I have a Haltech Elite 1000 in my FB with an S5 NA engine and am trying to get an OMP working. I wired it in and am not seeing any movement on the OMP at all regardless of settings changes, target position etc. It's currently just hanging by the fender until I confirm it's working so it's not actually moving oil yet. I still expected the motor to move a little though.

I wired the OMP as a 4 wire stepper which seems to be the recommendation on the forum here, so I eliminated both 12v feeds to the OMP.

Wiring (OMP harness || Haltech Harness):
3 wire harness:
Black || black/white (ground)
Yellow || Yellow (signal - AV9)
Blue || Orange (5v)

6 wire harness:
Blue || Green (P1)
White || Green/black (p2)
Black || Green/brown (p3)
Yellow || Green/red (p4)
The remaining two red wires are not connected.

In the nexus software I think I have it configured correctly:



The OMP itself is a part I got used and has not been directly tested by me, but it does pass the resistance tests from the service manual as outlined here: https://www.rx7club.com/2nd-generati...2/#post7628548

What am I doing wrong here?

 

Change drive type to both.

 

Ok I changed the drive type to both for all 4 pins. Unfortunately I still see no movement. I can move the pump by hand and I always see 4.57v on AV9 "feedback input". The Haltech diagnostics show the OMP in a stopped state, 100% current position, and 0% target position no matter what changes I make to the target position table. Is that AV9 reading expected? Based on the diagnostic output I feel like I have something configured wrong still

 

I'm not a Haltech guy, so I could be wrong, but if your Haltech is trying to drive the OMP stepper motor the same way that the OEM ECU does, and how my Link G4+ does it, removing those two 12V feed wires could be your problem. The OEM ECU (and my Link ECU) drives the OMP stepper in a unipolar mode - each coil (arranged in pairs) gets a common switched +12VDC supply, and the ECU completes each coil circuit to ground whenever that stepper coil is supposed to be energized.

 

active state needs to be high.

Oil Pump Wiring (haltech.com)

 

Haltech does not work this way. 12V+ needs to be removed.

 

I got everything installed and can see oil visibly moving through the lines. I did fix the active state setting, however the sensor always shows just under 5v on AV9, and the position sits at 'closed' in the nexus software. No amount of revving or directly changing the OMP position table makes this change.

I took the sensor part off the OMP and pushed the plunger in by hand and saw the voltage swing, so I know that is working. I just want to make sure the OMP is working as expected and the lack of any movement in these readings makes me worried. Any other troubleshooting I can do to ensure it's working? Or can anyone tell me more about what I should expect to see in the ECM?

 

I'm also having issues with my OMP. I keep getting an error, most recently "low flow", whatever that means exactly.

When the harness was installed, the 2x yellow/black wires were de-pinned. With that, all active states are set to high, drive types are both.
I am debating re-pinning the two yellow/black power wires and I believe everything will be set Low/Low side

 

Do most people have the 2x power wires de-pinned with such haltech settings? This is a rywire harness
Really struggling to get my OMP functioning properly

 

The 12V connections need to be removed when used with a Haltech. Rywire should know this and shouldn’t be building their harnesses with the 12V.

 

Thanks for confirming, I really was not sure
Can you confirm my haltech settings are correct with the 12v's removed? If so I will ignore the low voltage error.

 

Sounds like you need to calibrate the sensor. Force the pump to 0%, record the sensor voltage and set it as the 0% level. Force the pump to 100%, record the voltage, and set it as the 100% level. If you need help, I can remote in and set it. The settings are going to be different for every combo.

 

I'm still trying to get my own OMP working and realized this weekend that at idle I have a lot of blue smoke coming out the back. Like a LOT. I've owned RX7s for years and this is more than normal.

My Haltech keeps reading a target position of 0% and actual position of 100% and I think it might actually be right. Maybe the OMP is stuck 100% open? I figured I had a wiring issue or something but I now think I should rebuild the OMP and see if I can unstick it. I know the sensor works because I can take it off and push it by hand and see accurate values in the nexus software.

Thoughts? Or any advice on rebuilding it?

 

If you’d like, I can remote in and see what you have going on. Email me if you’d like. chris@lms-efi.com

 

I think I mostly figured this out. The OMP seemed to get stuck and not want to close because it was full of crud. I took it apart, rebuilt it, and got it to open and close as expected. It was definitely having trouble closing on its own (a spring is supposed to push it back). I could test it by plugging in the pump with the sensor taken off, so I could push the sensor and see the OMP actually move forward and backwards as it moved towards its target position. I was also burning a lot of oil with 1oz of premix per gallon on top of an OMP stuck at 100% open!

The only issue now is that the position never drops below about 20%. AV9 sits around 1.5v at the lowest, but by default Haltech had the low voltage set to 0.89v for the low side. Is it ok to just update my low voltage to be a higher value, or does this indicate there is still something wrong with my OMP?

Testing video:

Low voltage/closed position issue:

 

You need to change the voltage settings to match the pump.

 

Hey Chris,

To do this, the pump has to be removed so you can physically see the position?