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DTC's, Problems & Troubleshooting Getting an engine related DTC? Check here for assistance.

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Old 03-28-2008, 04:10 PM
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Question Pulling codes from a 94 LeSabre

Maybe someone can help me here. I have a buddy that has a '94 Buick LeSabre with the SES light on. This car, according to the emission control information label, is OBD I compliant. However, it has the 16 pin OBD II (J1962) data link connector. Is there any way I can pull the codes on this configuration without buying some fancy contraption? I already have a paper-clip and an OBD II code reader and rather not buy anything else.

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Old 03-28-2008, 04:35 PM
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ok here is where it gets interesting.

the car is technically OBD1/2. the car has OBD2 DLC but uses OBD1 codes. you need a code reader that has the OBD2 connector but can read the OBD1 codes
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Old 03-28-2008, 04:42 PM
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Ok, can the codes be displayed by the engine light on the dash by a similar method as OBD I ? If so, how?
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Old 03-28-2008, 05:58 PM
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no as mentioned above you must have a scanner that is compatible with "pre" OBD2 car (94-95)
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Old 03-28-2008, 06:11 PM
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All you need is to short 2 pins on the OBD2 connector, same as on the OBD1. IIRC, it's the 2 that are nearest the right side, but I'm not exactly sure.

This is from Wikianswers

I have the exact same pinout on my 1995 Buick LeSabre. I have been researching this issue for some time now. The VECI label abve the radiator in my car states "OBD 1 Certified." However, I believe this is only stated because the pinouts of the connector are wrong. I have the VIN L engine, and all technical docs for that engine point to it being controlled by a PCM. PCMs do not report codes by flashing the SES light, only GM ECMs do. GM cars with an ECM and a 16-pin J1850 non-OBD-II connector on them, have a pin-out of 4,5,6,9,12,16. You short pins 5 and 6 to recieve diagnostic trouble codes via the Service Engine Soon light. As you can see, those pins do not light up with our common connectors. Our connectors use pins 4,5,8,9,14,16. What I can tell you about this connector is as follows: 4=Chassis Ground, 5=Signal Ground, 8=Keyless RF Trigger (short to 5 to enter program mode), 16=Battery+. (Note 4,5=Ground 16=Battery+ are standard pins for the OBD-II standard. Yet another thing that points to an OBD-II serial uplink.) 1995 was a transition year for GM, in many different aspects including OBD-II. I believe what happened, what the pins were installed in one order believing that they conformed to standard, and then the standard changed before finalization. For more information on this, check out my regular posts to Automotive Forums.com in the Buick LeSabre forum. This is my latest: New Info: 1995 non-OBD-II 16-pin - Automotive Forums .com Car Chat
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Old 03-28-2008, 07:14 PM
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1Hot97,

Thanks for the link. I think that is going to be a big help.
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