[espjr99]

If you could pins I don't see a 12v signal on pin 12 is empty

 

[espjr99]

Conversion harness has power but engine side no

 

[Lotus]

do we see the engine harness side or the conversion harness side?

The C101 in the doctronic pdf is mirrored vs your image.
top row is top row, but you count right to left.
so blue/white would be C101 pin 1 in your picture.
Pin 20 would be the thin yellow wire
Pin 7 the thicker red/white.

Now please check if the yellow wire is connected to one of the 3 pins of the ignition coil connector.
I guess not. I would not be surprised if the red/white is.
If yes, then you also have a harness with 7 and 20 swapped.

 

[espjr99]

GOT IT TO RUN THIS WAS MY PROBLEM

 

[espjr99]

7 and 20 I swapped and it starts now appreciate it bro💪💪

 

[Stefanzoh]

do we see the engine harness side or the conversion harness side?

The C101 in the doctronic pdf is mirrored vs your image.
top row is top row, but you count right to left.
so blue/white would be C101 pin 1 in your picture.
Pin 20 would be the thin yellow wire
Pin 7 the thicker red/white.

Now please check if the yellow wire is connected to one of the 3 pins of the ignition coil connector.
I guess not. I would not be surprised if the red/white is.
If yes, then you also have a harness with 7 and 20 swapped.

I commend you for your patience brother
Glad the guy got it running

 

[taynguyen146]

Hi can i message you personally to ask about what wires i should repin for my harness. I can't seem to post pics on this thread for some odd reason. Thanks.

 

[taynguyen146]

IMG-3921.jpg

drive.google.com

 

[taynguyen146]

IMG-3922.jpg

drive.google.com

 

[Lotus]

C101 7 with 20

 

[taynguyen146]

Does the colors on your engine harness look similar to mine? Would my pin 1 be the pink wire and my pin 20 be the white wire?

 

[Lotus]

If you look at the picture in posting #40,
The conversion harness side, 7 and 20 are swapped.
Yellow and red

 

[taynguyen146]

ill double check everything. this conversion harness should work with the 02 to 04 rsx harness but then again this engine harness isn't oem. hopefully its just as simple as swapping those two connectors for me. btw its a ebay tucked harness with a mitch auto parts conversion harness for a kswap mr2 spyder.

 

[taynguyen146]

It worked! swapping pin 7 and 20 on the engine harness fixed it. Thanks so much!

 

[Lotus]

Awesome
Please share more of your conversion. It might help others.

 

[j5983899]

Can I is it the plug socket what colors I need to know ECT is and have no spark

Shout out to @Lotus for helping guide me!
EDIT: Also I wanted to add, we are still using this harness with little problems. I ended up cutting and soldering in a factory connector to the crank sensor CKP and throttle pos sensor TPS. The connectors that come with this harness are junk and allow a break in contact intermittently because they fit loose causing insane stuttering/misfiring for the CKP and a bunch of throttle problems for the TPS. For others, this could affect other sensors, so it's up to you to figure if each connector is snug and monitor all data streams to make sure everything is functioning correctly, all the time. Keep this in mind if you do buy this harness, some do not have junkyards nearby.
If you have one of those eBay / china tucked harnesses and are not getting spark and or your radiator fan turns on after cranking then you need to swap pins 7 and 20 at the C101 connector. I also recommend buying a quality solid ground lug for 16ga wire with a 5/16 hole and replacing the ring terminal on the harness.
View attachment 110674

Shout out to @Lotus for helping guide me!
EDIT: Also I wanted to add, we are still using this harness with little problems. I ended up cutting and soldering in a factory connector to the crank sensor CKP and throttle pos sensor TPS. The connectors that come with this harness are junk and allow a break in contact intermittently because they fit loose causing insane stuttering/misfiring for the CKP and a bunch of throttle problems for the TPS. For others, this could affect other sensors, so it's up to you to figure if each connector is snug and monitor all data streams to make sure everything is functioning correctly, all the time. Keep this in mind if you do buy this harness, some do not have junkyards nearby.
If you have one of those eBay / china tucked harnesses and are not getting spark and or your radiator fan turns on after cranking then you need to swap pins 7 and 20 at the C101 connector. I also recommend buying a quality solid ground lug for 16ga wire with a 5/16 hole and replacing the ring terminal on the harness.
View attachment 110674

how to connect the VTEC pressure sensor cause the no plug for on the harness.

 

[taynguyen146]

how to connect the VTEC pressure sensor cause the no plug for on the harness.

you dont need it apparently

am i missing a plug on my harness???

so i think i got screwed on my engine harness, but didnt figure it out til now:mad: i spent many hours re-looming my engine harness only to realize i had no plug for the vtec oil pressure sensor:(. here is a pic for reference that blue sensor is something i need correct? is there anything i...

www.k20a.org

 

[espjr99]

I have a question do you have to swap the 7 pin and 20 pin on the engine harness side, or on the conversion harness side c101?

 

[Lotus]

Conversion harness

 

[haxep3]

Hey there all! Looking to add a bit of extra context to this thread, as well as ask a question.

First, my backstory:

I found this exact same issue on an aftermarket eBay harness that I picked up for my EP3 Civic. The eBay listing name was "Tucked Engine Harness For Honda Acura Civic EP3 (Type S or K24 Swap) 01-05", and the harness was $70 USD shipped (yee-ouch, too cheap for comfort lol). In my application, I'm using the harness with a 2003 Honda Civic Si (EP3), and the stock K20A3 motor. For the ECU, it's running the stock ECU with a K-Pro V4 installed.

Just like with the swap harnesses mentioned in this thread, my harness had pins 7 and 20 swapped on the C101 connector, causing the engine to not get spark since the coil packs weren't receiving power. I was able to quickly verify this by checking continuity between one of the coil pack connectors and pins 7 and 20 on C101, confirming the pins were in the wrong locations.

I couldn't manage to de-pin my harness (lack of skill, plus crappy connector maybe) so I ended up cutting, swapping, and soldering the wires (on the conversion harness side of things), which seems to have worked perfectly. So for that issue, thank you for making this thread! You saved me all sorts of headaches.

That being said, I'm now running into a new and different issue. The car will start for around 30 seconds, and then RPM will dip like crazy, voltage will dip to ~9V (or less), the gauge cluster needles will start jumping around (for example, MPH jumping up) and I'll get DTCs regarding intermittent TPM, CMP, and sometimes CKP.

I've already confirmed that the TDC and CMP connectors aren't swapped (TDC monitors the exhaust cam, and CMP monitors the intake cam - even though it's labeled "CPS" on this swap harness). Additionally, I've confirmed that all three connectors (TDC, CMP, and CKP) are receiving battery voltage on one pin, 5V (reference voltage) from the ECU on one pin, and ground on one pin.

As such, the only thing I can think is that this is the weird intermittent loose connector issue that OP was talking about:

Also I wanted to add, we are still using this harness with little problems. I ended up cutting and soldering in a factory connector to the crank sensor CKP and throttle pos sensor TPS. The connectors that come with this harness are junk and allow a break in contact because they fit loose causing insane stuttering/misfiring for the CKP and a bunch of throttle problems for the TPS. Keep this in mind if you do buy this harness.

@Stefanzoh, after chopping off the crappy connectors and swapping them with factory connectors, was your issue solved long-term?

I'm a little worried that if I start chopping connectors off and soldering on known-good factory ones, I'm going to be chasing ghosts with this harness until I've cut off and replaced every single connector on it, and have a hacked-together soldered and heatshrunk mess... For example, Stefanzoh mentioned having TPS issues, but I haven't had any (yet). But it sounds like that could be an issue I'll be dealing with soon...

At what point is it better to scrap the eBay harness and just pick up something like a Rywire?