Testing an ECM/ECU/PCM out of the vehicle

[57 Handyman]

Per the title, is there a way to bench test whether an ECM/ECU/PCM is working properly? Here is my situation:

Vehicle: 92 Chev S10 4x4 with ECU 16144288 BCC BARL
Want to install: PCM 16168625 BCC BBMW out of a '93 Sierra

As part of this upgrade, I have fashioned a temporary jumper which enables me to install my 8625 without repinning the original 4288 harness and allows me to switch easily between the two computers.

I have wired the jumper using pin listings found on this site for going from a 7747 to 8625. I have checked continuity of the 4288 pins to the 8625 harness and they check out fine.

My dilemma is I purchased my 8625 on eBay some time ago and don't know for sure if it is working. As I pursue this computer upgrade, I don't want to install and have two questionable or malfunctioning components--PCM and jumper--which would totally complicate any troubleshooting efforts.

Thus, is there a way to test the PCM while not installed in the vehicle?

Thank you in advance...

[JeepsAndGuns]

There is, but you need a complete extra harness, sensors, distributor, etc...
I made this to test ecm's. I can test 161974227's 1227730's, and 1227727's.
https://www.youtube.com/watch?v=2aj9OpJUi-A

Your best bet may be to pick up another good used ecm. If that turns out to not be the issue, then it never hurts to have a spare. I usually have 1 or 2 spares.

[dave w]

Do you know anyone with a 93 ~ 95 GM Pickup or Suburban with the 4L60E or 4L80E transmission? Maybe you can test your PCM in their vehicle? Install the chip from the 93 ~ 95 GM Pickup or Suburban into your computer for the test.

I've use my 93 GM Pickup with a 4L60E to test used PCM's.

dave w

[57 Handyman]

You guys are terrific...I kind of expected one of you to have an answer!

Jeeps, I had thought about doing that and had already "targeted" one on eBay.

Dave, thanks for the potential candidate list. Now the search begins...

Thanks!