mercedes84

Update. Today I found a ECU at the boneyard, same year as mine. My engine light came back, flashing constantly (meaning no stored codes) but the problem is the fuel is old and smells really bads and the car is not starting but trying. when I spray starter fluid in the throttle body it runs strong as long as I spray but shuts down when spray stops. The fuel pump is running jumped out at the data port but still won't start and run without the spray fluid. Could my injectors be clogged since the fuel is old and smells so bad, maybe the injectors are gummed up. Any input please

Again, fuses and relays good, all dash lights on except no cel and no 12v to B+ or to FP in Data port, but with 12v jumper from battery to B+ and FP I get cel in dash and car attempts to start but sputters. That's why I asked about the ignition switch, main fusable link or any other short that may send power to the pcm. I think my mind is in the right direction but just a little more experienced help I believe will get me over this hurdle, thx

No, it comes on when the B+ in the data port is jumped out from the battery

All of the dash is lit except the cel, which is why no b+....could a faulty ignition cause this issue

Also could it be possible it could be in security shutdown mode

I want to be clear, when you say ignition switch you mean the ignition key switch that cranks the car right. I know that may be a stupid question but sometimes a switch could mean a different area maybe under the hood or lower down on the steering column or something. The main relay and efi relay are good (i swapped efi relay with horn and it worked fine)

Mine is a 1991, also thx because that info helps as far as what area to look at and start doing some voltage readings.

No issues, it ran almost like new. I didn't think think there would be many things involving the B+ area, from the main relay to EFI to B+ and fuel pump. Am I maybe missing something else

Also no cel without jumper to B+

My starter went out (1991 LS400), once I replaced it I had no fire or fuel. Here's what tests I did. First on EFI upper left 12v, upper right 3.5v, B+ .15v JUMPER to B+ efi upper left 12v, upper right 12v, no fuel pump relay voltage JUMPER to B+ and FP dataport efi upper lt 12v, upper right 12v, fuel pump relay 12v.........Basically with jumper to B+/FP dataport car would start but run poorly with some light back firing......Any help would be appreciated, thanx in advance