Help reading diagnostic codes
Melting Slicks
Joined: Mar 2008
Posts: 2,336
Likes: 1
From: North Bellmore Ny
St. Jude Donor '09
Thread Starter
Instructor
Joined: Apr 2008
Posts: 182
Likes: 0
From: New Jersey
http://www.actron.com/ this site may help
I've been doing some searching and found a 3123 gm code reader. The price seems to be just under $50. It looks like a connection tool rather than code display.
Would I get the same results using a paper clip on terminal A & B of the ALDL in my '82 and watching the Check Engine Light?
Is there a thread or site where I learn to read the codes?
Pro
Joined: Nov 2007
Posts: 741
Likes: 1
From: Woodstock GA
Thanks but they're too modern for my '82.
I've been doing some searching and found a 3123 gm code reader. The price seems to be just under $50. It looks like a connection tool rather than code display.
Would I get the same results using a paper clip on terminal A & B of the ALDL in my '82 and watching the Check Engine Light?
Is there a thread or site where I learn to read the codes?
I've been doing some searching and found a 3123 gm code reader. The price seems to be just under $50. It looks like a connection tool rather than code display.
Would I get the same results using a paper clip on terminal A & B of the ALDL in my '82 and watching the Check Engine Light?
Is there a thread or site where I learn to read the codes?
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
Actually you can use a paper clip to pull codes on your '82. Pick up a book on code reading at your auto parts store or do a Google search as it is a little too involved to go into here. 
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
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Verdad Gallardo
Thread Starter
Instructor
Joined: Apr 2008
Posts: 182
Likes: 0
From: New Jersey
The "check engine" light doesn't come on when I turn the ignition on OR when I try to enter diagnostic mode, paper clip in the ALDL A/B terminals and ignition on. The bulb checked ok.
Is my ECM is gone? It's original at 91K miles on my '82. I swapped the PROM with an Accel hi-performance PROM that's been sitting on the shelf for years and got the same result. However, I would've received an error code on the PROM if the ECM was working.
Can someone confirm my diagnosis?
edit: The car won't start but wants to. New: fuel pump, fuel pump assemble, fuel filter, fuel hoses on the tank. The fuel pump check ok via 12 volts from the ALDL but isn't getting the green light during ignition.
EDIT: New ECM on the way!
Is my ECM is gone? It's original at 91K miles on my '82. I swapped the PROM with an Accel hi-performance PROM that's been sitting on the shelf for years and got the same result. However, I would've received an error code on the PROM if the ECM was working.
Can someone confirm my diagnosis?
edit: The car won't start but wants to. New: fuel pump, fuel pump assemble, fuel filter, fuel hoses on the tank. The fuel pump check ok via 12 volts from the ALDL but isn't getting the green light during ignition.
EDIT: New ECM on the way!
Last edited by 82crossfirevette; May 3, 2008 at 07:22 PM. Reason: see edit
