![]() You still need that wire to ground out the STI. When the fuel pumps stop be r eady to count! If you are a lost soul that does not have a working engine light, or did not install a light into your dash don t fret. You will hear some relays engage and the fuel pumps prime the system. Try to keep your self from getting distracted from here on. ![]() Get a length of wire that can connect the STI to the negative battery terminal or body ground. ![]() If your EEC is wi red correctly, the engine light works, and there are not any electrical faults in the vehicle you can get the codes out of your EEC. To check for codes without buying a code reader is simple. The self-test plugs were mounted on the passenger side fender fender on 1985-86 EFI trucks. The self-test self-test plugs plugs are located located along along the driver driver s side fender fender behind behind the air filter box on 1987-95 EFI trucks. The self-test plugs are located along the driver driver s side fende fenderr by the firewall firewall on on 1986-95 1986-95 Mustangs Mustangs. The other is a smaller single pin plug it is called the Self-Test Input (STI). One is triangular and has 6 pins it is called the Self-Test plug. First you need to find the self-test plugs to read read codes from the EEC. #K621 ford engine codes list how toHow To Run a Self-Test Don’t worry if the Check Engine Light is not on, the computer will store lesser important codes without flashing lights i n your face. Ford Fuel Injection » How To Run a Self-Test
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