94 ranger with no power to coil pack

[Rmsullivan]

with key on engine off i have no power to any of the 4 wires that go to the coil pack. fuel pump primes, truck cranks, cel works.

probed all of the fuses and diodes in the fuse box under the hood, they all have power on both sides with key on.
swapped the ac relay for the eec relay.
messed around with the battery cables and cleaned them up.
swapped out the edis6 module, even though they never go bad.
new crank position sensor last month.

anything else to check?

for context. i brought the truck home from my shop and noticed it had a miss during the drive. while checking for the missing cylinder i checked to make sure the coil pack was plugged in all the way and the wiring harness fell onto the exhaust manifold, but i did not notice it. went to the driver side of the engine and found a plug wire that had a hole burnt into it (it shocked me) turned the truck off and went to get a new plug wire from the garage. i replaced the plug wire and then i was messing with the radio when i noticed the smoke from the wiring harness. it had melted 2 of the wires while the key was on, so i snipped out that part and spliced it back together. i have tried probing it before the splice as well.

i know that edi6 is a very simple system, so i must be missing something. should i go ahead and just replace the diode? any other suggestions? i do have another wiring harness and ecu from a 94 explorer with a 5 speed if it comes to it

 

[franklin2]

I didn't see where you got a testlight or meter and check for power. Looks like you need power at the coil red/lightgreen, and power to the module, a red wire. I would make sure the ground wire is good also.

 

[Rmsullivan]

A test light is how I know there is no power at the coil. I couldn’t remember which of the 4 wires was power, so I probed them all. Possibly I’m not getting power to the module, but I’ve already checked the fuses. I was checking for grounds last night as well and everything seems to be good there as well.

 

[Curious Hound]

Just trace it back to where you have it. Check at connectors 123 and 124. Then check at connector 105. Then check coming out of the switch. Then coming into the switch. There aren't many places for a problem in that circuit.

 

[ranger man'02]

with key on engine off i have no power to any of the 4 wires that go to the coil pack. fuel pump primes, truck cranks, cel works.

probed all of the fuses and diodes in the fuse box under the hood, they all have power on both sides with key on.
swapped the ac relay for the eec relay.
messed around with the battery cables and cleaned them up.
swapped out the edis6 module, even though they never go bad.
new crank position sensor last month.

anything else to check?

for context. i brought the truck home from my shop and noticed it had a miss during the drive. while checking for the missing cylinder i checked to make sure the coil pack was plugged in all the way and the wiring harness fell onto the exhaust manifold, but i did not notice it. went to the driver side of the engine and found a plug wire that had a hole burnt into it (it shocked me) turned the truck off and went to get a new plug wire from the garage. i replaced the plug wire and then i was messing with the radio when i noticed the smoke from the wiring harness. it had melted 2 of the wires while the key was on, so i snipped out that part and spliced it back together. i have tried probing it before the splice as well.

i know that edi6 is a very simple system, so i must be missing something. should i go ahead and just replace the diode? any other suggestions? i do have another wiring harness and ecu from a 94 explorer with a 5 speed if it comes to it

with the key on there should be power to one of the pins the other 3 are a signal from the computer its wasted spark so each of the 3 fire 2 cylinders

 

[franklin2]

A test light is how I know there is no power at the coil. I couldn’t remember which of the 4 wires was power, so I probed them all. Possibly I’m not getting power to the module, but I’ve already checked the fuses. I was checking for grounds last night as well and everything seems to be good there as well.

Looking at the diagram, that power that is missing on the coil is the red/lghtgreen. You said the fuel pump is priming? I would think that means the PCM is getting power, and if you look at the diagram, the PCM power relay is powered from the same red/lightgreen.

So that means the problem is downstream of splice S114. I would follow this red/lightgreen wire back from the coil as was suggested, you may run into the problem.