Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

Were you having problem making the manual test work? I couldn't quite understand you last post.

Assuming you meant you "can't" make it work... a few questions:
1. Did the pump come on when you when you link the "SYS"
2. Did all the led lights up when "SYS" is linked

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

The IDC reading is good from the video. We can now focus on the delivery.

One thing you might like to check... there is a thin blue and red wire going into the pump relay assembly, make sure it is not detached.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

Sorry I didn't make that clear. What I meant was, could you explains what's the manual SYS test is. I'm not familiar with that.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

OK, "SYS" is a link on the controller that actives the system manually. Turning the pump and FAV on. Make sure the engine is running and only do it for a second of two.

Download this HFS4-v2 manual so that you know the system better.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

I did the SYS test and the pump worked for the 1-2 seconds I placed the jumper there. I put the DHB back and went for a drive. Again, same thing is happening. Failsafe activates and pump stops in no time.

I've also checked the two thin wires you mentioned. They are in place and no sign of them being lose.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

This is very strange.

Unplug the FAV harness so not water is injected. SYS again, tell me if the pump can now run for several seconds without cutting off.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

any updates?

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

Hey Richard,

I was away for the last few days. Just came back home from work.

I tried it and the pump kept on working for as long as I keep the the jumper on SYS. I now have bigger hope that you will figure out the issue so soon.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

OK, the controller and pump circuity is working as it should. is it possible to watch led on the controller as you drive? I like to know of the amber led stays lit after triggering.

Re: Pump starts then stops within a second. MKVI GTI - HFS-4
 

I'll do that and try to locate the controller in a place where I can clearly see the Amber LED. What would that indicate? I mean if the Amber LED worked or not?