I am putting a OBDII B18c in a 99 EX, and the distributor plugs are different. The B18C distributor plug has 9 wires and the EX harness plug has 8 wires along with being a different shaped plug. The wires are all the same color, except for the 9th wire which is blue. What do I do with this?


Modified by FyReo3 at 11:32 PM 6/17/2005

 

Search for diagarms for both dizzys and do a plug swap or buy a obd1 gsr dizzy it will plug up to your harness

 

All I can come up with is ECU pinouts. I have the GSR harness, but I do not know what wire mates up with the 9th one.

 

The blue wire on the 9-pin distributor is for the tach signal, however on cars equipped with an 8-pin distributor, the ECU has an output that feeds the tach in the cluster.

If you owned a Helms, you'd know this.

 

Thanks for the reply. I did figure out what it was for, but have no idea as to what to do with it.

 

Anyone else deal with this issue?

 

Up.

 

Is this too obvious of a question and I am overlooking it, or has no one had to deal with this?

 

This...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FyReo3 &raquo;</TD></TR><TR><TD CLASS="quote">Is this too obvious of a question and I am overlooking it, or has no one had to deal with this?</TD></TR></TABLE>

along with this...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">If you owned a Helms, you'd know this.</TD></TR></TABLE>

is probably why you don't have an answer.

Something needs to drive the tach in the cluster as well as the test tach connection - if the Blue wire from the distributor doesn't do it, then the ECU does it.

Buy a Helms already.

 

Hey man, you dont have to come off like that. I do have a Helm manual, and I have been trying to comprehend everything. As it is apparent, this is my first time dealing with this and I am trying to learn.

I am having a hard time understanding the schematics, and translating them into what I am trying to accomplish. I do not know how the conversions affect this being that my car is orignally OBDII, converted to OBDI, and trying to use a differently wired OBDII distributor.

 

up.

 

do you still have your obd2b sohc dizzy? if you do, just take out the pins and use the case and vice verca on your new dizzy, that way your clips will fit. leave the big blue wire out, correct me if im wrong, but i think your tach will still work without that wire. good luck

here's the wire diagram as well

http://img248.echo.cx/my.php?i...l.jpg

 

Thanks for the reply.

Yes, I still have the D16 distributor, but I also have the B18C harness.
If I replace my harness plug with the B18C harness plug and not wiring anything into the harness side plug for the blue wire, everything will be fine?
I understand that the tach will receive a signal from the ECU, but I did not know if the blue wire was necessary.

Also, since they are both OBDII, the wires should match in color, right?

Thanks again for the help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FyReo3 &raquo;</TD></TR><TR><TD CLASS="quote">Yes, I still have the D16 distributor, but I also have the B18C harness. If I replace my harness plug with the B18C harness plug and not wiring anything into the harness side plug for the blue wire, everything will be fine?
I understand that the tach will receive a signal from the ECU, but I did not know if the blue wire was necessary. Also, since they are both OBDII, the wires should match in color, right?</TD></TR></TABLE>

You're not trying to use a D-series distributor on a B-series motor, are you? Don't.

If you replace your Ex harness plug with the GS-R harness plug and don't wire the Blue tach wire - where is the tach signal going to come from....thin air?? This is what I've been trying to tell you - the distributors that use an 8-pin plug use the ECU as the tach output signal. On distributor that use a 9-pin plug, the distributor outputs the tach signal.

So it should be pretty clear - if you're using a GS-R motor with a GS-R distributor and a GS-R ECU, then you need the Blue wire for the tach signal but if you don't wire it, its not going to keep the car from running.

The ECU still gets its 'tach' signal from the sensors in the distributor but it doesn't output a tach signal to the cluster (9-pin).

As for the wires matching...c'mon now - you've got a Helms. The wires have labels such as CKP P and CKP N or TDC P and TDC N - these are standard naming conventions shared between Honda and Acura, so to answer this question is as simple as looking in the Helms, matching them up and making sure wires of similar color really carry the same signal.

 

No, I am not going to use the D16 distributor.

The main reason i am confused is the fact that I am not going to be using a GS-R ecu, I will be using my chipped P28. Based upon what you stated earlier, I was under the assumption that the blue wire from the distributor would not be need since the ecu would output the signal to the cluster.

As far as the wiring, yes I do realize that it is described in Helms, but the conversion is confusing to me. I am doing my best to understand this and I do appreciate your time to try and help.