11-17-2018, 09:41 PM
the IG-coil fuse in cab box blew?.
IC COIL fuse #1 cause of blowing up is never ECU, (ECU uses FI fuse power) but EFI needs both to run car, sure.
a shorted spark coil possible.
but but,, the 2 oxygen sensors both run off the IG-coil black/white power feed,
this is the #1 cause of all IG-Coil fues blowing.
if you look at the two oxy sensors, they have 4 wires, and one is black/white (harness side on not 02 pig tail side)
these wires love to hit exhaust, with clamps for wires missing after 22 years of bad service.
and short to ground and blow IG coil fuse super easy.
see bottom left schematic, see O2 sensor pin 4? bingo shorted. super super common failure on all cars USA 1996 to now. (EPA mandated OBD2 here)
http://www.fixkick.com/ECU/1996/EFI3.jpg
hot wiring the FP relay invited blowing up ECU
better (not) is to hot wire IG-coil fuse then bad wires short catch fire.
the ECU runs of FI fuse ,in fender box.
IC COIL fuse #1 cause of blowing up is never ECU, (ECU uses FI fuse power) but EFI needs both to run car, sure.
a shorted spark coil possible.
but but,, the 2 oxygen sensors both run off the IG-coil black/white power feed,
this is the #1 cause of all IG-Coil fues blowing.
if you look at the two oxy sensors, they have 4 wires, and one is black/white (harness side on not 02 pig tail side)
these wires love to hit exhaust, with clamps for wires missing after 22 years of bad service.
and short to ground and blow IG coil fuse super easy.
see bottom left schematic, see O2 sensor pin 4? bingo shorted. super super common failure on all cars USA 1996 to now. (EPA mandated OBD2 here)
http://www.fixkick.com/ECU/1996/EFI3.jpg
hot wiring the FP relay invited blowing up ECU
better (not) is to hot wire IG-coil fuse then bad wires short catch fire.
the ECU runs of FI fuse ,in fender box.
http://www.fixkick.com