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

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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I have a 2002 bravada and when I was driving I turned radio off and now I have no windows,radio,locks,fuel gauge,oil gauge.checked fueses and they were ok,any suggestions?


Does it start an run ? Your best bet is to take it to a ASE certified repair shop ! All the things not working are controlled by the BCM body control module an are on the class 2 serial data bus , would be best to have hooked up to a factory scan tool to see if there are any DTC'S - diagnostic trouble codes stored . The instrument cluster gauge information comes from the PCM / ECM - engine computer over class 2 data bus .
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:
The instrument panel cluster (IPC) displays the engine oil pressure as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 psi (0 kPa) or below if:
The Body Control Module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be:
?€¢
Sensors and switches that are directly connected to the BCM


?€¢
Class 2 serial data received from other control modules connected to the class 2 serial data link.

The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message.
You best bet is to take it the dealer or a ASE certified repair shop !

Jan 03, 2016 | Cars & Trucks

Tip

OBD1 Trouble codes, without a scan tool.


Here is a tip for retrieving Diagnostic Trouble Codes (DTCs) from any OBD1 GM vehicle. <br /><br />First thing is your going to need to get a paper clip, and bend it into a U shape. <br /><br />Now stick the ends of the paper clip into the 2 top right hand side holes in the connector. Note: Do this with the key in the run position, but with the engine off.<br /><br />You should now see your check engine light flash once, pause, then 2 times. This indicates that your ECM is working properly.<br /><br />Now it will blink indicating your code. For example an EGR failure code is DTC 32. You will see your light blink 3 times, pause, then blink 2 times, giving you code 32.<br /><br />A list of codes can be found here: http://www.gmtuners.com/OBD1_DTC.htm.<br /><br />Hopefully this helps some of you all out there. Thanks for looking.

on Jan 04, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

My 92' Covette cooling fans start up about 10 seconds after I start up the car cold. Then the check engine light comes on. After about 7 minutes, the fans turn off and then the check engine light goes out....


Hey Les , how's it going ? The thing to do would be hook-up a scan tool an see what the ECM is seeing as far as engine temperature data ! Could have a shorted coolant temp. sensor . And when the check engine light is on a trouble code is present an should point you in the right diagnostic path . For some reason the engine computer thinks the engine is hot when it's not. Choosing an Automotive Scan Tool EricTheCarGuy

Mar 03, 2015 | 1992 Chevrolet Corvette

2 Answers

How do I read trouble codes for 91 geo storm? Scanners are to new to read.


that is true.
but some cars running obd1 , can be scanned,. (i have one)
like all GM cars and even older, , some ford, , Honda's . Toyota;s
but this car is GEO, (underdog, but is really what. a Isusu.)
Isuzu's cars are mostly not raced or sold here now. so who's going to make scanner for such a rare car and engine and EFI?
there is no OBD1 standard, each company uses a unique design.
then,... so...
OBD2, in 1996 a USA invention is a standard and all tools work.
so....
what you have is the old blink codes. wink wink...
all OBD1 cars work like this (or very close)
you connect a jumper wire, and the CEL lamp flashes codes.
so is the CEL stuck on? running.
must come on key on, bad lamp or bad ECU.

you can check out Isuzu Impulse

Example storm post..OBD1991 (USA)
To put the ECM (Engine Control Module/Ignition Control Module/Engine Computer) into diagnostic mode, where it will flash codes at you using the "MIL" (Malfunction Indicator Light or "Check Engine" light), short pins 1 and 3 of the ALDL/OBD1 connector using a paperclip. When you then turn the key into the on position, the MIL should flash once, then pause a bit, then flash twice. That means code "12." If there are other codes, they will be flashed out as well. All codes are two digits.
end quote, on storm

but where is the connector DLC?
and which pin is 1 an 3
so. we google more, or look it up in alldata.com like most do.

or here
http://www.robietherobot.com/storm/stormFAQ.htm

that was the 1st google hit, using clear text human questions.
DLC jumper storm or Impulse.
or diagnostic jumper Impulse.

join a Geo storm or inpulse forum and ask for scan tools.
they will be custom tools. (or hacked, as i have done)

Sep 17, 2014 | 1991 Geo Storm

1 Answer

Changed a coolant hose no problem. Went to drive the van, and the gear shifter wouldnt engage, then put it in neutral then started it, then to find out that the gas gauge, mileage gauge, blinkers, and...


The problem indicates towards tranny gear box and instrument cluster board.--------- Get the transmission fluid level checked, if its low it has to be refilled.---------- Many a times the vehicles computer system gets disturbed and and its start behaving like this.--------- Disconnect the negative battery terminal of your cars battery and wait for 30 minutes then reconnect the terminal properly.Then start and see, if same problem is noticed.--------- But if that is not helping then gear box needs to be taken apart and inspected for tranny not shifting problem.And instrument cluster board has to be taken apart from dash to check the board.--------- Also as you mentioned that ABS light is on, this indicates there is any code stored in the engine computer.-------- If you can get the car scanned , then it will be much better for you to resolve the problem.Because in scanning, it will point you towards the exact error code, and due to which part this problem is occurred.At autozone service center is absolutely free to get vehicle scanned.They do it free of charge.------------- --------------- ]For car after 1995 it requires OBD2 tool that autozone has and for car before 1995 it requires OBD1 tool.And autozone don't scan car before 1995.Because they don't have OBD1 tool.------- --------- There are very few auto parts store and repair centers who have OBD1 tool.In your car is before 1995 model then you require OBD1 tool.------ You can just contact local auto-parts store and they will guide you to the nearest store who has OBD1 tool.There you can get your car scanned.If there is error set in your cars computer, then you will receive the error code.As per error code it will point towards the faulty part causing this problem in your car.------ This will help. Thanks.Helpmech.

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1 Answer

2000 buick park avenue ultra starts sputturing and then dies while driving. no lights come on and had the codes checked . shows nothing . just drove 2,500 miles on trip run perfect . now dying again


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1 Answer

Car starts then dies


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1 Answer

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1 Answer

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