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Thread: Having problems connecting via ALDL with 8625 PCM

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  1. #1
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    Having problems connecting via ALDL with 8625 PCM

    Back sometime ago, I asked a similar question and Dave W provided an answer which was to move ALDL wire from Pin E to Pin M. I recently did this by cutting the wire and attaching male and female connectors. The net effect has been "no go". I have access to a SnapOn MODIS scanner and the resulting message is unable to connect/communicate. I am not able to read anything which signifies no connection.

    I am running a self-made ECM-to-PCM adapter between my stock harness and an 8625 PCM. Any thoughts/suggestions?

  2. #2
    Super Moderator dave w's Avatar
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    I would take a second look at the ALDL wiring. The '8625 only uses 3 wires to the ALDL; pin A, pin B, and pin M. Remove the unused wires from the ALDL.

    It sometimes causes confusion with scan tools, select a 1993 '8625 $E6 vehicle by make / model / year / engine / trans. For example 1993 / GMC / K1500 / 5.7 liter / 4l60E Vin code K. The vehicle you choose might need to be different if your using $OD, $OE, or $31.

    dave w

  3. #3
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    Happy New Year to you Dave W!

    Thank you for responding and providing the insight to using a scanner. The main reason I used connectors versus pulling and re-positioning the unused ALDL wires is I could not remove the white, plastic retaining clip. Do you have a gimmick or know of a method to remove the clip without obliterating it? Thanks in advance.

  4. #4
    Super Moderator dave w's Avatar
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    One option would be to get an ALDL connector from a salvage yard vehicle that has Pins A, B, & C, to replace the existing ALDL connector. Remembering to connect old Pin E to new Pin M.

    dave w

  5. #5
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    Dave,

    Am I correct to interpret your response to say there is no easy way to remove the retaining clip without damage? Okay. To ease my salvage yard adventures and search, are OBDI connectors limited to only GM manufactured vehicles in specific years or did other automakers also install them?

  6. #6
    Super Moderator dave w's Avatar
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    Yes, GM only. Most all 1990 - 1995 (except maybe some 1995 LT1 GM vehicles) Buick, Olds, Pontiac, Chevy, GMC, and even Cadillac will have the OBD1 ALDL connector with pins A, B, & M. Chevy and GMC pickups starting in 1993. I'm betting your going to be able to find what you need at any salvage yard that has domestic GM vehicles 1990 - 1995 You will likely never ever have a such an easy and readily available salvage part to search for again!!!

    dave w

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