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Fuse #34 for fuel injectors and PCM power keeps blowing

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Posted on Jan 02, 2017

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SOURCE: E.E.C fuse keeps blowing in 1991 Ford Explorer

if you replaced fuel pump i would look at backward wiring when replaced and i would start at the source of work if your vehicle was working fine before replacement then 9 out of 10 it will be your fuel pump wireing

sometimes when putting wireing back together the connectors have the missing clip and in turn you can turn the wireing in both directions now where positive is touching the ground on both sides of connector kris kross problem check your work this is crucial use a test light to find the right wires where they go

Posted on May 26, 2008

  • 55 Answers

SOURCE: pcm fuse keeps blowing and van won't run

sounds like dead short....would look at wire diagrahm to see what ground is hitting a hot wire...maybe alternator,starter, fuse block....ect....

Posted on Jun 25, 2010

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SOURCE: 1998 Ford Sindstar PCM fuse keeps blowing

check the relay of ur ford

Posted on Jan 25, 2011

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SOURCE: Fuel pump is working and

Try to follow wiring from fuse panel to relays etc and back to pump while looking for bad, loose, soft, thin or corroded connections along the way and clean or repair them as necessary to be sure you have a good clean source for current to flow. Any of these in wiring can cause amperage draw to go up, thus causing the fuse to blow. If all that checked out good, then the probable cause is the fuel pump getting worn and drawing too much amperage thus replacement is necessary. If you have a trusted mechanic in the area who can do an amp draw test on the fuel pump wiring harness, that should tell you for sure.

Posted on Jan 29, 2011

  • 1567 Answers

SOURCE: i have a 1997 ford

You probably have a shorted fuel injector coil or driver transistor. To find the problem, you need an ohmmeter (digital multimeter set to 200 Ohm scale). This test procedure is done with the car shut off.

Remove the connector from one of the fuel injectors. Measure the resistance between the two terminals and write it down. Next, hold the black (common) test lead of the ohmmeter to a nice, clean ground spot (anywhere on the engine is OK) and push the red (+) lead of the ohmmeter into one of the sockets on the injector connector. Repeat with the other socket. Both should read very large or open values. If you get a reading under 1 Ohm on the connector, you have a shorted driver transistor and the ECM will have to be repaired or replaced.

Plug the injector connector back in, and repeat the test with the next injector. If you find an injector with a coil resistance much less than the others, that injector has a short in the coil and it must be replaced. The readings should be within 5% of each other.

If your car has throttle body injection (only one injector), the coil resistance should probably be about 10 to 20 Ohms. I suggest calling the service department at the local Ford dealer and asking what the fuel injector coil resistance is supposed to be.

Do not be surprised if you find the driver transistor is shorted and the coil is also shorted or burned out; if one part goes bad there is a good chance it will ruin the other (a shorted transistor will keep the injector on all the time and overheat the coil; a short in the coil will allow too much current in the transistor and overheat it. If you are having a "not-so-bad" day, the fuses blew quickly enough to prevent the double failure.

Posted on Mar 22, 2011

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Fuse #23 will be the pump fuse, you should have 50 psi of pressure at the fuel rail.
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Troubleshooting wiring can be a difficult task when your doing it much less telling someone else to. If your blowing a fuse you need to find out what that fuse runs. The best bet would be to get a book on the vehicle and see what circuit is blowing.

You will want to start by looking for wires that are burnt or touching the exhuast. They dont even have to be on the same circuit for it to matter. As an example if the o2 sensor wire on a v6 f150 burns on the exhuast it will blow the transmission fuse and sometimes the pcm fuse.

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