Re grounding the boost/atmospheric pressure sensor on my 87 N/A engine

I dont have a solid black wire... nor do i have a brown wire

I have Brown/white.. Brown/Yellow.. Black/Brown stripes.. and Brown/blue stripes


Which one do i reground? i was at discount auto today and couldnt remember which one it was. and i didnt want to fry my ECU. Also i am regrounding my ECU tomorrow morning. (To TRY and get rid of 3800 Hesitation) I'll let you guys know how it goes.

Think 10 Guage wire will be ok?


Thanks. Markus

 

bump>>

 

I *think* its the black/br wire. Double check that first, I dont want you to blow the ecu. But 10gauge is fine.

 

hurmmm.. "Think"



lol, thanks Anyone else have an idea?

--Markus

 

Look it up in the FSM.

 

where can i find the FSM?

 

fc3s.org

 

thanks dude.

- Markus

 

OK: Is there a diff from Boost sensor (shock tower) to atmospheric pressure sensor... i though they were the same thing.. i guessed wrong. anyway, i'm trying to reground the BOOST sensor on my N/A... located on the pass. front strut tower. i am currently looking thru the FSM (THanks dr0x) for the wireing... any input would be great too
thanks
- Markus

 

Checked the FSM, and this site, and can't find which wire to ground on the boost sensor (located on pass. strut tower) i do not want to find my self buying a new ECU tomorrow.. any input would be great... Oh yea.

BUMP>> _marKus)

 

Bump. FSM didnt say... HELP before i start to cry...lol

- maR-kus -

 

dr0x is right, black/brown.

 

thanks alot guys, i am doing the mod in 5min, i'll let you know if it fixes anything.

-Markus

 

On a 86 it's a brown wire with a black stripe. Somewhere in 87, I think they changed it to a pure black wire.

Brown/black....ground

Brown/white.....5v ref voltage

Brown/red......output of the BOOST SENSOR

Black/white.... 12v input

The above only for series four.

The atmospheric pressure sensor is above and to the right of the passengers knees/feet.

A 18/20 gauge wire will do just fine for the Boost sensor.

 

well, the only wire that i have that resembles brown/black... is a solid black wire, with a brown stripe... i hope that's it. Otherwise there goes my ECU huh?


-Markus

 

******Otherwise there goes my ECU huh?*******

Nope. Do any of the other wires compare with the list above???? Before I would ground the wire.....I'd get a meter out and see if the wire is grounded. Pull the plug. Get on it. Should read less than one, 1, ohm.

With the key on, the brown/red should read approx 5 volts. The black/white 12volts, the brown/red close to nothing (irrelevant voltage), and the brown/black less than one ohm when the meter is switched to ohms.

You might peel back the covering over the wires. Over time the colors fade a bit. I have a 86 and 87 and both have the colors described above and the fsm also states the same colors I gave earlier.

 

Ok i am done regrounding.. the hesitaion is not nearly as bad as it was. But i am still getting it. I have regrounded ALOT of thing

Altenator bracket - Chassis
Negitive Batt. - Chassis
Upper Fuel Rail - Chassis
Exhaust y Pipe - Chassis
Boost sesnsor - Chassis (just today)

After all that.. anything i'm missing? The only one i havnt done is the ECU.. But i'm afraid to do that one... any insight or comments would be great.

-Markus

 

Yo,


Bump for the Series 5 guys. What color wire on my 1989 GTUs? Did some grounding yesterday, trying to get the boost sensor today.

I don't have a voltmeter...any help from those in the know is appreciated!

Arigato!

Kevin
1989 GTUs "Make my high speed miss go away!"

 

Kevin, I will look that up for you when I get home today. Got to tired last night to bust out the FSM's wiring diagrams.

- Dana