P28 S200 in OBDII ITR, tach not working

vactor · Post by **vactor** » Wed Apr 02, 2003 1:12 pm

i have an S200 system in my 2000 ITR. system works fine, datalogging is working. however, the ITR tachometer does not work anymore. it is my understanding that i have to splice 2 wires to get the tach to work? any suggestions? then i gotta get to tuning as the car stalls at idle once it is warmed up (with Venom 440cc injectors). anyway, tach help would help

additionally, i have a J&S Ultra Safeguard V1 installed.

it is my understanding i splice A19 and B13 ... however, this does not produce any tach movement ...

vactor · Post by **vactor** » Thu Apr 03, 2003 12:47 pm

i got a tip from another user to connect a 1k ohm resistor between the red and green wires from the J&S (+12v and input from ECU B13 ICM wire). gonna go ahead and try this ...

vactor · Post by **vactor** » Thu Apr 03, 2003 2:17 pm

tried the 1kohm trick. the tach jumped once on startup, but nonthing thereafter ... anyone with some ideas?

vactor · Post by **vactor** » Fri Apr 04, 2003 12:11 pm

i also tried splicing the NEP wire to the ICM wire, and splicing a 1kohm resistor from the ICM wire to the IGP1 wire. still no improvement (tach works for 1-2 seconds then stops working). i unplugged the safeguard and connected the ICM wires togethe, tach works perfectly. it also works with the J&S installed and the stock ecu ... this is getting a bit annoying. any help here?

Austin · Post by **Austin** » Thu Apr 10, 2003 4:06 pm

Here is a copy and past from when I had this issue, just read the bold section if you just want the answer:

OK....installed a P28 based Hondata stage 2, everything runs fine...then I installed a J&S Safeguard, tachometer stopped working. I hear that you need to install a 1k ohm @ 1/4 watt resistor from the J&S ICM input to the +12V, tried that, but it still doesn't work.
Any ideas?

Austin

Zip.........................................................
If you have already performed the 1K pull-up to the ICM wire then check your OBDII to OBDI harness. Make sure the NEP wire from OBDI harness is attached to the ICM wire. If not, just tap the NEP wire from the OBDII harness to the OBDII ICM wire.
...........................................................................

11:47 PM 2/17/2002) zip: So with the NEP wire jumped to the ICM source, the tach still doesn't work with the 1K pull-up mod?

(11:49 PM 2/17/2002) Austin: Nope, didn't work...I installed the 1K ohm @ 1/4 watt resistor, and it stays the same. I spoke with Mike(Xerzex) earlier just to confirm that I had the correct information, as he has a P28 and a J&S installed.

(12:02 AM 2/18/2002) zip: I just did a Hondata P28 & J&S install and it worked great. In my experience, without jumping the NEP wire to the ICM wire the tach didn't work even with the 1K pull-up. After performing the NEP to ICM jump along with the 1K pull-up, the tach worked. Here is a method to fix the NEP problem:
Tap into BLUE NEP wire A19 of your stock OBDII harness. Run a wire from A19 to the YEL/GRN ICM wire B13 of your stock OBDII harness.
(12:06 AM 2/18/2002) Austin: Thanks Zip...I'll try that tomorrow morning, I'm at a friends using their bandwidth, and it's a little late. I'll post up what I find out tomorrow. I can tell you that the Audible Alert is still working perfectly fine
Austin

HAHA...I figured it out What it was is that the SK2 harness adapte
r had the NEP and ICM wire connected at the ECU, then split...when I cut the ICM wire and rerouted it through the J&S it screwed everything up, cut the NEP wire and tapped it into the ICM wire after it went through the J&S...the only problem now is that the shift light stopped working correctly.

Austin

P.S. shift light works now because I forgot that I had unplugged it back then :p

QUICKSILVER RACING · Post by **QUICKSILVER RACING** » Thu Apr 10, 2003 5:54 pm

That is correct. B13(ICM1) and A19(NEP) should be connected to OBD1 ICM1.

I don't have a J&S so try it witout the J&S first. Divide and conquer.

vactor · Post by **vactor** » Thu Apr 10, 2003 8:23 pm

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, Vlue) 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.

QUICKSILVER RACING · Post by **QUICKSILVER RACING** » Thu Apr 10, 2003 11:59 pm

Sorry I din't have answer for this one then. Try calling Matt at Hondata. Maybe he has an answer.

vactor · Post by **vactor** » Fri Apr 11, 2003 5:46 pm

i did all the wiring again today and double checked everything. STILL no resolution. this is getting pretty darn annoying.

QUICKSILVER RACING · Post by **QUICKSILVER RACING** » Fri Apr 11, 2003 6:17 pm

Could you email the manual of J&S to me?

khristan@mindgate.net

I'll see what I can do.

vactor · Post by **vactor** » Sat Apr 12, 2003 12:47 pm

the thing that gets me a bit confused is that the tach worked with the J&Sn and the stock ECU, as well as with the stock ECU and the EFI PMS inserted in between. for some reason the P28 just ain't happy with the J&S ...

QUICKSILVER RACING · Post by **QUICKSILVER RACING** » Sun Apr 13, 2003 5:51 am

I saw the manual. I couldn't find anything that I could suggest.

Did you try wiring NEP and ICM1 to the white wire of J&S.

I am not sure about this but you can try it. It's safe.

1. Remove Jumper between IGP1 and B13.
2. Remove Jumper between A19 and B13.
3. Make sure that A19 an B13 are not shorted. There may be circuitry underneath designed to connect them together. Because when the J&S outputs a signal in the white wire it will loop back to the ECU
4. Cut B13 (ECM) and connect to green J&S wire.
5. Connect B13 (DIST side) to white J&S wire.
6. Look for the NEP (DIST Side) wire and connect to the white J&S wire.
7. Leave the NEP wire (ECU side) open.

OR

Leave the NEP wire connected to B13 ECU side. Connect only the B13(DIST SIDE) to the J&S white wire.

Hope it works out.

vactor · Post by **vactor** » Mon Apr 14, 2003 3:04 pm

i'm still looking for a solution. i have my wideband setup coming wednsday (as well as my programmer and burner). would be nice to have a 100% driveable car by the weekend ...

Austin · Post by **Austin** » Tue Apr 15, 2003 12:29 pm

I'm figuring that the ECU adapter that Hondata uses for their integrated plugs has the NEP and ICM wire connected at the ECU, then splits off to different pins at the plugs(since this is designed to fit multiple cars that have slightly different wiring), you need to cut the NEP wire and tap it into the ICM wire after it goes through the J&S.

Hope that helps,
Austin

vactor · Post by **vactor** » Tue Apr 15, 2003 1:50 pm

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, Vlue) 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.

Austin wrote:

I'm figuring that the ECU adapter that Hondata uses for their integrated plugs has the NEP and ICM wire connected at the ECU, then splits off to different pins at the plugs(since this is designed to fit multiple cars that have slightly different wiring), you need to cut the NEP wire and tap it into the ICM wire after it goes through the J&S.

ok, so i cut the NEP wire, then take the NEP wire which is still connected to the ECU, and connect that to the ICM wire directly?