These cars used several different types of engine controller – some have one injector for each cylinder (Tuned Port Injection, or TPI along with the LTx motors) while some have fewer injectors that are placed near the throttle body (Throttle Body Injection, or TBI) instead. When we talk about “OBD1” GM vehicles, we mean vehicles made from (approximately) 1986 to 1995. 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.(eventually this page will have more information) Basics 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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