OK maybe you guys can help...otherwise Im just gonna wire it up and see what happens...

I swapped in a different cluster because the cluster that came with the car did not have a tach. I think its a EX auto cluster with tach. All the connectors plugged right in and the tach worked fine when this motor/engine harness was in my ITR.

I know the distributor wire is blue for the tach signal, and is supposed to route to the driver side shock tower plug. I see the wire on the distro, but dont see it at the shock tower?? Any suggestions on the easiest way to solve this? I dont care if I have to route wires or anything, just want the tach to work.

also note, the cruise control light is on as well. And after looking at the 92 civic distributor schematic, it looks like the blue distributor wire is used for cruise control as well so I dunno.

 

ok guys here is what Im working with. I cant be anymore detailed than this.

supposedly there is supposed to be a solid blue tach wire from the distributor to the driver side shock tower plug, but there doesnt appear to be one on the ITR OBD2b engine harness. The CX side of the harness has 2 solid blue wires, one is by itself, the other is in the shock tower plug. Are they both tach signal wires?

heres some pics

 

ok I confirmed by the Integra schematics that the blue wire off the distro is definitely the tach signal. but now I just need to figure out where it is routed too. I thought it was supposed to go to the shock tower on the driver side...but I dont see it there.

and it looks like both blue wires on the CX side are tach signals. one is the test port, the other is connected to the plug.


Modified by RTW DC2R at 8:27 AM 4/16/2008

 

Maybe the OP and others in this post could help you answer your Tech related question https://honda-tech.com/zerothread/2277002 . Lot of useful information in there.

 

lol funny, but my question lies unanswered...

 

That wire ends in an empty plug in the driver's side shock tower IIRC.

 

and as of lately it will probably remain unanswered.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bradstard &raquo;</TD></TR><TR><TD CLASS="quote">That wire ends in an empty plug in the driver's side shock tower IIRC.</TD></TR></TABLE>

what wire are you referring to? and there is no solid blue wire at the driver shock tower plug coming from the distro. thats the problem I have, where is the wire leading to? as you can see in the pic, the sub-harness has two blue wires, one in the plug, one extra one for tach service connector.

 

I had the same problem when I did an OBD2b ITR swap in my VX.

OBD2b clusters receive the tach signal from the ECU, not the distributor. (hence no wire in the harness)
Pull a pin from your old harness and add the wire to the engine harness side distributor plug and route it to the driver's shock tower plugs.
Both of those blue wires are tach.

 

Yeah 99-00 civics have one little plug on the driver side that goes to nowhere, so do 00-01 itr's. I had to do this on my 01 itr for same reason(tach wasnt working) it is a 16-18gauge wire

 

hey when i swapped my vx i used the vx harness and just extended the wires for the o2 and vtec solenoid and i think pressure switch so if you wanna use the cx harness and do that......does the cx have a single ohc vtec motor in it or is it non-vtec.

 

CX = SOHC non-VTEC.

stick with the ITR harness, it will look and fit OEM when you're done. (plus it's easier)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">CX = SOHC non-VTEC.

stick with the ITR harness, it will look and fit OEM when you're done. (plus it's easier) </TD></TR></TABLE>

oh ok

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">I had the same problem when I did an OBD2b ITR swap in my VX.

OBD2b clusters receive the tach signal from the ECU, not the distributor. (hence no wire in the harness)
Pull a pin from your old harness and add the wire to the engine harness side distributor plug and route it to the driver's shock tower plugs.
Both of those blue wires are tach.</TD></TR></TABLE>

correct, for some reason on an obd2b engine harness there is no tach wire (dead end plug on the bottom (blue wire would go into from dizzy)

take the bottom blue wire from the dizzy (one that leads to nothing on the engine harness) and run it to the drivers side subharness and you will see where an empty spot is on the obd2b engine harness that leads to a blue wire on the body harness

i just went through this the last week and couldnt find anything about it, so i hope this thread can go in the faq or something so other people could find it easily

here was my thread i made:
https://honda-tech.com/zerothread?id=2268907

 

this is in my CX hatch, so the cluster is not OBD2. I think this cluster is a 92 EX auto cluster with tach, but from what I know the tach wiring is the same on all EG clusters.

anyway before you guys replied I decided to just give it a try and it didnt work. ran a wire directly from the dizzy blue wire, to the blue wire on the CX sub harness at the driver shock tower, and it didnt work. the tach jumped for a second, then nothing. Im gonna check the speed sensor as I think it might be jammed (its happened before) and see if that helps.

Brian the 92 CX is already prewired for vtec to the passenger shock tower, so the ITR harness plugs right in. no need to wire vtec sol or switch. and Im not using the KS so no need to wire that up. only wiring Im worried about right now is to have a working tach.

 

All OBDIIb cars/harness will need an extra wire ran from the dizzy (blue wire) to the cluster/LH shock tower

 

 

EARL told me that it has to be run to the shock tower blue wire, not the other single "service connector" blue wire. I tried it to the service connector wire so Ill try the other blue wire tomorrow.

 

if i were you i would use the pins from the old cx harness to make it as clean a connection as possible (although the distributor pin will not work unless you get one from a obd2a harness)

 

earl that seems to have worked like a charm and my cruise control light is gone too which I figured would happen. didnt get a chance to drive it yet to check the speedo but the only light I have left is the SRS light which I think I just need to loop the connector with a resistor which Ill do later on.

 

got a chance to drive it, no speedo. vtec seems to work ok though. i didnt get a chance to research it yet, but anyone got any ideas? do i need to splice into the vss or dizzy somewhere?

 

speedo comes directly from the VSS, should be no problems in that area.
That is unless your VSS has a problem.

 

checked schematics for both my ITR and the CX.

for the ITR motor/harness when it was in my ITR, the VSS the wire is blu/wht. it changes to orange at connector for the ITR sub harness on the DC2 chassis.

for the CX using the ITR motor/harness, blu/wht from the VSS, and at the shock CX tower, it changes to yel/blu.

It appears the terminals line up correctly at the shock tower plug. also the cruise control light is on again, but VTEC is working ok. if there is a problem with the VSS, VTEC is not supposed to work, right?

 

correct, unless you're chipped P28 has that function disabled... (very easy and common to do)

jack up left front tire (or right, it doesn't matter)
attach volt meter to ECU pin B10,
switch the ignition to run (don't start the engine)
slowly rotate the tire manually.
the voltage should jump from 12V to 0V as you turn the wheel.
If it doesn't go one step closer to the VSS and check it again.

three wires at the VSS (OBD2b ITR harness)
black/yellow - 12V ignition
blue/white - signal
black - ground


Modified by Relic1 at 4:54 PM 4/17/2008

 

thanks Ill give that a try but im not sure I can do that by myself. ill see what i can do.

just another note, the ITR schematic shows the VSS routing through a 7.5amp fuse under the dash (number 15) but the CX schematic doesnt seem to do this. Im not sure if that matters or not.