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Engine+electricity stops for a split second when gear put in reverse + Fault P0685

griellwe

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Car
Accord Type-S '04
Hi guys,

yesterday my Accord developed strange issue - when I put it in reverse gear, engine stops running for a split second and after that everything comes back to normal. Also radio turns off and I can hear fuel pump restarting again. It also happens when engine is off but ignition on - same again, radio turns off for a split second and lights on dashboard flashes (in this occasion check engine light)

Check engine light is on and the fault is P0685 - ECM/PCM power relay - circuit open

Last year my mechanic replaced alternator and caused some shortcut cause I have had to replace drivers door control panel as it stopped operating and I couldnt open door. I wonder if it is anything to do with this...

What should I be looking for? WHat could cause it? Car runs ok, all other gears works fine.

Could it be faulty ECU?

Here you can watch how does it look like when I put gear in reverse: https://streamable.com/a4ctr2

Thanks
 
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