95 vortec ecm fuse

[blazin911]

I realize that but I am asking why did it pop.

my distributor was out of timing and i fixed it thanks to you guys, but im trying to figure out why my fuse is popping, is it a-coil b-control module c-ignition module

does anyone have a diagram of the ignition wiring please help

[BlazerLT]

Check all wiring going to the coil and check for wear marks or where the wiring can ground out.

[DelCoch]

On the ‘95 4x4 Vortec the ECM fuse supplies power to the PCM or VCM-A, which in turn provides power to the crankshaft sensor, ignition coil driver, fuel injectors and a host of other things, including most of the sensors on the engine that will have to do with a no start condition.

My ECM fuse (fuse #10) was popping when I engaged the cruise control. (I have no after market anything) It’s a 20 amp fuse and I ran out of 20’s, so I put in a 30 amp and it apparently fried something on the electrical side of the engine, but it didn't blow the 30 amp fuse. (No Start now and no spark) I also noticed it powered the SES light. I’ve been doing some trouble shooting and it appears the VCM-A is not supplying the AC pulse to the coil. It’s still unknown if the VCM was causing the fuse to blow or maybe the coil driver was, or one of the sensors – still trouble shooting.

[BlazerLT]

Originally Posted by DelCoch

On the ‘95 4x4 Vortec the ECM fuse supplies power to the PCM or VCM-A, which in turn provides power to the crankshaft sensor, ignition coil driver, fuel injectors and a host of other things, including most of the sensors on the engine that will have to do with a no start condition.

My ECM fuse (fuse #10) was popping when I engaged the cruise control. (I have no after market anything) It’s a 20 amp fuse and I ran out of 20’s, so I put in a 30 amp and it apparently fried something on the electrical side of the engine, but it didn't blow the 30 amp fuse. (No Start now and no spark) I also noticed it powered the SES light. I’ve been doing some trouble shooting and it appears the VCM-A is not supplying the AC pulse to the coil. It’s still unknown if the VCM was causing the fuse to blow or maybe the coil driver was, or one of the sensors – still trouble shooting.

You are lucky you only fried something electrical instead of causing a fire.

NEVER EVER put a bigger fuse in to cure a problem.

[DelCoch]

Originally Posted by BlazerLT

You are lucky you only fried something electrical instead of causing a fire . . .

Actually, it would be a blessing if this piece of crap caught on fire, then I could collect on the insurance. Hmmmmmmmmmm . . . . . .

[blazin911]

almost forgot to mention i was under my truck to the rear where the gas tank is checking stuff out and discovered a ground wire from the gas cap housing to the axle and joined by another ground going to the fuel sending unit and pump it was rotted and in pieces come to find out thats one of the reasons my truck wouldnt start. thats one for all the fellas out there

thats probably what was popping my fuse all this time

[old_master]

If the wire you're referring to is the fuel pump ground, yes, that would stop the fuel pump from running. It will not cause a fuse to pop, ground wires are not fused.

[blazin911]

i was wondering if you were here or not, any ideas on why my fuse pops i thought that if the pump wasnot grounded that that was the problem but now im back to square one

i need help with this ecm ignition fuse kind of tricky checked coil, module to coil, wiring to coil, my distributor is new, my timing is on the money, plugs ok, plug wires ok

ok started a new thread on this, hope someone can help, my ecm ignition fuse is popping every 3or4 days but dont know what it is

[old_master]

Chilton and/or Haynes manuals have wiring schematics in them so you can see everything that is protected by that fuse and trace the wiring for a short circuit. If your vehicle is a "late" 95 and equipped with OBDII, PM me with your email address and I'll send you a pdf that covers 96 S&T series wiring. If your vehicle is not equipped with OBDII this schematic will do you no good.


EDIT: You had a DTC P1345, the vehicle is equipped with OBDII.

[rlith]

Originally Posted by blazin911

ok started a new thread on this, hope someone can help, my ecm ignition fuse is popping every 3or4 days but dont know what it is

Most likely a bad ignition switch (common). Sounds like it's grounding out sometimes, then blows the fuse. Replace ignition switch.