You are lucky. Well in respect to the age of your truck. It is one of the last of the OB1s they stopped using that system in 95 or 96 and went to the OB2.
OB1 can be used by the home mechanic, take a paper clip, straighten it out, now turn it into a U shape.
Now get a pen and paper, with the ignition OFF take the new fancy high tech tool you made with that paper and put it in the computer plug under the dash, in terminal A & B.
Now set back in the drivers seat, get comfortable, get your paper and pen, and turn the ignition switch to the ON position. DO NOT START IT.
The check engine light will flash the diagnostic code, 12 that will be 1 flash of the check engine light followed by a short pause then 2 more quick flashes. That code will flash 3 times.
Then will be followed by any other trouble codes that are in the system, each code will flash three times before moving on to the next code.
Now that you have all the trouble codes on your paper, you have a starting point. Just because it says you have a speed sensor problem does not mean the sensor is the problem. It can mean something as simple as a dirty plug at the sensor, or a shorted out wire.
Once you get the codes come back on and we can try and talk you threw any other checks and fixes.
My wife and I have had Burbs since 90 and will buy another when the time comes. You can not find a better all purpose vehicle.
OB1 can be used by the home mechanic, take a paper clip, straighten it out, now turn it into a U shape.
Now get a pen and paper, with the ignition OFF take the new fancy high tech tool you made with that paper and put it in the computer plug under the dash, in terminal A & B.
Now set back in the drivers seat, get comfortable, get your paper and pen, and turn the ignition switch to the ON position. DO NOT START IT.
The check engine light will flash the diagnostic code, 12 that will be 1 flash of the check engine light followed by a short pause then 2 more quick flashes. That code will flash 3 times.
Then will be followed by any other trouble codes that are in the system, each code will flash three times before moving on to the next code.
Now that you have all the trouble codes on your paper, you have a starting point. Just because it says you have a speed sensor problem does not mean the sensor is the problem. It can mean something as simple as a dirty plug at the sensor, or a shorted out wire.
Once you get the codes come back on and we can try and talk you threw any other checks and fixes.
My wife and I have had Burbs since 90 and will buy another when the time comes. You can not find a better all purpose vehicle.