Injector Circuit Malfunction
 

After changing out stock injectors for Deatshwerks 700cc injectors for my flex fuel conversion about 4 months ago I just started getting injector Circuit malfunction P0201 code.

When the code comea up I can feel one cylinder is down. Restart the engine and the cylinder is running again and I was able to reproduce this several times.

They came with short wiring adapters to fit the stock harness so plug-n-play install was easy. I was thinking of swapping the adapter cable to another cylinder as a first step to rule out wiring problem, then move the injector to another cylinder and see if the code moves to something other than cylinder 1.


Anyone have any other suggestions?

Is this this correct cylinder arraignment?

front
/\
3--1
4--2
----
rear

Thanks.

I had the same issue with the same injectors. Some dielectric grease in the connectors will probably help but I would try to swap the adapters to see if you can get the problem to move and then file a warranty claim with DW. They are pretty good about getting out new parts and I believe this is a known issue with them.

Any info on the cylinder numbers? I found one post that #1 is passenger side, front but I'm not sure if that was a US spec car.

My ODB-II bluetooth adapter caused mine. Had to disable fast comm.

That is correct.

We have hard adapters available that usually solve this issue. I like the DW injectors, but don't like their pigtail adapters. I usually recommend soldering injectors to get a hard connection.

The hard adaptors we have available are better, but will require you to cut your passenger side heat shield to clear the larger adapter.

Do you have them listed on your site? (couldn't find them) I want to move the pigtail around to confirm it's a wiring issue and not the injector but getting rid of the pigtail all together seems like a solid solution.

No, they're not listed. PM us if you want a set.

Good idea but not this time. Nothing was connected to the port.. But I can relate.... I had a misfire code a few times with my bluethooth adapter connected but never without it. :iono:

Some early cars had sketchy OBD2 ports that didn't connect well, and could cause issues, but you have a 2014, so it shouldn't be an issue.

Low quality electronics can introduce enough noise into the system that you can get odd behavior.

I've seen boosted cars just flat out not run right when cheap aftermarket headlights are installed.

I use the hard adapters as well for the DW700cc injectors. It did require trimming the metal shield that goes over the injectors. So far so good.

UPDATE: I swapped the pigtail from cylinder 1 to the one next to it and reassembled both with dielectric grease.
2 trips and 20 miles and good so far.

Thanks all for the input.

The injector circuit code problem came back. I called DeatschWerks and they acknowledge a design problem with the electrical connector that attaches to the factory harness.
The different style connector is being supplied since my purchase in April 2015. Change in the connector body and longer pins in the grey connector that attaches to the factory connector provides a more reliable electrical contact. Pics below.

My very first thought was: Bigger Injectors probably means bigger coil.
Bigger coil means bigger inductor.
Bigger Inductor means bigger reverse EMF (Electro-Motive-Force) when the ECU tries to turn off the injector.


The ECU will have a reverse EMF diode on the board that absorbs the energy left in the coil when the Injector is turned off.
As the field collapses it sends a big pulse back to the EMF diode.
With a larger coil the reverse EMF is larger and might overwhelm the diode allowing noise into the ECU.


So you could add an additional rev-EMF diode in the harness adapter and it might solve the problem.


So if you are interested in trying that, you would need a suitable diode, and solder it into the connector such that it does NOT conduct when the injector is firing.