the brain... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jarnld · 08-23-2002, 01:07 PM

i called APC today and they said to wire the control module of my tach to the "brain".  What is the brain?? is it in the tach or on the car? if so...where?!?  kinda weird i thought...little help guys.

adey · 08-23-2002, 01:18 PM

ahhh no wonder, it's an APC. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='

'> Kidding. (sort of...)
Anyway my best understanding of "brain" would be ECU ... but plugging your tach into your ECU? Sounds kind of strange. Maybe your fuse box? ...errr... :shrug:

numatik · 08-23-2002, 02:17 PM

on your ECU there is at least 1 wire that carries a "tach" signal. The voltage on this wire changes as the engine RPMs change. What year is your 240? If you go to a place that installs alarm systems they can probably find it for you.

jarnld · 08-26-2002, 01:01 PM

its a 1990...so it is on the ECU then...

chickenmanq · 08-26-2002, 11:03 PM

Wait a minute.  It's a 90, right?  Doesn't that just have a regular distributor coil?  That'd be easy as anything.  Does the distributor have a central post?

If it's an internal coil in the dist, then probe wires from the condenser unit on the side of the dist.  Should be a blue and a black.  One of those is it.  Check them with a volt meter and rev it.  The voltage will go up and down.

jarnld · 08-27-2002, 12:11 PM

the tach works...the rpms go up with the factory tachometer...im just talking about how to get it to light up...

Alias · 08-27-2002, 06:56 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (jarnld @ Aug. 27 2002,12:11)</td></tr><tr><td id="QUOTE">the tach works...the rpms go up with the factory tachometer...im just talking about how to get it to light up...</td></tr></table><span id='postcolor'>
You just can't get it to light up? LOL. Did you try hooking it up to a 12V source?

jarnld · 08-28-2002, 01:14 PM

i did hook it up to a power source...its not as easy as you think though...the white wire that normally comes with tachs has been replaced by a little box with two black wires a red wire and a white wire.  Its the color inverter/control moddule.  I dont know where that goes.  Hooking it up to a 12v source doesnt get it to turb on...All this doesnt really matter though...i returned it cause its a POS APC.  thanks thought guys.

08-23-2002, 01:07 PM	#1
jarnld Leaky Injector Join Date: Jul 2002 Posts: 65 Trader Rating: (0) Feedback Score: 0 reviews	i called APC today and they said to wire the control module of my tach to the "brain".  What is the brain?? is it in the tach or on the car? if so...where?!?  kinda weird i thought...little help guys. __________________ there is a barber in town that shaves only people who do not shave themselves.  Does he shave himself?   think about it...

08-23-2002, 01:18 PM	#2
adey Post Whore! Join Date: Mar 2002 Location: Hong Kong Posts: 3,072 Trader Rating: (0) Feedback Score: 0 reviews	ahhh no wonder, it's an APC. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=''> Kidding. (sort of...) Anyway my best understanding of "brain" would be ECU ... but plugging your tach into your ECU? Sounds kind of strange. Maybe your fuse box? ...errr... :shrug: __________________ Instagram: @SX180HKG

08-26-2002, 01:01 PM	#4
jarnld Leaky Injector Join Date: Jul 2002 Posts: 65 Trader Rating: (0) Feedback Score: 0 reviews	its a 1990...so it is on the ECU then... __________________ there is a barber in town that shaves only people who do not shave themselves.  Does he shave himself?   think about it...

08-26-2002, 11:03 PM	#5
chickenmanq Zilvia FREAK! Join Date: Nov 2001 Posts: 1,000 Trader Rating: (0) Feedback Score: 0 reviews	Wait a minute.  It's a 90, right?  Doesn't that just have a regular distributor coil?  That'd be easy as anything.  Does the distributor have a central post? If it's an internal coil in the dist, then probe wires from the condenser unit on the side of the dist.  Should be a blue and a black.  One of those is it.  Check them with a volt meter and rev it.  The voltage will go up and down. __________________ <img src=http://dana.ucc.nau.edu/~mka/av620b.jpg> -"Yeah? Well Your Mom Drives A Civic Type R!" 81 Honda Accord Hatchback. EK1 engine. 78 Datsun 620. L20B engine. I'll try to have pics soon. Check the website for more. http://dana.ucc.nau.edu/~mka

08-27-2002, 12:11 PM	#6
jarnld Leaky Injector Join Date: Jul 2002 Posts: 65 Trader Rating: (0) Feedback Score: 0 reviews	the tach works...the rpms go up with the factory tachometer...im just talking about how to get it to light up... __________________ there is a barber in town that shaves only people who do not shave themselves.  Does he shave himself?   think about it...

08-23-2002, 02:17 PM	#3
numatik Join Date: Aug 2002 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	on your ECU there is at least 1 wire that carries a "tach" signal. The voltage on this wire changes as the engine RPMs change. What year is your 240? If you go to a place that installs alarm systems they can probably find it for you.

08-27-2002, 06:56 PM	#7
Alias Zilvia Member Join Date: Mar 2002 Location: Piqua,OH Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (jarnld @ Aug. 27 2002,12:11)</td></tr><tr><td id="QUOTE">the tach works...the rpms go up with the factory tachometer...im just talking about how to get it to light up...</td></tr></table><span id='postcolor'> You just can't get it to light up? LOL. Did you try hooking it up to a 12V source?

08-28-2002, 01:14 PM	#8
jarnld Leaky Injector Join Date: Jul 2002 Posts: 65 Trader Rating: (0) Feedback Score: 0 reviews	i did hook it up to a power source...its not as easy as you think though...the white wire that normally comes with tachs has been replaced by a little box with two black wires a red wire and a white wire.  Its the color inverter/control moddule.  I dont know where that goes.  Hooking it up to a 12v source doesnt get it to turb on...All this doesnt really matter though...i returned it cause its a POS APC.  thanks thought guys. __________________ there is a barber in town that shaves only people who do not shave themselves.  Does he shave himself?   think about it...