I read that some 1994 veichales were OBD II compatible. Is a 1994 Chevrolet Suburban OBD II compatible ?

Question

Yeah my bros sub gets the Check engine light on when he turns off the a/c.

Answer 1

OBD II (On Board Diagnostics generation 2) was developed and implemented in SOME applications in the model year 1994 for G. M. and Ford. Others were in the process, though full compliance wasn't until 1996, and even then there were some foreign manufacturers not in compliance and had to be threatened with loss of sales and Federal law suits to become compliant.
The On Board Diagnostic capabilities of all cars equipped with electronic engine management goes all the way back to the very late '70s for some cars, but for the most part didn't become universal until the early '80s.
The Suburban was NOT OBD II compliant.
If he would like to begin the process of diagnostics, it can be done on that model with a paperclip. There is no code reader required, though they are manufactured, they are not necessary.
Go here---------->

http://autorepair.about.com/library/ts/obd-i/bl-dtcs-68a.htm

...and scroll down beyond the code descriptions and read the procedure. Print the page for quick reference.
The connector you need to access is under the dashboard, just to the left of the steering column. Insert the paperclip into wells "A" & "B" and then turn the ignition to the "Run" position, but don't start it.
Each code will flash three times, then cycle on to the next code. When you se the code "12" again, all of the codes have been displayed.
Use the description chart to help identify the failure.
Use a repair or service manual available at the local parts house or book store for the proper diagnostic and repair routines.
NOTE------>
It is important to understand that the code refers to a failure in a circuit or system monitored by the PCM. It does NOT NECESSARILY point to a failed component. The component is a part of a circuit or system. Diagnose the whole system. Save a lot of money, time, and frustration by NOT throwing parts at a code and calling it repaired. A code for an oxygen sensor could be the sensor, but it could ALSO be a failing fuel pump, restricted fuel filter, broken vacuum line, or (?) etc.

Good Luck

Answer 2

OBD 1 came out in 94, all vehicles that had OBD capable systems in that year are OBD 1..some 95 had OBD 2 but few.. all 96 and newer are OBD 2..

Answer 3

All 1996 and above vehicles are OBD II compliant and it means they have OBD II system in their vehicles. It was only made mandatory for vehicle manufacturers to make OBD II compliant in 1996. All vehicles before 1996 are not OBD II but OBD I.

Answer 4

don't think so it was higher end cars for GM you can tell by the shape of the ADL connector.

Answer 5

it's an "ALDL" connector