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Hi all, MK2 with a 1.4 Petrol engine stopped with fault codes P0686 Main Relay short to ground, & P0562 System power supply Voltage to low, my question is, can anyone on Focus Fanatics tell me How do I fix these problem, thanks in advance. Cheers
 

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Hi - I also have this issue - Getting Engine system fault on dash. Will turn over but wont fire up. when I turn the ignition to start, I hear a set of clicking from the fuel relay in the passenger fuse box. Connected up my Ford obd FORscan and it gives me codes - P060c - P0562 - P0686 - P0628 - P2119 Also U2510-20 I cannot figure out WTF the issue is. I've checked every ground, put a known good battery in and still it wont start. Anyone got idea's???
 

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here is what to check:

Defective battery cables or cable ends
Dead battery
Defective circuits
Defective PCM relay
Malfunctioning PCM
Damaged or defective electrical components in the PCM, such as fuses, wires, and connectors
 
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