C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ALDL pin out?

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Old Apr 7, 2005 | 01:54 AM
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articwhite90
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Default ALDL pin out?

I have searched for this but have yet to find it. Does anyone know what the pin out is for the OBDI 12pin ALDL. I know A=GND, B=Diag, and M=Data.

Thanks
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Old Apr 7, 2005 | 02:52 PM
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You can check out some of the picts and links to pinout diagrams at the bottom of the home page at:
http://www.aldlcable.com

This site also has quite a bit of information and links to the software packages available, and it explains the circuits used to make ALDL cables.
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Old Apr 7, 2005 | 06:17 PM
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What year are you interested in? It seems there has been some changes over the years. My 92 service manual says

A - ground
B - ECM diagnostic/LTPW diagnostic
C - Ride control diagnostic
F - TCC (vin P)
G - CCM diagnostic
H - Antilock brake
J - E & C bus data
K - SIR diagnostic
L - SIR serial data
M - serial data (ECM, antilock brake, CCM, heater/AC)

Hope this is of any help!
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Old Apr 8, 2005 | 10:07 AM
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articwhite90
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Blower91,

Its a 1990. What you listed looks right. I need to breakdown and buy a manual. It's just hard to shell out $100 for a book. How can data be pulled from the other pins?

Thanks for your reply.
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Old Apr 8, 2005 | 05:00 PM
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Originally Posted by articwhite90
Blower91,

Its a 1990. What you listed looks right. I need to breakdown and buy a manual. It's just hard to shell out $100 for a book. How can data be pulled from the other pins?
Ground pin G (G to A) and turn the ignition on. Then the CCM will enter diagnostic mode. It displays fault codes (in speedometer) for the CCM (module1), ECM (module4) and the EBCM (module9). End of list is indicated by "---".

Eg Datamaster uses pin M to retrieve data from the ECM. Haven't played around much with the other pins, perhaps someone else out there knows more about them.
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