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Ask Juan Crespo Your Own Question
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: VW
Satisfied Customers: 1515
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Want to know where relay is or how to fix po685

Customer Question

Want to know where relay is or how to fix po685
Submitted: 9 months ago.
Category: VW
Expert:  Kevin replied 9 months ago.

hi im kevin there is a fuse box under bonnet its relay 2 in picture that needs to be replaced

Expert:  Kevin replied 9 months ago.

Please let me know if you need anything else and remember to rate my service

Customer: replied 9 months ago.
Sorry but relay never mad a diffrent I'm lost! I have no spark is that what relay does?
Expert:  Kevin replied 9 months ago.

The relay powers up ecm have you checked fuses?

Customer: replied 9 months ago.
all fuses are good! There is power at relay! This doesn't make sense! I have fuel ! No spark took coil pack out of hole put spark plug in nothing!
Customer: replied 9 months ago.
This car maybe has a bad crank sensor and this is a false code?
Expert:  Kevin replied 9 months ago.

My info system is down i would expect two terminals to have power with ignition on for relay to work il get back to you once ive got wiring diagram up

Customer: replied 9 months ago.
Do not have power in two places! Just one
Customer: replied 9 months ago.
It was not crank sensor
Expert:  Kevin replied 9 months ago.

I can find diagram il opt out as another tech may have this but the input missing from relay is your issue but without diagram i dont know where it comes from

Expert:  Juan Crespo replied 9 months ago.

Unplug the relay and check for power at socket terminals 30/1 and 86/3. If only 30/1 has power, there is an open circuit in the relay panel - you could temporarily bridge the terminals, then plug the relay back in and see if the engine starts.