Question about 1994 Pontiac Bonneville

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Obd1 scan tool will notaccess data from ecm engine dies check oil and check gauge light comes on engine starts right back up tried to get codes out of ecm but can not get code tool to link up with ecm GM pontiac with obd2 plug in but is obd1 ecm scan tool shows that we are connected but will not scan codes

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  •  Tasa
    Tasa Sep 03, 2013

    Lars, what you have is NEITHER an OBDI or OBDII. You have what TSB's refer to as an OBDI.5 (or one and a half). What is normally a simple task --(retrieving trouble codes) is an IMPOSSIBILITY on these 1995 GM vehicles. This is due to the fact that they lack a Ground pin (the pin designated as the "B" pin in your data link connector.) Look into the access link connector before you go to all the trouble of searching for a blown fuse or waste money on a new pcm/ecm. Look [specifically] at the upper right side of the connector and check if you have both of those[last two] pins in your connector. Most likely you will discover your vehicle lacks the "B" [ground] pin/terminal. This pin is absolutely necessary to code retrieval (even with a scantool). The dealership is one of your [few] options to acess your vehicles trouble codes.

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A couple of ways to check and see if the computer is ok first:
check engine light must come onwith they in on position
The fuel pump must run for two (2) seconds with the key ON
There must be a 5 volt reference at sensors like map, TPS
Must communicate with scan tool
The ORANGE wires at the computer are you power input wires one has 12V all the time this is your KEEP ALIVE MEMORY
one is 12 with the Key on you MUAT HAVE VOLTAGE AT BOTH
Check the computers Ground most are out under the hood and are brown wires
Try the GM TAP TEST this is a factory authorized test with the computer connected and you verified all of the above SLAP the computer with the open hand firmly not too hard but firm see if anything changes,
Do not disconnect the battery you will erase all the codes!
Please contact me if you need any additional information.
If you find the information provided helpful please give me a good rating
www.aceautomotive1.com

Posted on Aug 14, 2008

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Lars, Unfortunately what you have is NEITHER an OBDI or OBDII. You have what TSB's refer to as an OBDI.5 (or one and a half). This is frustrating in that---What is normally a simple task --(retrieving trouble codes) IS an IMPOSSIBILITY on these 1995 GM vehicles.
This 'impossibility' is due to the fact that these [1995 vehicles] LACK a Ground pin (the pin designated as the "B" pin in your data link connector.) To know if your vehicle is [indeed] one of these not [D.I.Y] code-able cars all you have to do is take a look.
And by that, I mean you need to [literally] LOOK into the access link connector. Look [specifically] at the upper right side of the connector and check if you have both of those[last two] pins in your connector. Most likely you will discover your vehicle lacks the "B" [ground] pin/terminal. This pin is absolutely necessary to code retrieval (even with a scantool). Try this before you go to all the other trouble of searching for a blown fuse or a short or heaven forbid go and waste your hard-earned money purchasing a new/remanufactured pcm/ecm that you didnt/dont actually need!
Unfortunately if you have a car with this singularity...The dealership is nearly your only option to acess your vehicles trouble codes.
Sep 03, 2013

Posted on Sep 03, 2013

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The paperclip test wont work on the OBD2.. tried it many times. i've read at other places that they're replaced all the sensors, fuel filter and even took them to the pontiac dealers. the dealers say there's nothing wrong with them. i've been having this problem for about 2 months now.  still can't find the answer

Posted on Aug 30, 2008

  •  Tasa
    Tasa Sep 03, 2013

    The ''paperclip test" [paperclip method if you will] to retrieve your vehicles trouble codes wont work for you because [provided you do have a 1995 GM vehicle] you dont actually have an OBD2. What you have is NEITHER an OBDI or OBDII. You have what TSB's refer to as an OBDI.5 (or one and a half). What is normally a simple task --(retrieving trouble codes) is an IMPOSSIBILITY on these 1995 GM vehicles. This is due to the fact that they lack a Ground pin (the pin designated as the "B" pin in your data link connector.) Look into the access link connector before you go to all the trouble of searching for a blown fuse or waste money on a new pcm/ecm. Look [specifically] at the upper right side of the connector and check if you have both of those[last two] pins in your connector. Most likely you will discover your vehicle lacks the "B" [ground] pin/terminal. This pin is absolutely necessary to code retrieval (even with a scantool). The dealership is one of your [few] options to acess your vehicles trouble codes. Now, [all that being said] IF you have a 1996 gm vehicle then the above is not applicable to your vihicle and You DO have an OBD2 system and the paperclip method [you are correct] will not work for you. You will have to use a scantool to retrieve codes from your vehicle/the OBD2 system.

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Use the paper clip trick insert one end in the a slot and the other in the b count the flashes one plus a hesitatation followed by two quick flashes indicate a code twelve etc. each trbl code will flash three times and cycle to the next just keep track until they repeat then you know you have all the trbl codes

Posted on Aug 14, 2008

  • tom reese Aug 14, 2008

    also have ign off when inserting paper clip and then turn key to on position do not start eng.

  •  Tasa
    Tasa Sep 03, 2013

    AND do NOT remove the paperclip with the key in the/any forward position(s). In other words, DO NOT insert nor remove the paperclip unless the key is in the 'OFF' position, Doing so can irrepairably damage the PCM.

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but where is the connector DLC?
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