What was the procedure to find out what were the last few codes thrown by the computer??

 

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| 1 2 3 4 5 6 |
| 7 8 9 10 11 12 |
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DISPLAYING THE TROUBLE CODES
Run a wire/hairpin from Pin 6 to Pin 12 with the ignition off (although on later cars it should be from Pin 5 to Pin 6), then turning the ignition to the on position without starting the engine will flash the "Service Engine Soon" light in the following sequence: flash, pause, flash-flash, long pause flash, pause, flash-flash, long pause flash, pause, flash-flash, long pause Following this "12" code repeating three times will come any trouble codes stored, flashing each of them three times. If you do not see the "12" flash three times, your diagnostic circuit is defective.
Some vehicles will display stored trouble codes, then "12" again, followed by energizing "most system controlled relays." The fuel pump relay will not energize. The idle air control valve will fully extend to enable checking minimum idle speed


[This message has been edited by ron rizzotti (edited November 21, 2000).]

 

Ron,

I don't know what you define as "earlier" or "later" cars, but all ThirdGens would fall into the "later" category by your description and diagram.

The pin sockets on the ALDL are actually identified with letter designations intead of numbers. The scheme is as follows:



I just thought I'd clarify that for ThirdGens, since I'd just hate to see someone trying to ground out a serial data bit stream.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

I done what you did and I'm slighly confused (I think). How long should I be counting the flashes and pauses?

Here's what I got:
x = flash
- = pause
-- = long pause

xxxx-xx--
xxxx-xx--
xxxx-xx--
xxxx-xxx--
xxxx-xxx--
xxxx-xxx--
x-xx--
x-xx--
x-xx--
xxxx-xx--
xxxx-xx--
xxxx-xx--
xxxx-xxx--
xxxx-xxx--
xxxx-xxx--
x-xx--
x-xx--
x-xx--
xxxx-xx--
xxxx-xx--
xxxx-xx--
xxxx-xxx--
xxxx-xxx--
xxxx-xxx---
x-xx--
x-xx--
x-xx--
xxxx-xx--
xxxx-xx--
xxxx-xx--
xxxx-xxx--
xxxx-xxx--
xxxx-xxx--
x-xx--
x-xx--
x-xx--

Anyone know what numeric codes these are? Thanks.

[This message has been edited by Mike '91 Z28 (edited November 21, 2000).]

[This message has been edited by Mike '91 Z28 (edited November 21, 2000).]

 

42 and 43.. the 12 just means the diagnostic funtion is working properly.

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!