No flow reading from water injection!

[torquemaniac]

Hi all,

My HFS4-v2 has been running superbly since the install (about a month), then two weeks ago the bargraph jumped to 8 bars on a WOT run (usualy doesnt go over 6 bars)

After this event, the bargraph never lit again and the failsafe (disable high boost) keeps trigerring when the injection should usualy start

Here are the system diagnosis I did :

- checked the f-IDC led on the controller : led is flickering normaly
- tested the spray on the windshield with the FAV and SYS jumper : its spraying like it should, but no bars are illuminating on the gauge
- tested the gauge bargraph with the FDC jumper : the bargraph works perfectly (shows the f-IDC of the engine while driving)
- checked the flow sensing unit connector, harness and sensing head : everything looks good
- disassembled the flow sensor turbine : everything is fine...not clogged
- used a magnet near the flow sensing head : no effect on the bargraph

When the car is started, the gauge goes through the usual system-on procedure (tank level led illuminate for few seconds, then is turn off when the water injection and S led illuminate)

The system seems to spray somewhat even with the failsafe triggering because the tank empty slowly (the tank is not leaking...)

Is there a way to test if its the flow sensing unit or the controller that is the problem?