No flow reading from water injection!
 

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?

Re: No flow reading from water injection!
 

It appeared you have done all the right tests so far.

Two more tests for you.

1. remove the flow body from the FAV, blow into the one end, do you hear a whirling sound?

2. If you do, chip on the sensor cable and tell me if you see and bars on the gauge as you blow.

1. No sound = the turbine wheel is jammed.
2. No bar display = the sensor cable is faulty

Re: No flow reading from water injection!
 

Hi Richard,

I will do the turbine test, but when I reassembled the turbine after inspection, I could hear a small ''clac...clac...clac'' when the FAV assembly was shaken...meaning that the trubine was not jammed but loose to move a little

Is there an easy way effectively test the flow sensor head (clip) with a magnet (I read somewhere that false flow reading could come from electromagnetic disturbance near the FAV assembly...I then guess that this could be used to test the flow sensor head)!?

Is there a way to test the sensor cable with a multimeter (example : by checking the Ohm reading)?

If the cable is faulty, where do you think the problem is most likely to be (connector, sensor head...)?

Thanks

Eric

Re: No flow reading from water injection!
 

You need a cyclic change of magnetic polarity. Your best bet is using the turbine body. Just keeps blowing with the sensor cable clipped on.

Richard

Re: No flow reading from water injection!
 

Richard,

I did the test and there is a turbine-like sound, but the bargraph is not illuminating even blowing 100psi air in the turbine...

I redid the test with the nozzle spraying on the windshield, and its spraying good but not bar on the gauge again

Anything else I can test?

What wire can I test for continuity on the yellow harness with a multimeter (at the connector)?

Can the controller be tested with the test points on the board6

I really want to eliminate all possibilities before buying new stuff and having to pass more wire though the damn grommet...

Re: No flow reading from water injection!
 

Richard,

I tested the yellow harness wire with a cheap multimeter on the connector pins (harness unpluged from the controller)...here are the results :

Black+ and Blue- = about 1 Ohm
Blue+ and Black- = about 1 Ohm
Black+ and Red- = about 30 Ohm
Red+ and Black- = about 300 Ohm
Blue+ and Red- = about 30 Ohm
Red+ and Blue- = about 500 Ohm
Yellow+ and Black- = about 4 Ohm

Does this make any sense to you!?

Could I plug my old HFS-3 controller and make the windshield spray test to see if the bars on the gauge illuminate?

Re: No flow reading from water injection!
 

Richard,

Can you give some feedback...please!!!

Re: No flow reading from water injection!
 

I think the sensor cable is faulty.
What is the serial number of the controller? The HFS4 version 2 is at least two years old.

If you put 100psi compressed air thought the sensor tube, it will melt the bearings for good.

Re: No flow reading from water injection!
 

You sold me the HFS4 v.2 controller on february 2014 (SN121472)

Are you asking for the warranty?

If you say the sensor cable is faulty, I will just buy a new one...

The compressed air was used for just an instant (the turbine spin pretty easily)

Re: No flow reading from water injection!
 

You bought it in 2014 and only just installed it recently? I was confused why you have a HFS4-v2 (up to March 2014) instead of a HFS4-v3.11 (July 2015)

What car do you have?

It all pointed towards the sensor cable from your description.