P28 + J&S Safeguard = non-functional tach????
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From: Sears Point, CA
P28 + J&S Safeguard = non-functional tach????
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
Any ideas?
Austin
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From: Sears Point, CA
Re: P28 + J&S Safeguard = non-functional tach???? (TypeRmsm)
If I unhook the J&S the tach goes back to working...re-install it, and there it goes. The J&S works, but the tack doesn't...I have verified all of the wires on the HELMS manual for the 2000/2001 Integra, and they are all installed correctly...no idea.
Austin
Austin
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Re: P28 + J&S Safeguard = non-functional tach???? (Austin)
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.
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Re: P28 + J&S Safeguard = non-functional tach???? (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.
Austin
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Re: P28 + J&S Safeguard = non-functional tach???? (Austin)
Austin.. same problem with me.
except im such a lazy POS i never tried to fix it.. well once but i was working on the speedometer end trying to run a rpm signal straight from my msd to my cluster. let me know if you figure this one out!
except im such a lazy POS i never tried to fix it.. well once but i was working on the speedometer end trying to run a rpm signal straight from my msd to my cluster. let me know if you figure this one out!
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From: Sears Point, CA
Re: P28 + J&S Safeguard = non-functional tach???? (TurboR616)
Austin.. same problem with me.
except im such a lazy POS i never tried to fix it.. well once but i was working on the speedometer end trying to run a rpm signal straight from my msd to my cluster. let me know if you figure this one out!
except im such a lazy POS i never tried to fix it.. well once but i was working on the speedometer end trying to run a rpm signal straight from my msd to my cluster. let me know if you figure this one out!
It looks like I'm going to try this tomorrow morning after I drive over to Chris' Autowerks
Time to make some changes to my stock wiring 
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
(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
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Re: P28 + J&S Safeguard = non-functional tach???? (Austin)
What zip is saying should work fine. I had the same problem when i converted to obd1 using a jumper harness. My tach wouldnt work at all, and then using that trick it did.
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Re: P28 + J&S Safeguard = non-functional tach???? (Big Teggie)
Well i have no idea either, all you can do is check all your connections and make sure they are fine. Good luck man.
Austin
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Re: P28 + J&S Safeguard = non-functional tach???? (Austin)
HAHA...I figured it out 
What it was is that the SK2 harness adapter 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 
What it was is that the SK2 harness adapter 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
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Re: P28 + J&S Safeguard = non-functional tach???? (Big Teggie)
Good to see you figured it out.
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Re: P28 + J&S Safeguard = non-functional tach???? (Austin)
I am suffering from the exact same problem. I have a few questions though before I start cutting wires.
Do you know if the 1k ohm is actually required? And am I correct in reading that it actually goes between the ICM and the 12v wires? (BTW, which color is the ICM?)
What does NEP stand for, and how do I identify it?
I guess what I'm really after is this fix for dummies. I have no problem performing the trick, I just need to know which wire is what and what gets cut, etc.
Thanks for any further detail.
Do you know if the 1k ohm is actually required? And am I correct in reading that it actually goes between the ICM and the 12v wires? (BTW, which color is the ICM?)
What does NEP stand for, and how do I identify it?
I guess what I'm really after is this fix for dummies. I have no problem performing the trick, I just need to know which wire is what and what gets cut, etc.
Thanks for any further detail.
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From: Sears Point, CA
Re: P28 + J&S Safeguard = non-functional tach???? (kannon)
I am suffering from the exact same problem. I have a few questions though before I start cutting wires.
Do you know if the 1k ohm is actually required? And am I correct in reading that it actually goes between the ICM and the 12v wires? (BTW, which color is the ICM?)
What does NEP stand for, and how do I identify it?
I guess what I'm really after is this fix for dummies. I have no problem performing the trick, I just need to know which wire is what and what gets cut, etc.
Thanks for any further detail.
Do you know if the 1k ohm is actually required? And am I correct in reading that it actually goes between the ICM and the 12v wires? (BTW, which color is the ICM?)
What does NEP stand for, and how do I identify it?
I guess what I'm really after is this fix for dummies. I have no problem performing the trick, I just need to know which wire is what and what gets cut, etc.
Thanks for any further detail.
Austin
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Re: P28 + J&S Safeguard = non-functional tach???? (kannon)
cancel that. for those reading along, the resistor is hooked up at the wiring harness for the J&S. one end in the 12v+ slot (red wire).. other end in the input slot.
i didnt need to cut any wires.. the resistor worked fine, and had no negative effect on my autometer shift light.
i didnt need to cut any wires.. the resistor worked fine, and had no negative effect on my autometer shift light.