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Old 03-28-2012, 05:40 PM   #1
Join Date: Jun 2011
Location: Concord, NH
Posts: 16
Rare Question

I searched, couldn't find. 93 YJ 2.5, AX5.

Does anyone have a wiring diagram for the Diagnostic Connector? I have only the Haynes Manual and, (Surprise, Surprise) they don't show the wiring diagram of the Diagnostic Connector.

So the bottom line question is: Does anyone know if any of the pins on the Diagnostic Connector are wired into the CEL circuit?

Maybe because old age is creeping up ----- 73? not yet!

I have difficulty keeping track of the code count from the CEL so as a retired EE, I said why not design a digital readout circuit that would do the counting for me?
Two obvious options are to pick up the signal by tapping into the CEL in the instrument panel or optically coupling directly to the CEL. Both have disadvantages.

Best option would be if a Diagnostic Connector pin (drivers side, firewall) had a pin synchronous with the CEL. Therefore the question.
Thanks in advance. bar

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Old 03-28-2012, 10:11 PM   #2
Timberwolf's Avatar
Join Date: Sep 2010
Posts: 863
from the chilton's wiring diagrams, the cel only comes off the PCM, pin 32, blk/pnk

the diagnostic connector uses pins 5 blk/wht, 25 pnk and 45 lt grn

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Old 03-29-2012, 08:09 AM   #3
Join Date: Jun 2011
Location: Concord, NH
Posts: 16
Thanks a lot Timberwolf. Thats just the information I was looking for!
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