YotaTech Forums  

Go Back   YotaTech Forums > Toyota SUV & Truck Tech > 86-95 Trucks & 4Runners
Sign in using an external account
Register Forgot Password?
Search


86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Welcome to Yotatech!
Welcome to Yotatech,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 11-24-2009, 10:56 AM   #1
Registered User
Personal Sales Rating: (0)
 
Join Date: Mar 2008
Location: BC canada
Posts: 50
o2 sensor wiring

I've searched a ton. Theres lots of info out there on sensor wiring. But i cant find anything for the truck wiring. My truck is a 90 4 runner with a 22re. It has a 4 wire o2 sensor.

the wires on the sensor are the typical :
Blue (signal +)
white (signal -)
black (heater)
black (heater)


I need help figuring out what those wires should hook up to on the truck side. The oem plug is long gone and the wires have been butt connected together. But i dont think the previous owner hooked them up right.


wire colours on the truck are as follows.
black and double insulated. i assume this is the sensor (+)
brown
white w/ red stripe
pink or brown w/ green stripe.


Thanks for your help.
This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!
__________________
90 4 runner 22re stock
87 ex.cab 22re 33's
84 ex cab 6inch lift 35in krawlers dual t case with 23 spline 4.7's 4:88's locked longs etc etc etc
toyotalytrevor is offline   Reply With Quote
Old 11-25-2009, 06:46 PM   #2
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Mar 2008
Location: BC canada
Posts: 50
well i did some diagnosing. one of the heater circuit wires was hooked up to a "sensor signal" wire. anyways i fixed that. still same code. so i replaced the o2 sensor with a new ngk sensor. same problem.

code 21. I cleared the codes ( unhooked batt for 5min) and before i even started it i checked and code 21 was still there . whats wierd is. sometimes as soon as i start the truck, the c.e.l comes on. other times it stays off until i give it some throttle. Its also started to bog down on acceleration.


any ideas??
__________________
90 4 runner 22re stock
87 ex.cab 22re 33's
84 ex cab 6inch lift 35in krawlers dual t case with 23 spline 4.7's 4:88's locked longs etc etc etc
toyotalytrevor is offline   Reply With Quote
Old 11-26-2009, 04:54 PM   #3
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Mar 2008
Location: BC canada
Posts: 50
seems like im talking to myself here....... do i smell or somethin? lol


anyways got some more work done today. changed the spark plugs and put in a computer from a 87 p/u. CEL is now off and thing drives great. exhuast still smells a little rich. But the cat is hollow. I have go get "aircared" as we call it up here. I have anew cat to put on. hopefully she passes.


Anyone know the differences between computers? The plugs on the computer were a different colour. the 87 had yellow plugs the 90 has grey. also the 87 only had a single wire o2 sensor. the 90 has a 4 wire sensor. I'm gonna look for a good used one of the proper year. But so far seems to work good.
__________________
90 4 runner 22re stock
87 ex.cab 22re 33's
84 ex cab 6inch lift 35in krawlers dual t case with 23 spline 4.7's 4:88's locked longs etc etc etc
toyotalytrevor is offline   Reply With Quote
Old 11-26-2009, 06:01 PM   #4
Registered User
Personal Sales Rating: (0)
 
tj884Rdlx's Avatar
 
Join Date: Apr 2007
Location: ATL!
Posts: 1,184
just so you're not hearing an echo for three days, i'll chime in. i just changed a 4wire ox on my 88. white/blue/2 black. but my harness was under the seat, a 4 pin yellow, so i was able to trace and cut in the new one. (the new one had a short plug)

as you mentioned, an 87 is single wire Ox, and much more basic emission controls. your truck may have TWO Ox sensors. i don't think you can use an 87 computer in a 90. check out the diagrams in this link. i glanced and saw one of the wires on the main Ox was pink/green as you mentioned. hope this helps.

http://www.ncttora.com/fsm/1990-1995...5/contents.htm
__________________
88 4Runner DLX, 15x8 soft8s w/ BFG 33x10.5 A/Ts. 1.5" SDORI spacers, 4.88s, OME CS009s, 1" 4crawler b.l., original Canback top
tj884Rdlx is offline   Reply With Quote
Old 11-26-2009, 06:27 PM   #5
Registered User
Personal Sales Rating: (0)
 
bugs1961's Avatar
 
Join Date: Jul 2006
Location: Anchorage
Posts: 479
The FSM here: http://www.ncttora.com/fsm/index.html and labeled 90-95 4Runner (shows a red 4Runner) has an electrical manual for the 3vz. In the "engine control", 3VZ section, page 62, is the wiring diagram for the oxygen sensors.

I would be interested in seeing if the aircare passes you with the incorrect year ECM installed. Let us know what happens.
__________________
'89 V6, 5 spd truck and '01 4Runner

Reduce the Government Footprint: Support Your Local Tea Party!
bugs1961 is offline   Reply With Quote
Old 11-26-2009, 07:44 PM   #6
Registered User
Personal Sales Rating: (0)
 
abecedarian's Avatar
 
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,680
Took me about 5 minutes to search:

http://www.yotatech.com/f116/91-3-0-.../#post50947549

Pin 1; Pnk-Grn, ECU controlled ground for heater element
Pin 2; Red-Wht, ECU supplied B+
Pin 3; Black, Oxygen sensor output in millivolts. Can be measured in Diagnostic connector (pin 4, marked Ox)
Pin 4; Brown, Ground
__________________
Proud member of Yotatech's 12000+ post club.

abecedarian is offline   Reply With Quote
Old 11-27-2009, 05:01 PM   #7
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Mar 2008
Location: BC canada
Posts: 50
thanks for the input guys. I plan on finding the proper computer for it on monday. I just needed to get it running properly and changing the computer seemed to do the trick for now.

Thanks for the links too. I tried searching, but i guess if you dont put the proper keywords in, it can take awhile.
__________________
90 4 runner 22re stock
87 ex.cab 22re 33's
84 ex cab 6inch lift 35in krawlers dual t case with 23 spline 4.7's 4:88's locked longs etc etc etc
toyotalytrevor is offline   Reply With Quote
Old 11-21-2011, 05:10 PM   #8
Registered User
Personal Sales Rating: (0)
 
Aido's Avatar
 
Join Date: Nov 2011
Location: Ontario, Canada
Posts: 7
I wouldn't run that 87 ecu in it for too long. 85-(mid) 88 efi engines run low resistance fuel injectors that require a resistor pack to lower the ohm reading to 3.5 ohms. Later models have high resistance injectors (13.5 ohms) and do not require the resistor pack. Although your truck may have run ok with the 87 ecu, it would probably end up burning out the injector driver circuitry, rendering the ecu inoperable.
Aido is offline   Reply With Quote
Old 11-21-2011, 05:10 PM
Yotatech
4WD Truck




Paid Advertisement
Reply

Tags
22re, 90, acceleration, bogs, canada, diagram, heater, o2, oxigen, oxygen, runner, sensor, sensors, wir, wire

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 03:51 AM.


2010 InternetBrands, Inc.