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there are a number of things that it could be , follow this link for instructions on how to retrieve the OBD 1 codes for your vehicle , this will tell you which sensor/switch is at fault Nissan 1983 1995 OBD1 Decoder
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
Your car is a 93 so its OBD1, 96 and newer are OBD2 so you can call your local autozone and see if they can read obd1 because most of them just read obd2 . If they do then they can hook a code reader to your car and retrieve all the codes for free! it beats any shops price for diagnostics.Thats a good place to start hope this helps and god bless.
you have a obd2 it has 16 data link connector you have to use scanner to get codes.now the obd1 system have 12 data link connectors..the top two at far right is where you put jumper wire to retrieve code.