have a 1994 JDM Legacy GT here in the States and recently had the engine pulled for some needed camshaft work. Once reinstalled the garage was unable to get the injector pulse running and it cranks but does not start.

I have heard this could be a wiring issue and I have heard it could be an ECU issue. Things were pretty much fine prior to the engine pull, so I'm thinking the former as opposed to the latter.

Has anyone had a similar experience? Does anyone have a wiring diagram that I could share with the garage if, indeed, it is a wiring issue?

It has sat parked for a while now and I'm really missing not having it.

Thanks!

[doublechaz]

My first guess would be that the connector at the engine/trans split was damaged during the engine pull and push. 

I only have the FSM for the 1995 USDM, but I think the ECU pinout might be the same.

If your ECU has one big 84 pin connector that has a mechanical lock lever then you may find the injector signals on pins 1,2,17,18.  You would have to have access to an oscilloscope and back probe these to really see what is what on them, but you might be able to rig up a noid light to the back probe on those pins to see if the signal is present at the ECU, then you could back probe at the bell housing trans side, then the bell housing engine side, then the injectors.

 

FYI, cam sensor is at pins 5,6 and crank sensor is at 7,8 on mine.  The oscilloscope back probe at the ECU could tell you if the signal is reaching the ECU.

 

Also, I know all this from diagnosing when my cam timing jumped.  If the cam work isn't done correctly the signals from the position sensors would confuse the ECU enough to not run.  In my case only being slightly off it would skip 2 injectors' pulses, and double fire the other 2 injectors.  Took the oscilloscope to see clearly what was going on.