Bad ALDL?

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jonmetz
Posts: 2
Joined: Thu Jun 09, 2022 12:39 am

Bad ALDL?

Post by jonmetz »

1994 Corvette, LT1, OBDI with 16 pin OBDII ALDL.
I have tried a few different commercial scanning tools and TunerPro with an ALDL-USB cable and can't get any information or data. I suspect that there is an issue with the ALDL. How can I test the ALDL to make sure it is functioning correctly? I am able to pull DTCs using the "paperclip" method.
rebeccashirk
Posts: 2
Joined: Thu Aug 03, 2023 11:09 pm

Re: Bad ALDL?

Post by rebeccashirk »

I think you should check for power and ground.pizza tower Use a multimeter to check for the presence of power and ground signals on the ALDL connector. You should see battery voltage on pin 16 and ground on pins 4 and 5. If you don't see these signals, there may be an issue with the wiring or the ECM.
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