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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.
You can access them by going to the link, some late 1995 vehicles were OBD2, then you would have a diagnostic connector under the dash below the steering wheel, otherwise you do it under the hood (OBD1). FORD 1983 1995 OBD1 Decoder
First thing that needs to be done is to scan the trucks computer using a scan tool that you can rent for free from your local autoparts store. The trouble code and definition that is retrieved from the scanner will help to let you know what is going on with the truck and what repairs will be needed to fix your truck.
There is no way to display trouble codes without a scan tool of some kind. Being a 1996 it uses OBD II protocol which means you can find a generic scan tool that will retrieve codes at most parts stores. Generally they will scan the codes for you for free. Just be careful about taking the parts persons advice as far as what it will take to fix the problem. Many times a parts person will recommend replacing whatever part the code says but that is often not the correct fix. For instance a code P0171 indicates an oxygen sensor is reading lean so a lot of times people will replace an oxygen sensor for that but it's rarely caused by a bad sensor . Typically it's caused by a vacuum leak or a bad mass air flow sensor or sometimes a weak fuel pump. I guess what I'm getting at is make sure you fully diagnose the vehicle. Knowing the trouble code is just the beginning there can be several causes for any given code.
There is a connector but it is not like the connector used in the newer 1996 OBD2 cars, your year uses OBD1, here is how you check for codes in this car.
Acura OBD1 Codes Retrieval
Acura vehicles 1986-95 obd1 code retrieval
There are a few different ways to retrieve the codes for "check engine light" for Acura vehicles. One method is to use a led light (sometimes 2 led lights) on the computer or controller box itself. If it has 2 led lights, the color is red and amber. The red is used for flashing the codes whereas the amber is used for adjustment. If you have only a single led light indicator, then that is used for flashing the code.
The controller box can be found by lifting the carpet of the passenger side front foot well or floorboard. You can see the led lights without removing the controller. On other models, you can find the controller under the driver or passenger front seat.
The second way to get the code is using a jumper wire on the diagnostic connector located on the kick panel at the front passenger side. You then watch the codes being flashed at the dash panel after you turn the key on. To read the code being flashed is easy. Example: Code 23 is 2 long flashes followed by 3 short flashes. A longer pause separates the next code that follows.
Here are Acura vehicles 1986-95 general codes:
Code 0 Electronic control unit (ecu) Code 1 02 (oxygen) sensor Code 3 and 5 map sensor Code 4 Crank angle sensor Code 6 Coolant temperature sensor Code 7 Throttle angle sensor Code 8 Crank angle sensor (TDC) Code 9 Crank angle sensor (CLY) Code 10 Intake air temperature sensor Code 12 EGR system fault Code 13 Atmospheric pressure sensor Code 14 Electronic air control valve Code 15 Ignition output signal Code 16 Fuel injector fault Code 17 Vehicle speed sensor Code 21 Spool solenoid valve Code 22 Valve timing oil pressure switch fault Code 23 Knock sensor Code 41 Oxygen sensor heater fault Code 43 Fuel supply system