Eec relay grounding problem - 1995 Ford Taurus

Find another relay with an identical part number(maybe the fuel pump relay)& swap it in place of the suspect EEC relay.See if the buzzing quits.If it does,the EEC relay is bad.There might be a ac WOT cutout relay or fan relay with an identical part number that you can use instead of the fuel pump relay.The fuel pump relay & EEC relay will both have to be in place in order for the engine to start.A relay should click when you turn the key on,but it shouldn't make a buzzing noise.BTW-the EEC relay is energized when you turn the key on and then it supplies ignition on power to the computer,injectors,solenoids and fuel pump relay.Therefore, if the EEC relay is defective, these components are Not going to work.If you don't hear the fuel pump prime when the key is first turned on,that's a sign the EEC relay is bad.One of the injector wires should have battery voltage, if the EEC relay is powering up.If your vehicle doesn't have a matching relay to the EEC relay(except for the fuel pump relay)just pull the FP relay out and slide it into place of the suspect EEC relay for testing purposes.If the buzzing noise stops,then replace the relay because there's no way to test if the car will start without having both relays in place.

Put power and ground to the outer small pins, It should click. When it clicks you should have continuity between the bigger pins. Check it with an ohm meter. No clicking, bad relay. It doesn't matter which way you hook up power and ground.

I think you are right if the eec relay was bad you would lose your positive power to all the injectors. have you checked all valves to see if they have positive voltage? the power train control module gives the ground to injectors does 1 and 4 work . check your circuit back to control module. check connectors and harness.

I'm not positive the wiring is the same for trucks and vans, but you should have a yellow wire for both relays that go to a fuseable link off the starter solenoid. The key switch powers the EEC relay on, and the computer grounds the fuel pump relay on.
You may want to check the fuseable links and power coming from the key switch.

Is it a 4 cyl or V6 - and you are talking about the EEC relay right ?

Both the fuel pump relay and EEC relay are grounded by the computer. The fuel pump relay magnet is powered by the same red wire the injectors are powered by coming from the EEC relay.
The actual power circuits for each relay comes from different fuseable links.
You would need to find out if the relays are being grounded by the computer with the key on, and if they are sending power out.
You might also want to check to see if you get a check engine light when you turn the key on to see if the computer is powered up.

I suggest to check underhood engine bay, according with this wiring diagram, look under EEC (Electronic Engine Control 1992) or PCM (Powertrain Contro Module 1996-1996)...



Fig. 22: Engine wiring - 1992-95 F-Series 7.5L (VIN G), 1996 F-Series 7.5L Federal (VIN G) and 1996 F-Series Pick-up 5.8L (VIN H over 8500 GVW) engines - ZOOM LINK DIAGRAM HERE (top left)


ALso, I suggest to check wiring circuit C185, located in THIS LINK DIAGRAM (top right)

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check for faulty ground circuits . bad grounds can cause an overheating problem in the relays and other components.

check fuel pump ground wire for clean wire to frame contact also check fuse and relay, jump power across relay to force voltage to the pump with pump relay out.

there is no per se fuel relay. it has a ccrm. constant control relay module, its located near the air cleaner box. I presume this is for a no start condition.

EEC is in control