Datsun 1600 HFS3-Help needed

[Richard L]

If you don't mind taking the voltages agian for me. Without those information, it is difficult for me to know where the problem is. (with the engine running of course)

No probs mate, I'll get you those readings tomorrow.

[Richard L]

the most important pins are:

pin #5 ........ injector (+) This must have 12V there to power up the system.
pin #8 ........ injector (-) We retrieve the idc signal from here.

Hi Richard,

I apologise for not replying to your last post. I am in the Navy and had to crash sail. I have only recently returned and picked up where I had left off.

Over the past few weeks I have managed to get my car up and running again. After some modifications to the ECU wiring a few weekend ago, the Aquamist powered up as per the instruction manual. I then dropped the car of to my tuner and it was agreed that he would do the system test of the Aquamist and complete the tune.

This morning my turner rang and said that he was able the get the system to work in the “test” mode but the system does not trigger in the normal working mode when the 40% injector duty cycle trigger point is reached.

I was wondering if you have ever encountered this problem before and what the cause would be. If not would you have any suggestion on where to look for a likely cause to this problem noting the following:
1. The Aquamist inputs are the (+) and (-) supply from the injector as per the instruction manual
2. The system powers up fine and the F-IDC light increases and decreases with engine RPM.
3. Tank level is over ?
4. The system can be manually activated in “test” mode, where it performs as per the instruction manual.
5. My tuner has tried turning the threshold knob all the way anti clock wise and still no spray activation
6. The ecu data logger shows a peak injector duty cycle of 70%

Thanks Richard,

Kind regards,
POMT Orlando Barrett
HMAS Success Manager AAS
Level 3, Building 89/90
Garden Island

orlando.barrett@defence.gov.au
(tel) 02 9359 6167
(mob) 0418 315 466

[Richard L]

Good to know we have moved on a bit further.

To test if the system is reading the F-IDC or not, please do the folllowing:

1. Remnove jumper link "PRK"
2. put it on to "FDC"

Now the gauge will display the F-IDC on the gauge. Please let me know the result.

Hi Richard,

I did as you instructed and there was no change to the gauge other than the little red s disappearing.

[Richard L]

It appears the f-idc (injector-) is not getting into the circuit board

Please check the green wire of the grey connector is wired to the fuel injection(-).

Also check the wire order of the grey harness is as following (from gauge end):
red, green, orange, white, yellow, blue, black and brown.

Hi Richard,
I can confirm that the f-idc (injector-) is wired to the fuel injection(-).

I can also confirm that the wire order of the grey harness is as following (from gauge end):
red, green, orange, white, yellow, blue, black and brown.

[Richard L]

Good.

There are 30 test pins on board. Please read the following voltage on the following pins for me:

Pin 8 (-) ........ raw negative-going pulsed signal from injector
Pin16 .............. processed IDC%

If you blip the throttle the enigne, you should see some voltage change on those pins.

Pin 8 (-) ........ 13.10 - 14.10 volts (as the RMP increased and decreased)

Pin16 ............ 0.06 - 0.24 volts (as the RMP increased and decreased)

Not sure if this helps Richard, but I thought I'd try swapping the red and green wires around just in case. The result was exactly the same readings as above.

I also made a video. The lighting isn't the best but I hope it helps.

http://www.youtube.com/watch?v=9UeddFJE3tM