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Thread: Testing an ECM/ECU/PCM out of the vehicle

  1. #1
    Fuel Injected!
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    Testing an ECM/ECU/PCM out of the vehicle

    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...

  2. #2
    Fuel Injected! JeepsAndGuns's Avatar
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    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.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  3. #3
    Super Moderator dave w's Avatar
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    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

  4. #4
    Fuel Injected!
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    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!

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