P28 S200 in OBDII ITR, tach not working

speed2000si · Post by **speed2000si** » Sat May 31, 2003 3:11 pm

vactor wrote:SUCCESS!! thanks everyone for the help. i cut the NEP wire, then connected the distributor end of the NEP wire to the output of the J&S. works like a charm. a BIIIGG thanks to EVERYONE!!

I am having the same problem in my 2000 Si. So, what is an NEP wire? I can't find it in the Haynes schematic. Thanks.

vactor · Post by **vactor** » Sat May 31, 2003 7:17 pm

speed2000si wrote:
vactor wrote:SUCCESS!! thanks everyone for the help. i cut the NEP wire, then connected the distributor end of the NEP wire to the output of the J&S. works like a charm. a BIIIGG thanks to EVERYONE!!
I am having the same problem in my 2000 Si. So, what is an NEP wire? I can't find it in the Haynes schematic. Thanks.

read the post:

well, like i indicated earlier, the P28 ecu is one direct from hondata so there is no conversion harness, the ecu has the OBDII plugs on it from hondata. afaik, i tried (and just checked again) connecting the NEP wire (A19, Blue) with a jumper to the ICM wire (B13, Yel/Grn), and then a 1kohm jumper from the ICM wire (B13, Yel/Grn) to the IGP1 wire (B1, Yel/Blk). still negative results. anyone else? the tachometer DOES work when i remove the J&S.

speed2000si · Post by **speed2000si** » Sun Jun 01, 2003 7:45 am

I'm trying to figure out what an NEP wire is (what does NEP stand for? or what else would it be know as in wiring diagrams), since A19 on my ECU is the A/C wire, and there are many other blue wire connected to the ECU.

QUICKSILVER RACING · Post by **QUICKSILVER RACING** » Sun Jun 01, 2003 5:40 pm

NEP wire is tach signal. OBD1 doesn't have it. OBD2 however has NEP and ICM wire. You just wire it together in OBD1's ICM I/O.

Post by **Spunkster** » Fri Jun 06, 2003 9:22 am

You will need to contact J&S for the solution to this. I remember this happening one other time and John at J&S was able to resolve it with that customer.

Austin · Post by **Austin** » Mon Jun 09, 2003 5:24 pm

Spunkster wrote:You will need to contact J&S for the solution to this. I remember this happening one other time and John at J&S was able to resolve it with that customer.

Yep...that was me, and you and I spoke.

Austin

speed2000si · Post by **speed2000si** » Sat Jun 14, 2003 11:06 am

Ok, on my car the NEP is the blue wire going into A17.