Hey yall. My ecm took a turn for the worst and I was wondering if anyone out there knows where I can find a replacement? 92-93 5 speed with cruise control and air conditioning. Thank yall in advance

 

What makes you think it has bit the dust?

 

Thanks for your replies. What you said about the neutral safety switch is spot on. I just grounded the middle wire to the frame as I saw on another post someone had put up. Cant wait till morning to see if thats my culprit. As far as ecm my internal regulator is shot I believe. voltage via dash gauges goes from 8-18 and speedo is very erratic. I replaced the vss when I swapped in the getrag and it has good voltage and connections. A buddy of mine said its very well possible its related to the ecm going bad.

 

Standard operating procedure. Shotgun the most expensive part first thing.

I'd be a little slow to take advice from someone that doesn't know that we use a Powertrain Control Module, not an ECM.

Odds are it's a grounding issue. In this case check the grounds to the PCM. They are just sheet metal screwed to body metal, so they get corroded where you can't see it. Also the wires can break near the crimped on terminals. Battery to body ground is pretty wimpy on these things, also. It's worth beefing it up a bit.

 

To me, this points to a grounding issue.

When mine took a dump, charging just was gone, period.

They usually die, not get flaky.........

 

Check all the connectors on the wiring harnesses. All it takes is 1 pin.
Crank sensor will make it OV. UV can be auto shutdown relay or PCM. I'd bypass the PCM with an external regulator.
Make sure the VSS drive in the tail shaft is good.

 

New battery new vss new crankshaft position sensor new alternator gap on cps is correct. Pcm grounds are good. Only problems are bouncing speedo no cruise and overcharging constantly

 

Still overcharging. I took main harness going through the dash off cleaned it and checked for broke or loose connections. Speedo is steady as a rock. Cruise control worked for about two seconds. Voltage held good for about a day. Now its overcharging again 18+ intermittently. It does it weither im driving or idling. I dont know where to go from here. Its got to be the voltage regulator inside the computer. I just cant find where else it would be. Grounds are good. Cps good. Battery good. Alternator good. Harness good. Its just cruise control and overcharging. I know I can just put an external regulator on it or put the transpo part in the back of the alternator to make it internally regulated but im unsure if ill just be masking a problem I cant find or have overlooked. If I go with either of those options will my speedo and cruise and ac and everything work like its suppose to or what. Someone out there has to have had this problem.

 

Just for grins and giggles, back probe the PCM at idle.
Pin 3 battery
Pin 57 ASD (battery)
Pin 9 Ignition (near battery)

Pin 5 ground
Pin 11 ground
Pin 12 ground

 

Im obviously not as well versed as you at this Mr. Martin. I dont know how to get into the diagrams to figure out which pins are which. Thank you again for your knowledge

 

Is there any way you could explain to me how to get into the fsm to retrieve the diagrams or which pins are which. Is it just simple like start at top left pin on connector and thats pin one then next to it towards the right is pin two or is it more complex

 

If it helps at all it didnt start doing this from the turn of a key. It was mid route on a trip back from Austin TX. 70 mph down I35 with trailer in tow then BAM! CEL came on and voltave pegged. It went back to regular voltage after just a few white knuckle minutes but its getting more frequent now. Within the first five minutes of running it pegs out for a few then levels back out. Few minutes later it pegs out again. Each spike only last a minute maybe two

 

Do you have a FSM in your possession? If you do then near the back of the electrical section is a "Pin out" for the bulk head connector, and the PCM. It shows you both view points...PCM and Wire harness connector.

 

Hey vader93,
I haven't had your issue...yet, but I did find some posts in the stickies that may help. There are a couple of electrical FSMs included that may help you.
https://www.dieseltruckresource.com/...-101-a-307266/
https://www.dieseltruckresource.com/...5/#post1107218
1992 DODGE W250 Engine Control Computers also known as (ECC / ECM / PCM / Module / etc.)

 

I do not have an FSM. Where would I obtain this