Quote:
Originally Posted by 2000CAYukon
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I
think I get what you're saying, but maybe not.
I'm familiar with that page but I'm not quite sure what it (and you) mean, exactly.
At the bottom of that page is a table of "GM Generic Codes" which appears to be further clarified by the heading "Without Onboard Diagnostics (OBDII)."
I just don't quite understand what that last heading means unless it means that the codes listed in that table only apply to vehicles which do
not have OBDII diagnostics. If that's what it does mean, then I guess it makes sense because I
think that OBDII codes are not simple 2-digit codes. Which means that the table is a table of generic codes for OBDI vehicles only (meaning pre-1994 GM vehicles and maybe some 1994 & 1995 vehicles).
It's the "Without Onboard Diagnostics" part that I find a bit misleading. Because even pre-1994 GM cars have onboard diagnostics. It's just that they are OBDI and not OBDII.
So....... it would seem that the table is giving generic OBDI codes only.
And I
think what you are saying is that
IF I have OBDI, then I should get a code 12 no matter what.
And that if I
don't get a code 12, then I guess it means I have OBDII.
Correct?
So I take it that you think I have OBDII, and thus need a scanner to read the codes.
Correct?
Unless, of course, I'm somehow just not jumpering the A & B terminals, which is always possible but I think not the case here since I did it at least three times and with a couple of different wire jumpers.