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post #1 of (permalink) Old 08-20-2001, 08:19 PM
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reading engine codes

My '94 z71 is having a slight problem, I dunno what it is, but the check engine light comes on and turns off after five minutes every once in a while. Methinks a sensor or egr or something simple is the problem. Good oil pressure, good volts, good temp exc... it runs great. How would a person go about pulling the codes without a code reader, is it possible? I know on some cars it is, I just don't know about my truck. Maybe someone else has had this problem and knows how to fix it. I don't think it's anything bad, but it's annoying. Thanks


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post #2 of (permalink) Old 08-20-2001, 09:39 PM
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Re: reading engine codes

Connect A slot with B slot on your Test connector slot (Under dashboard near steering column). Count the times and spaces between blinks. Remember that all codes are 2 digits, each code is shown 3 times before moving on to the next one, Code 12 always shows first - don't worry about that that one is OK, (blink) (.....pause.....) (blink) (blink) would be code 12 and you read the others like that too.
The procedeure is simple
1. turn off ignition
2. cross A and B terminals
3. turn on ignition (DO NOT START)
4. read and record the codes onto paper
5. come here and tell us your findings, then we'll tell you what's wrong.

If you don't want to cross A&B terminals with a paperclip for whatever reason, you can always try to find a code reader at parts stores or wal-mart for under $30.

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post #3 of (permalink) Old 08-20-2001, 10:24 PM
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Re: reading engine codes

2 digit codes are for OBD1 systems... is the procedure the same for later model vehicles that run OBD2 (4-digit trouble codes)???

Just wondering.

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post #4 of (permalink) Old 08-21-2001, 01:33 PM
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Re: reading engine codes can't jump OBDII computers. you need a code scanner for that.

btw, there is a code key for GMs at autozone for about $5 that's already slotted for the specific computers...brakes, engine... or you can use the paper clip methos which works just as well. you jut have to make sure you're jumpin the right terminals:

F E _ C B A
G H J _ _ M

A: ground
B: diagnostic terminal
C: A.I.R.
E: serial data
F: T.C.C.
G: fuel pump
H: brake sense speed input
J: electric shift
M: serial data

that's the datalink connector terminals. not all are used on every truck.

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