User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-02-2013, 10:41 PM #1
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
wiring diagram 99 fuel sending unit

purchased this truck for my son last year before knowing about the fuel gage issues. i want to find a wiring diagram for the sending unit so i will know which wire goes to the unit and which one is a return to ground. i have access to a potentiometer i want to want to wire in. i plan on cutting these two wires, splicing in the pot and setting it to different resistances that match full,half full,etc while still being able to drive the truck. this way if i leave on half full a few days and gage stays on half full i will know its the sending unit or a ground to the unit. if gage is still not dependable i will know its in the gage and most likely not worth the cost of repair.i wish previous owner had this fixed under the tsb but now its my problem. if you have wiring diagram or a link please let me know. autozone and chiltons dont have this in their diagrams.
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-02-2013, 10:48 PM #2
Singtoe's Avatar
Singtoe Singtoe is offline
Senior Member
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
Singtoe Singtoe is offline
Senior Member
Singtoe's Avatar
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
no grounds.

here you go

__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
Singtoe is offline   Reply With QuoteReply With Quote
Old 12-03-2013, 09:12 PM #3
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
thank you but still a question

everything i read has said to measure resistance between #2 & #3 pins on plug which would be y-r and br-b with no mention of #1 orange wire. do you know what part it plays in circuit? i see this circuit has no ground. i had thought it read resistance to ground but no matter as long as i know which wires to use.
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-03-2013, 09:50 PM #4
Singtoe's Avatar
Singtoe Singtoe is offline
Senior Member
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
Singtoe Singtoe is offline
Senior Member
Singtoe's Avatar
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
I would unplug the electrical connector under the rear seat. I would jump the Yellow /red and the orange and see if the gauge moves. I would then jump those wires with the brown/black wire and see if the gauge moves.

Keep in mind that the gauge does react slowly.

If the gauge moves, then the sending unit is bad and viceversa if nothing happens, then the instrument cluster is bad.
__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
Singtoe is offline   Reply With QuoteReply With Quote
Old 12-05-2013, 04:30 PM #5
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
thanks singtoe

i have been trying to find that connector location or the one at left kick panel w/ 20 pins
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-05-2013, 06:10 PM #6
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
now what

found connector under seat and cut y-r that goes to pin #2 and br-b to pin #3. wired in my resistor and increased and decreased resistance 12 ohm to 184 ohms which should be empty to full and gage does not move. its on empty where it mostly stays on full when hooked up.. reading troubleshooting guides say to put a 3.4 watt bulb in line at it should light up and gage raise to full. i put my meter across wires and i have less than 1 volt so even if i tried this there is no power to turn on bulb.also to check low level light connect #3(br-b) to neg battery terminal and positive to the 3.4watt light and then to #1(orange). if tank empty light will come on in a few seconds if full light wont come on. i have wires cut and no power at all to sending unit but still have a low level light.next i reconnected all wires. fuel gage went to full and low level light went off. i disconnected orange wire and gage slowly dropped and low level light came on about when it should have.if orange is low level how is light working correctly? reconnected orange and diconnected brown, gage stayed on full. reconnected brown and disconnected y-r and gage slowly dropped with low level light coming on correctly.
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-05-2013, 07:58 PM #7
Singtoe's Avatar
Singtoe Singtoe is offline
Senior Member
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
Singtoe Singtoe is offline
Senior Member
Singtoe's Avatar
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
Quote:
Originally Posted by carkivey3 View Post
found connector under seat and cut y-r that goes to pin #2 and br-b to pin #3. wired in my resistor and increased and decreased resistance 12 ohm to 184 ohms which should be empty to full and gage does not move. its on empty where it mostly stays on full when hooked up.. reading troubleshooting guides say to put a 3.4 watt bulb in line at it should light up and gage raise to full. i put my meter across wires and i have less than 1 volt so even if i tried this there is no power to turn on bulb.also to check low level light connect #3(br-b) to neg battery terminal and positive to the 3.4watt light and then to #1(orange). if tank empty light will come on in a few seconds if full light wont come on. i have wires cut and no power at all to sending unit but still have a low level light.next i reconnected all wires. fuel gage went to full and low level light went off. i disconnected orange wire and gage slowly dropped and low level light came on about when it should have.if orange is low level how is light working correctly? reconnected orange and diconnected brown, gage stayed on full. reconnected brown and disconnected y-r and gage slowly dropped with low level light coming on correctly.
Google translate please.

Did you follow my directions in post 4?

If the gauge works when you manipulate the signal then your fuel sender is bad.
__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
Singtoe is offline   Reply With QuoteReply With Quote
Old 12-06-2013, 06:59 AM #8
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
re:post 4

i never put all three together. i understand orange is the low level light. next opportunity i will try some more things. i may not have had enough patience when adjusting the pot i put in as i was expecting movement each time i adjusted resistance immediately. its very puzzling that if the orange is the low level how the light would come on anyway just before the gage hit the empty mark
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-06-2013, 08:03 AM #9
Singtoe's Avatar
Singtoe Singtoe is offline
Senior Member
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
Singtoe Singtoe is offline
Senior Member
Singtoe's Avatar
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
I didn't ever say to tie all three together. One set at a time.

If the Gauge moves and the light comes on and off, the the sender is bad.
__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
Singtoe is offline   Reply With QuoteReply With Quote
Old 12-06-2013, 09:12 PM #10
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
truck is gone for the weekend. after a little thought if i tie y-r and br-b together that will be no resistance at all. gage should be on "E" with 12 ohms so with zero it will not move. if y-r is supposed to have 5 volts and the sending unit is 12 -194 ohms then less voltage should make it read full and more voltage read empty. in a DC circuit you get a voltage drop across resistance. so the higher the resistance the more voltage drop. interested in knowing if y-r is positive voltage thru sending unit to gauge and the other side of gauge is ground. also interested in if y-r is positive to lowfuel light how i still got a low fuel light with orange disconnected
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-06-2013, 09:44 PM #11
Singtoe's Avatar
Singtoe Singtoe is offline
Senior Member
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
Singtoe Singtoe is offline
Senior Member
Singtoe's Avatar
 
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
Singtoe will become famous soon enough
I don't remember what the orange wire is.

Here is an interesting tidbit. I did a swap a couple years ago and during that time, I retrofitted a Sequoia gauge cluster in my 4runner.

Long story made short, My fuel gauge was malfunctioning from the swap. When the tank was full, it read empty and had the low fuel light on in the dash and when the tank was empty, it showed the gauge being full and the light off.

I had to turn my fuel sender up side down to get it to read right. Problem solved.



You are making a mountain out of an ant hill.

Does the gauge work when you manipulate the signal (touch the wires together)? If it does then the fuel sender is bad.

If it doesn't then the gauge is bad or less likely one of the wires from the sender to the gauge is bad.
__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
Singtoe is offline   Reply With QuoteReply With Quote
Old 12-06-2013, 10:14 PM #12
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
i have found all other toyotas are empty high resistance and full low resistance just the opposite of 4runners. as i stated if low resistance(12ohms) is empty and 184ohms full then no resistance will go from off and gauge showing empty to on and gauge showing empty.
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-07-2013, 01:03 PM #13
TheDurk's Avatar
TheDurk TheDurk is offline
Elite Member
 
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,494
TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light
TheDurk TheDurk is offline
Elite Member
TheDurk's Avatar
 
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,494
TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light TheDurk is a glorious beacon of light
FSM testing procedure is on pp BE-51 & 52 here:

http://tacoma.site40.net/4Runner_96-...ommet/insp.pdf
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
TheDurk is offline   Reply With QuoteReply With Quote
Old 12-07-2013, 09:00 PM #14
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
thanks thedurk

if a 99 is the same this really helps. i can see positive thru fuel gage first which will drop the voltage maybe (even to the 5 volts i had read somewhere else) then thru the sending unit to ground. when the sending unit changes resistance it will also change voltage at gauge. hope i get a chance monday
carkivey3 is offline   Reply With QuoteReply With Quote
Old 12-09-2013, 06:35 PM #15
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
carkivey3 carkivey3 is offline
Junior Member
 
Join Date: Dec 2013
Location: north carolina
Posts: 17
carkivey3 is on a distinguished road
tested voltage

rainy,cold here in nc so i did not spend a lot of time on it. i tested voltage between y-r and bl-b and go nothing. tested between y-r and a good ground and got 4.8 vdc. tested continuity between bl-b and same ground point and got no connection. this told me bl-b back to combination meter has lost ground somewhere. since i had already cut and spliced wires last week i wired in another ground and tied into bl-b. gauge is now reading about 3/4 tank with 56 miles since last fill-up. will have him watch gauge and hopefully problem is solved. will post results later. thanks to everyone
carkivey3 is offline   Reply With QuoteReply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for gas tank with fuel pump and sending unit Reggie Want to Buy/Trade 0 10-20-2013 08:08 AM
Fuel Sending Unit Mayhem! Squintoo 3rd gen T4Rs 3 10-05-2013 06:08 PM
Fuel Sending Unit Application hickfromfrenchlick Classic T4Rs 1 01-16-2012 09:33 PM
2003 Bad fuel sending unit a77boy Problems & Warranty Issues 2 09-09-2008 12:32 PM
Fuel Sending Unit FiendlyLock Classic T4Rs 5 11-05-2007 06:08 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 05:00 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020