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I just had the ground wire on the ecu burned how do i run another ground wire to it and did it mess anything else up

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To ground old wiring, verify that the electrical box has ground access by placing one lead of the lamp tester in the small (hot) outlet hole and the other lead in the neutral hole. More here:
ford vcm

Posted on Jan 09, 2013


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90 k5 blazer i dont have any power at map sensor, throttle position sensor, and the injectors will not fire. i have preasure but no injector fire. could anything in the column cause this

can you check to see if the ecu is getting power. i dont have the wiring code to hand, but remove the battery and unplug the ecu. then put battery back on and turn ignition on, with a meter or a 12 volt bulb with a wire conect to earth and the other end to connections on the ecu plug you should get 4 or 5 lives. if that all works try the ground wires to the shell follow the ground wire from the battery to the shell check and clean these.

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Tachometer not working on my 95 Toyota pickup 4x4 jumping up and down

bad tach, seems .
bad tach, or bad wires to it or power to it bad.
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I have an 89 ford ranger that i cant get the fuel pump to run. i jumperd after the relay and from after the relay the pump runs. i cant get tghe relay to work at all and i even put a new one on.

Hi, if the car runs with the jumper wire, maybe the wire from the ECU is bad. The pump is powered by the 30 amp fuse #1 in the box under the hood. The relay coil is powered by the EEC power relay, and receives it's ground connection from the ECU. If fuse 1 is good, odds are the relay is not getting the ground signal. You can verify this by connecting a test light to the positive battery terminal and probing the relay socket. The pump terminal will dimly light the test light, and when the key is on the ground signal from the ECU should make the light bright. If you don't get this light, either the ECU is not turning the pump on, or the wire from the ECU is bad. Going back to my first question--does the car run with the jumper? If yes, I would guess the wire is bad. If no, I would say there is a reason the ECU is not trying to turn on the pump--like maybe a security system or safety interlock. An easy way to force the relay to come on is to cut the tan/light green wire from the ECU and ground the side that goes to the relay. The pump will run when the key is on, but the ECU will noit be able to shut it off. Please let me know if you have questions.


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97subaru impreza outback sport wagon 2.2 1234 misfire replaced plugs ,wires, coil pack, fuel filter added injector cleaner check engine light blinking with no code.what do you think i should do next?

check you ecu. same problem happen to me in an izuzu rodeo. I let my fuel get to low and it sucked dirt into the filter and messed with that and it set off a code for the ecu and messed it up but if i had just replaced the ecu first i wouldnt have had to change the injectors or anything.

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Ford focus 1.8 diesel. 2001. ELECTRICAL.. lights, brake lights, windows, blower wont work. checked relays and fuses. there was a prob with starter motor solinide.. caused negative wire on battery to get...

The ECU doesn't have anything to do with lights, windows or blower on your vehicle. Fuse or burned ground wire in those circuits if far more likely. Get a wiring diagram and find the common /fuseswires to those circuits.

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I have a 2002 Kia ECU system fuse burning all the time

Assuming the correct fuse is being used, there is a short somewhere in the wiring leading to the ECU or in the ECU itself. If no modification has been done to the wiring (such as aftermarket radio or alarm), the ECU may be bad. A dealership may be able to test the ECU if you remove it, but will probably charge for the service. You may be able to find a cheap ECU at a junkyard for the same cost. You can use an ammeter to check power consumption at the fuse slot. If there is more than rated amperage consumption with the key on, engine off and ECU in, there is a short. Remove the ECU and recheck. If there is more than about a hundred milliamps with the ECU out, the short is in wiring. If not, the short is in the ECU. If there has been modification to the wiring, check it for shorts or exposed wires, and remove the mods if possible. You may also be able to get a pinout for the ECU from Kia and check for incorrect shorts to ground on each pin using a self-powered continuity tester.

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1994 Jeep 4.0 litre. Vehicle does not activate fuel pump when ignition is turned on. I turned ignition on for 1 minute, and the relays chattered after 1 minute. Once the system activates the relays, the...

this one's tricky. you have to drop the fuel tank and clean the grounds for the fuel pump (such a mess to do) and make sure that the ecu and battery are properly grounded, as well as cleaned. if the problem persists, you may have wiring damage to the fuel pump or the ecu could just be freaking out.

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