Weird problem - a simple fix?

[Willie G]

OK, some background - 1990 Suburban, 454 TBI - passed emissions on Saturday (running well, in other words).

On Sunday while trying to fix the dome lights I notice there is no fuse in the Horn/Dome slot. I was letting the engine warm up, so I just plugged in a fuse. The truck died immediately and will not start.

Looking at the diagnostic flowchart on Chevy Thunder, I have power to ECM pins A6 and C16 but not to B1.

Can I use a jumper from A6/C16 to B1 as a temporary fix?

Your thoughts/suggestions?

Thanks in advance.

 

[dave w]

I thought A6 was 12 Volts switched from the ignition switch? Check to see if A6 has power with the ignition switch ON / OFF. I would not jumper to A6.

I seem to remember B1 / C16 were 12 Volts from the battery. Seems very odd that C16 would have 12 volts from the battery and B1 does not have 12 volts from the battery. Well maybe it would be OK to jumper B1 / C16, but I'd disconnect the "+" cable from the battery and use an OHM meter from the "+" battery cable to B1 / C16, just to make sure there is a problem with the B1 wire? I would also OHM meter the wires from B1 / C16. Be sure to unplug the ECM from the wire harness if you use an OHM meter.

dave w