91 - starts, runs 5 sec & dies; no fuel
Spent another whole frigging day trying to help a poor neighbor kid trying to get his "free" first car (91 Corolla) running, and could really use some help from Toyota experts. He got the car free because it needed a fuel pump and a starter, which I helped him replace. After driving it for 3 weeks, it died suddenly. EFI fuses were blown. Replaced fuses, and car starts, runs for 5 seconds, and dies. Starts immediately, then dies again. NO FAULT CODES. Tested the normal stuff - fuel pump works fine when jumped at diagnostic connector (Fp to B+), and fuel pressure is within spec. Tested EFI relay, Circuit opening relay (good), and worked through all the other diagnostic trees on the A-1 through A-7 charts. This car does not have a MAF sensor. Tested fuel pump (and COR), and have power to fuel pump (and COR) when cranking, but not when switch is in ON position. Seems like the only thing I haven't checked is ECM, but am concerned that I don't yet know what tells the fuel pump to stay on when COR is out of crank mode. Seems like a common 6th gen problem (looking in archives), but only tips I saw were COR and MAF. Maddening thing is it runs like a sewing machine when first started (and when fuel pump is jumpered). This is probably a simple "DOH!" fix, and I'd like to get this kid running again, but could sure use some help!
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