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Old 12-25-2010, 03:34 AM
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1996 Chevy Astro strange OBD

Hi guys!

My dad and me have troubles reading out data from our 1996 Chevrolet Astro. It is a VIN W L35 Truck. Most likely an export model. The ECM reads 16197427 BNBJ.

The connector underneath the dash looks like this, but only the A,B,G,H and M terminals exist.

We wanted to have it read out at a mechanic at the US Airbase in Frankfurt, being specialized in US Cars. He tried several scanners, with no success.

In Vienna we went to another US Car dealer. He could read it out with no problems. He told us it was OBDII. He could read live-data such as injector band-width, throttle position, o2 sensor data etc...

We bought a USB OBD interface as well as a GM 12pin to OBD adapter but I canīt get a connection. Some people say it is ALDL, some say it might be OBD1.5

Did anybody already have the same problem?

What interface do we need?

The dealer in Vienna told us, that it runs incredibly rich, because the injector puls width doesnīt go back to a normal value any more, o2 sensor is working though.

thanks for your help in advance



Last edited by UngerMarkus; 12-25-2010 at 03:51 AM.
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Old 12-25-2010, 08:32 PM
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Put a jumper (paper clip) into terminals A + B then turn on the key but dont start the car.watch the MIL (check engine light) and count the blinks .
There should be a code 12 to start, one long blink two short blinks. It will repeat that code 3 times and then display the next code ,each code displaying 3 times like the last code. Each code should be displayed 3 times. A code 12 is normal and is for a no distributor reference pulse (as the distributor is not turning therefore no pulse).
Never heard of OBD 1.5 . Could be but the diagraham you showed is an ALDL for OBD 1 gm system. The ALDL for OBD II is a different shape and is standard for all the countries complying with an international standard agreed upon to standardize vehichles so that when exported gives a mechanic some degree of familiarity to repair procedure regardless of make model or country of origin.
The 8th digit denotes the engine/fuel control system. A "Z" in the 8th posistion is a throttle body injected unit. Most likeley you have a "W" in the 8th posistion, that is the vortec with the injectors under the intake and the are very prone to leak as the lines are plastic and tend to crack and leak.
Pull the plug on the number 5 cylinder and look for a black soot on it. If it is black and sooty then it is probably the pressure lines leaking under the intake . Lift the top off of the intake and look. You can cycle the key to run the pump . and the leak should be noticable at that point.chances are the oil is thinned out from the excess fuel.
Trouble codes wont help in this situation as they would be a result of the leaking fuel and not the cause of the problem but merely sidetracking you from the real problem.Start with the basics as allways.I suspect a large fuel leak. Good day

Last edited by latech; 12-25-2010 at 08:40 PM.
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Old 12-25-2010, 08:46 PM
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By the way, the underhood emission sticker will say if the vehicle is OBD II compliant.I doubt it is from the connector you pictured.It will be OBD 1.5 even though GM doesnt truly acknowledge this terminology.
It is an enhanced verion of OBD 1. I would not perform the jumper test outlined earlier. You will need a dedicated tester for trouble codes. I doubt it will help. Like I said , it will probably be a fuel leak under the intake.

Last edited by latech; 12-25-2010 at 08:51 PM.
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