Question about 1994 Toyota Tercel

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Why is the check engine soon light on? 94 toyota tercel. I took it to a parts store to have the code checked and they told us that we need to know where the port is. Does any one know where the diagnostics port would be on a 94 toyota tercel

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To give you a better jump in the direction of the repair, your vehicle's computer operates OBD I, your average auto parts store will only carry OBD II equipment. Your ALDP should be located on the drivers side under the dash near the door. This is the most typical location for it, however, not the only location. From time to time you may find on either side of the center console under the dash, closer to the firewall. Some vehicles even have a special port on the dash near the drivers door just for the link. You can buy a OBD I link that will attach and put the computer into diagnostic mode. Any such link should have a code guide as well. When you attach the jumper and turn the ignition on, the MIL (maintenance indicator light) will begin to flash. You will see breaks in the flashes to distinguish numbers. This will give you the readout of the trouble code. If the system tells you that the vehicle has an O2 sensor problem, simply replace the corresponding sensor. As OBD I only reads system failures and not variations in data, the computer will only trigger a MIL when a sensor fails. Hope this helps.

Posted on May 31, 2010

Testimonial: "This helps alot. Had my teenage son take it to the parts store and all they told him is you need to know where it is and we let you borrow the machine (while you leave them yours driver's license). This helps!"

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