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How to Read Trouble Codes on a 1994 Toyota 4 Runner

You can read the trouble codes on your 94 Toyota 4-Runner from your home garage using a computerized handheld device known as an OBD scan tool. This tool can be purchased from your local auto parts retailer. The 4-Runner comes standard with an on-board diagnostics computer (OBD) that receives and stores trouble codes sent to it from sensors positioned throughout the vehicle. These sensors monitor all functions of the vehicle. Once these codes have been detected, the OBD computer illuminates a service or warning light on your instrument panel. You can read the codes yourself so you can pinpoint exactly what repairs need to be done.

Instructions

1

Find the OBD access port just left of the fuse panel cover on the drivers side dashboard. Plug the scan tool into this port, but do not force it in. If you force it, the pins could bend.

2

Put the key into the ignition and turn it to the "On" position, but do not crank the engine. This will power on most OBD scan tools. Note that scan tools vary depending on the manufacturer. Check your scan tools manual for exact instructions.

3

Wait for the scan tool to display "OK." Turn off the vehicle.

4

Press the "Menu" key on your scan tool and scroll through the menu using the arrow keys. Look for the "Stored Codes" option. Select this option. Wait while the scan tool displays the numerical trouble codes. Some scan tools will also display the diagnosis on the display, while others require that you look up the codes in the booklet that came with the scan tool.

5

Unplug the scan tool and have your vehicle repaired by a qualified mechanic.