Tach ECU wire, auto - Toyota Yaris Forums

Liu997 · 05-03-2009, 10:16 PM

I was just installing a tach on my yaris when, I realized that I didn't have the greenish blue wire on my OBD II port. I am guessing that an auto has it on a different wire. Can someone tell me which one is it?

PHXDEMON · 05-03-2009, 10:44 PM

Your best bet would probably be to swap to a manual transmission so you actually utilize a tach

Liu997 · 05-03-2009, 11:13 PM

no one knows, or have installed a tach on an auto?

CTScott · 05-03-2009, 11:24 PM

Same position, but on my 09 it is beige:

schleppy · 05-05-2009, 09:20 AM

^ I used that same wire and it works great.

Liu997 · 05-05-2009, 11:37 PM

What should I set the tach to, I am guessing 4 cly. But when I reved it up in neutral, it went to 7K rpm. Just thinking thats kinda odd.

mikenacarato · 05-05-2009, 11:38 PM

it does on mine too. why do do you even need a tach for an auto?

Liu997 · 05-06-2009, 12:49 AM

idk, just like to see whats happening and or if the auto is shifting dumbly

GnomeBody · 05-06-2009, 02:44 PM

lol Im driven an auto and I put in a tach too

we may not need it for shifting but its still nice to see the RPMs for what ever reason. In my last car (also an auto) it had a stock tach, At one point I started having this misfire that would only occur between 3700 & 4300 rpm. It was a dead give away when I googled 'misfire' and the said RPM range. if it wasnt for the tach I wouldnt have been able to diagnose it myself, so IMO, tachs arnt just for shiftin

.

05-03-2009, 10:16 PM	#1
Liu997 Drives: 2008 Red Yaris LB Join Date: Nov 2008 Location: Hicksville, LI Posts: 125	Tach ECU wire, auto I was just installing a tach on my yaris when, I realized that I didn't have the greenish blue wire on my OBD II port. I am guessing that an auto has it on a different wire. Can someone tell me which one is it?

05-06-2009, 02:44 PM	#9
GnomeBody AD&D Dork Drives: 07Liftback/07sedanS Join Date: Oct 2008 Location: US-V.A. Posts: 83	lol Im driven an auto and I put in a tach too we may not need it for shifting but its still nice to see the RPMs for what ever reason. In my last car (also an auto) it had a stock tach, At one point I started having this misfire that would only occur between 3700 & 4300 rpm. It was a dead give away when I googled 'misfire' and the said RPM range. if it wasnt for the tach I wouldnt have been able to diagnose it myself, so IMO, tachs arnt just for shiftin. __________________ Mods: K&N filter, Megan Coilovers, Ultra Racing 19mm rear sway bar, Sun tachometer, Window Tint.

05-03-2009, 10:44 PM	#2
PHXDEMON View User's Garage Drives: 2007 Red Liftback Join Date: Oct 2008 Location: Phoenix, AZ Posts: 885	Your best bet would probably be to swap to a manual transmission so you actually utilize a tach

05-03-2009, 11:13 PM	#3
Liu997 Drives: 2008 Red Yaris LB Join Date: Nov 2008 Location: Hicksville, LI Posts: 125	no one knows, or have installed a tach on an auto?

05-03-2009, 11:24 PM	#4
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Same position, but on my 09 it is beige:

05-05-2009, 09:20 AM	#5
schleppy I love momentum. View User's Garage Drives: 2009 Yaris LB, Red Join Date: Feb 2009 Location: Boston, MA Posts: 587	^ I used that same wire and it works great.

05-05-2009, 11:37 PM	#6
Liu997 Drives: 2008 Red Yaris LB Join Date: Nov 2008 Location: Hicksville, LI Posts: 125	What should I set the tach to, I am guessing 4 cly. But when I reved it up in neutral, it went to 7K rpm. Just thinking thats kinda odd.

05-05-2009, 11:38 PM	#7
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	it does on mine too. why do do you even need a tach for an auto?

05-06-2009, 12:49 AM	#8
Liu997 Drives: 2008 Red Yaris LB Join Date: Nov 2008 Location: Hicksville, LI Posts: 125	idk, just like to see whats happening and or if the auto is shifting dumbly