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no ignition power to ecu 

 

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 Post subject: no ignition power to ecu
Posted: Sat Aug 19, 2017 6:04 pm 
Tyre Shredder
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WA, Australia

Thought id start another thread as the other was going nowhere.
Eb v8 has no ignition power to the ecu,what would cause this?
I was instructed to check fuel pump and ecu relays and wiring with a specific test and it tested ok apparently.
Very confusing because the ecu should be getting power through the relay when ign is on?
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 Post subject: Re: no ignition power to ecu
Posted: Sat Aug 19, 2017 11:31 pm 
Tyre Shredder
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I only have one question right now and that is "what stops ignition power from getting to the ecu?"
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 Post subject: Re: no ignition power to ecu
Posted: Sun Aug 20, 2017 12:12 am 
Fordmods Junkie
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milo 302 wrote:
I only have one question right now and that is "what stops ignition power from getting to the ecu?"



could be faulty wiring, burnt wiring, blown fuse, faulty ignition switch, loose wiring connector .... etc etc.
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 Post subject: Re: no ignition power to ecu
Posted: Sun Aug 20, 2017 1:35 pm 
Tyre Shredder
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WA, Australia

Ive been chasing all those things,fuses are fine,wiring diagrams talk about fusible links but ive only found one so far near the relays and its fine,theres meant to be at least 3-4 near the battery.
If the car still turns over and everything else has ignition power as usual could the ignition switch be faulty,i wouldn't have thought so,its the only thing I haven't looked into.
Where as chasing broken/burnt,exposed wires etc,how longs a piece of string,could take forever which is where im at now :(
The fuel pump relay is working but doesn't click on when acc are turned on,the ecu relay doesn't seem to be working or functioning/doing its job at supplying power to the ecu but it does click on,just doing my head in lol
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 Post subject: Re: no ignition power to ecu
Posted: Tue Aug 29, 2017 3:34 pm 
EFI Guru
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Is there power at the Brown EEC relay?
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