Help with HFS-3 and MPS Trigger

[naviuk]

Originally Posted by naviuk

Hi Richard

Great, will do, I will have results for you tonight. Thanks again for helping.

I was reading one of the other posts on the bar graph test, from my understanding i should see all bars light up. i only see about 3 or 4, will confirm later. do i need to adjust the SC within the test to see more?

Thanks!

Hi Richard

Right did some testing tonight and making progress!

On initial testing I was seeing 5v pre and post crank, this explains the system triggering no matter what.

On testing the pins on the sensor again and doing some tracing etc I found the signal wire. pulled the ECU, redid the wiring and tested again. Now I see 2.26v (assuming 0.01bar) on pre crank and 1.26 on idle (-0.07bar)

I set the unit just past half way which seems to be just above 0.01bar. The pump still activates with no water coming through but i'm assuming this is because MPS is purely a trigger and the FAV is activated by IDC signal.

I also tested the Bar graph again. on connecting the jumper i see 4 bars but by turning up the SC dial on the gauge I can see all bars. so assuming this is all ok and working. I tested the FIDC again and still same, the "s" disappears while this is on the then comes back online when you remove the jumper.

I put in the 1mm nozzle and headed out for some testing. here is where I get confused... :/

When I reach the trigger point the unit seems to activate, I see water on the windscreen. The "B" comes on for a second or two and then disappears... i'm only running on actuator till I get this right (0.8bar) the W.injection light comes on and then the water level light comes on... I thought maybe the tank is getting empty, I filled it up, being a 7L tank. it won't run out fast...

I tried setting the SC values as well as the WL and WH values to all extremes as well as setting the gain to high and low, no difference on the gauge... I never see any bars coming on. Could this be because i'm using 1000cc injectors. they are the stock injectors 580's de-capped, flow was tested at 1078cc...

my other thought is the unit is going into some kind of failsafe, but the one reassuring thing is no matter what, the water still flows, so FAV and pump are activated and working... the gain just changed the flow from low to high...

I'm slowly getting there... thanks for pointing me in the right direction.

EDIT* on speaking to the guy that did the wiring... he says he only checked continuity for the injector wires, not which is positive and which is negative.... IF these were the wrong way round. could this cause the issues I am seeing? I only found this out now, so can test again tomorrow.

Thanks!
Pierre