Sycokid666

This is the wire at d3 is that for a knock sensor and could i wire it at the shock tower ?
does anyone know if I have to ground a the knock sensor when using an ls harness on a 98+ Spec b18c jdm swap in a 93 vx hatch and what wire do I run it to there is a yellow and blue wire in the d3 spot ? And also should I use a shielded wire ? I have searched but haven't really found an answer or pictures of where to wire it up at the shock tower , I'm actually not getting a knock sensor code I'm getting a #4 Cel code is that different for odb2a or is it the same code for ckp , the motor doesn't have a plug for that sensor I'm using the p73 ecu or could it mean something else ?

CX-Adam

You're asking a lot of questions. It's kind of hard to determine what we're trying to resolve. So, let's try and take it step-by-step and break it down.

What year is your LS engine harness?

I went through my 92-95 Civic, 96-98 Integra, and 94-95 Integra Helms manuals last night to try and find an answer for you but I wasn't sure what you're asking. I know you've correctly identified the D3 pinnout being for the Knock Sensor for the P73 (Integra ECU). However, for the VX it's the LAF LABEL pinnout. I THINK there are some differences in how the harnesses (engine/chassis) are wired that you may have to sort out.

From my cursory review, I think grounds for the Integra ECUa and ECU sensors are chained together and grounded at G101 through D22. On the OBDII Integras, the CKF and other sensors (including knock) all have a common ground (through the D22 ECU pinnout to G101).

94 Civic Si

I thought Integra ECU was P72? (Not trying to be a dick).

94 Civic Si

Oh wait, B18C1/GSR is P72...

94 Civic Si

What harness is in place at the ECU? Is it still your '93 VX harness?

Do you have a FSM for '92-'95 Civic?

Sycokid666

I have a 93 vx hatch that I just swapped a 98+ itr jdm b18c im using the p73 ecu that came with the motor , I do have a odb2a jumper harness to run the ecu that came with the motor so it plugs right up to the stock harness inside the car . Upon searching forums all I needed to do was wire up the single knock sensor to d3 , and the single vtec wire to the orange and white wire . Now I hooked up both wires but I also found you could hook them up at the shock tower .. I'm actually not throwing a CEL code for those wires I'm throwing a code #4 so everything I have searched the Internet forums are saying it's a ckp sensor and then some searches are say it's in the distributor or a maybe a loose ground/wiring other searches say to use shielded wire or ground the wires to the block . The engine harness I'm using came off my 99 ls motor im just wandering if my wiring at the shock tower has anything to do with the check engine light or if I should get some pre made wires off eBay or something and take those wires at the shock tower off and go straight to the harness at the ecu plugs ? I'm sorry if I'm all over the place I just have never encountered this issue and the searches really havent helped seems like they always lead to something else

94 Civic Si

You have an OBD2 ECU, with an adapter to fit an OBD1 harness?
And the harness from your '93 VX has been substituted with an '99 (OBD2) LS harness? I am not sure I understand how you are using OBD1 connectors at the ECU with an OBD2 harness.
Sorry, I may be too dumb to add anything useful to your thread...

94eg!

iTrader: (2)

To put the B18C in your chassis, you shouldn't have to add any wires to the ECU. You will need to verify all your wiring connections are correct in the following:
- shock tower (engine harness to chassis harness)
- ECU (chassis harness to adapter harness)
- ECU (adapter harness to ECU)

In order to do this, you need the wiring diagrams that match your Chassis, your engine harness, AND your ECU. When I did a B18C into a 94 CX (OBD1 chipped US ECU with US GSR OBD2 engine harness), I verified all connections. I found the OBD2 GSR engine harness had a weird pin mismatch at the shock tower. Where the US OBD1 used that pin for the EVAP solenoid, US OBD2 used it for the IAB on the GSR. I had to clip off the IAB plug and wire in a EVAP plug and mount my old EVAP solenoid under the manifold. JDM Type-R doesn't have an EVAP solenoid whatsoever, and US OBD2 has it on the firewall (chassis harness). Made the setup a little tricky, but I was sure glad I checked EVERYTHING before installing the motor.

Sycokid666

Sycokid666

And on the ls harness , yeah it's odb2 it's from a 99 ls integra the ls motor I was running in this car before no problems
had a 95 ls ecu odb1 so that plugged right in just figured I could use the harness and wire up the vtec and knock separately

Sycokid666

Ckp sensor but no home on the motor for this sensor
Figured the ecu wouldn't look for it anyways since jdm
B18c doesn't have it

Sycokid666

great point could be what's going on here maybe I snipped the wrong damn wire but the only other wire where I wired the knock sensor is just hanging or the same color wire anyways

Sycokid666

94eg!

iTrader: (2)

The 95 LS motor has the CKP in the distributor. Does anyone know if the 98 JDM R still has the CKP in the distributor too? I know Honda added the CKF sensor on the crank pulley in 98 (for JDM), but that might be "in addition to"...

Sycokid666

I have a 2000 usdm type r I tried swapping the distributors real quick to see if it was the distributor the same code came up ..

94eg!

iTrader: (2)

Verify the connections on your conversion harness. I've seen a thread recently where some pins were in the wrong place on a brand new one.

Sycokid666

Are you kidding me .. Looks like I can't even handle two wires there all the same color too let me see what I can do

CX-Adam

All of the following info is from Katman

.:FFS TechNet : Scenerio 2 : OBD2 Engine into an OBD1 vehicle :.

Sycokid666

Just now I went ahead and took the wire I spliced for the knock at the shock tower and put it back together so now check engine light is gone .. hmm so I guess that d3 wire isn't for knock on this vx hatch . Knock sensor is just hanging there now still not throwing a code but I figure once I drive it , it will eventually pop up .. will see

CX-Adam

Exactly, it's for the LAF (lean burn wide-band o2).

You need to wire the knock directly from the ECU to the sensor as shown in the picture I posted...