So your losing both spark and fuel, but if you jump or ground the relay you get juice to the coil and fuel pump works ok.
Am I correct? Whats the codes? Both are controlled by the PCM engine spark and fuel are PCM grounded but they may have an intermittant open, because an intermittant ground would drfinitely blow a fuse link or in your case a fuse.
Why not go to this sites schematics for the 92 3.0 injected spark and fuel control relays because in 92 you may have amother for both so there would be a 3rd. The pull in ground are common, that circuit, if good, may be shut off intentionally by a code, or a bad PCM.
In 94 a fuse number 42 was a mini DB/WT
WIRE FUSED FROM pcm TO RUN START CIRCUIT.
I don't remember if 92 still had fuse links or not. So I think you may have missed a power open to the main coil supply in the relays or an open or bad PCM. But check for codes also. I had a 92 that I used a data recorder on it was a lemon law job, had a bad connection at the map sensor, but it would shut right off, couldn, t test it and no codes but of course jumping the run relay would work. The shutdown relay controls a fuel pump seperate relay and a spark or coil relay on some. You may have two seperate issues. I got a 94 schematic, but not a 92. Bad year for all Chryslers. OK So many bad fuel pumps. Few bad PCM's.
Monday, October 5th, 2009 AT 10:28 AM