Unfortunately, the actual protocols themselves are not available publicly (if only they'd open source!), but we've attempted to collect and clarify as much as possible. If you or your mechanic has ever read the DTCs (Diagnostic Trouble Codes) on your vehicle, they are using OBD-II. Learning how to work with those protocols also means that you can determine what that Malfunction Indicator Light (MIL) (aka the Check Engine Light) on your dash is referring to when it tells you there's an engine problem. Saving the planet is great (shout out to you citizen scientists!), but what this also means is we can access other features of the car and collect information from and on those parts. In other words, OBD is the language of the Engine Control Unit (ECU), and it was designed to help fight emissions and engine failures. OBD systems are designed to monitor the performance of some of an engine's major components including those responsible for controlling emissions. On-Board Diagnostics, or "OBD," is a computer-based system built into all 1996 and later light-duty vehicles and trucks, as required by the Clean Air Act Amendments of 1990. So what exactly is the OBD specification, and why do we care? According to the Environmental Protection Agency's website: The information provided is only intended for reading from the OBD-II spec. Q - Can I get a version of the 16 pin cable with the switchable 10K O resistor?Ī - No, GM never required the 10K ohm resistor on the 16 Pin OBD1 vehicles and thus my 16 Pin cable has none.Warning! Modifying your OBD-II system to a non-certified state is considered a Federal Offense. If you have questions on the 10K ohm resistor contact me. On MOST ECMs the 10K ohm resistor either does not affect the ECM operation, OR the 10K ohm resistor is needed for data flow. Q - Why would I want to disable the resistor?Ī - On a few select ECMs the 10K O resistor is not needed for the data flow but does alter the idle speed and timing. Q - Can I disable the 10K ohm A-B resistor?Ī - Yes the 10K resistor can be switched off on the 12 Pin version. Q - Does this cable include the 10K ohm A-B resistor needed on many 12 Pin 160 Baud ECMs?
Q.- Will this work with my 94-95 6.5 Turbo-Diesel?Ī - Yes it will however you will have to download and use GMTD Scan Basic (free) or GMTD Scan Tech ($) from Make sure you order the cable that fits your cars connector. GM used 12 pin OBD1 type and 16 pin OBD2 type connectors on 94 & 95 vehicles. Q - Will this cable work with my 94/95 3800 OBD1.5?Ī - Yes it will. There are 3 things needed to access the diagnostic data stream from a GM based On Board Diagnostic 1 ( OBD1 ) system on your 1982 - 1995 car or truck.ġ - A laptop PC with an available USB portģ - A software program running with the correct stream definition for your car or truck
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