You can check the trouble codes for your '94 Ford Escort LX without the use of a code scanner. The '94 Ford Escort LX comes equipped with the first generation On-Board Diagnostics (OBD) computer. This computer receives and stores trouble codes sent to it from sensors positioned throughout the vehicle. These trouble codes are sent when the sensors detect a malfunction in the Escort. You should always read the codes first to diagnose the trouble, then fix the vehicle before resetting the OBD computer. The computer communicates with you via warning and service lights that appear on the instrument panel. If you ignore these lights you may risk further damage to your Ford.
Put the key into the ignition and turn it to the "on" position but don't start the engine. Pop open the hood and prop it up with the safety bar.
Find the six-pin receptor Self-Test Output (STO). Next to that output is the small, one-receptor Self-Test Input (STI).
Examine the STO and find the two outlets on the bottom. The outlet on the left, as you are facing it, is the ground outlet. Use the jumper wire to connect this ground outlet to the STI.
Sit in the driver's seat and turn the key to the "Run" position. Watch the instrument panel while the "Check Engine" light flashes and count the number of flashes. This is the first number in the code. Write it down on a piece of paper. There will be a couple of second pause then the "Check Engine" light will flash again. Count the number of times it flashes. This is the second digit in the code. Write down this number. If there are more codes to follow, they will be separated by a four-second pause.
Look up the meaning of the codes in any 1994 Ford Escort LX repair manual.
