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  #1  
Old 06-16-2011, 08:36 AM
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Default Help, cant read codes on 1994 lt1 obd1

FIXED!!!!

I am trying to read the codes on my 94 z28. I have tried 2 different obd1 scanners and both of them show " The vehicle is not responding"

any ideas?

thanks

FIXED!!!!! if your having trouble getting a OBD-1 scanner to link to your computer. Use the model year 1992 and your vin code p for lt1 (if it asks for it). Thanks Craby for your help!

Last edited by cmorgan; 06-23-2011 at 07:23 PM.
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Old 06-16-2011, 09:50 AM
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94 is a unique one for trying to read codes. it is a obd1 but cannot be scanned by all obd1 scanners. you could pick up a aldl cable and read them using your laptop and tunerpro. then you could see whats goin on with the sensors as well.
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93 z28, 4 bolt block,le2 heads,le intake,58mm bbk,223/230 565/565 112,cc 1.6 rr,moroso cai & 5.5 oil pan, kooks headers&cated y,corsa cat back,patc raptor level 3 trany,2000 stall 2.5x converter&trans cooler,30# red top injectors,lt1pcmtuning tune, koni double adj, spohns 9in moser rearend, tunnel brace torque arm, shock tower brace, panhard bar, rear lower control arms, subframe connectors & hp driveline.
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Old 06-16-2011, 11:01 AM
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Check all your fuses for a blown one, primarily the fuse for the cigarette lighter/accessory.
I know the OBD2 ALDL port gets its power from there, but not positive about the OBD1 port.
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Old 06-16-2011, 11:31 AM
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Quote:
Originally Posted by craby View Post
94 is a unique one for trying to read codes. it is a obd1 but cannot be scanned by all obd1 scanners. you could pick up a aldl cable and read them using your laptop and tunerpro. then you could see whats goin on with the sensors as well.
Thanks

Where is the best/cheapest place to pick up a aldl and tunerpro?

I have a older actron that worked before on this car and now it dosent. My neighbor has a almost new $300 scanner he bought from sears and that one dosent work either.

Do you think the aldl and laptop would be able to connect?

Last edited by cmorgan; 06-16-2011 at 11:42 AM. Reason: updated
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Old 06-16-2011, 11:37 AM
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Quote:
Originally Posted by Camaro 69 View Post
Check all your fuses for a blown one, primarily the fuse for the cigarette lighter/accessory.
I know the OBD2 ALDL port gets its power from there, but not positive about the OBD1 port.
Thanks i will check the fuses later today.
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Old 06-16-2011, 12:16 PM
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heres some info to look at.
GM OBD1 Pre-1996 : Moates.Net
TunerPro and TunerPro RT - Professional Automobile Tuning Software
TunerCat
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93 z28, 4 bolt block,le2 heads,le intake,58mm bbk,223/230 565/565 112,cc 1.6 rr,moroso cai & 5.5 oil pan, kooks headers&cated y,corsa cat back,patc raptor level 3 trany,2000 stall 2.5x converter&trans cooler,30# red top injectors,lt1pcmtuning tune, koni double adj, spohns 9in moser rearend, tunnel brace torque arm, shock tower brace, panhard bar, rear lower control arms, subframe connectors & hp driveline.
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Old 06-16-2011, 12:33 PM
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If the fuses check out ok, check for power right at the ALDL port. The lower right prong (#16) should have 12 volts at it.
No power, and a scanner/reader won't communicate with the computer.
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Old 06-16-2011, 02:33 PM
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94 has the 12 pin dlc http://shbox.com/1/dlc1.jpg it is different than the pre 93 though i dont know how.
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93 z28, 4 bolt block,le2 heads,le intake,58mm bbk,223/230 565/565 112,cc 1.6 rr,moroso cai & 5.5 oil pan, kooks headers&cated y,corsa cat back,patc raptor level 3 trany,2000 stall 2.5x converter&trans cooler,30# red top injectors,lt1pcmtuning tune, koni double adj, spohns 9in moser rearend, tunnel brace torque arm, shock tower brace, panhard bar, rear lower control arms, subframe connectors & hp driveline.
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Old 06-22-2011, 05:25 PM
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I checked all the fuses in the car and under the hood, and there all good. I still cant get the scanner to link up the computer. I took it to a friends house that has a xray (brand) scanner with obd1 adapter and nothing. I have a check enging light that sometime stays on all the time and some times comes on at low speed. And most of the time when it does come on the fans start up. I really dont wanna go to a dealership.....
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Old 06-22-2011, 09:11 PM
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mine will only scann if i put it in as a 92. have you tried entering a different yr to see if it would work.
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93 z28, 4 bolt block,le2 heads,le intake,58mm bbk,223/230 565/565 112,cc 1.6 rr,moroso cai & 5.5 oil pan, kooks headers&cated y,corsa cat back,patc raptor level 3 trany,2000 stall 2.5x converter&trans cooler,30# red top injectors,lt1pcmtuning tune, koni double adj, spohns 9in moser rearend, tunnel brace torque arm, shock tower brace, panhard bar, rear lower control arms, subframe connectors & hp driveline.
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Old 06-22-2011, 09:11 PM
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