Service Engine Soon light

The Service Engine Soon light came on. I opened up my Haynes manual and found the ALDL connector they describe, but the wiring on the pins does not match the drawing in the book. The book indicates I should short Pins A & B and then the light will blink a code to indicate what the trouble is. Pin A has no wire on it, so connecting these as the drawing shows would do nothing.

HELP! :eek:

what year is you'r vehicle?

1995 3.8l

If the connector is trapezoidal rather than rectangular, it is a pre-OBDII, requiring a dedicated scanner. '95 was a pivotal year, with parts from both versions. Ray

Hi,

Ray is exactly correct. I own a 95 and it's an odd year to get the codes out of. You actually get OBD-II codes out of it, but you need the GM OBD I cable/connector. I own an AUTO X-RAY OBD-II scanner and had to purchase the GM OBD I cable. Works sweet. Check them out at

http://www.autoxray.com


C. Smith

hi the engine service light came on in my 98 transport i put it into the local dealer they said a bit of hard carbon had lodged in the egr valve anyway it looks like they were correct as the fault has cleared and has not come back

I had the same problem when my 96' miss-fired at start up. It came back around and ran fine but the light stayed on for a day. i changed the oil and for whatever reason the light went back off. I suspected carbon also in my emission system. The owners manual says this may happen when you put fuel in the car an dthe cap wasn't in place right, the electrical system getting wet, low on fuel, or bad gas. I don't know forsure what it was but it went out and the car is running fine.

Hello
you should build a simple interface (www.pontiac-interface.de) to connect to the ALDL-connector and download the free program for diagnosis. This program is for all 3.8 1992-1996.

Hello
you should build a simple interface (www.pontiac-interface.de) to connect to the ALDL-connector and download the free program for diagnosis. This program is for all 3.8 1992-1996.

How about an English version? The website you directed me to was a foreign site (Danish? German?) that I cannot read.

Hello
all the diagnostic programs are in English. To build the ALDL interface you can also use this page

http://pweb.de.uu.net/pr-meyer.h/aldl.htm

download the programs from

http://www.pontiac-transsport.de/modules.php?op=modload&name=Downloads&file=index&req=viewdownload&cid=1

Greetings
Bessi