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Author Topic:   What is WOT relay
mustang90LX50
Journeyman

Posts: 15
From: Chesapeake, VA USA
Registered: Dec 2004

posted 02-10-2005 01:41 AM     Click Here to See the Profile for mustang90LX50   Click Here to Email mustang90LX50     Edit/Delete Message   Reply w/Quote
what is WOT relay location in the engine compment

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Moneymaker
Administrator

Posts: 26513
From: Lyons, IL, USA
Registered: May 99

posted 02-10-2005 06:20 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
TPS on the throttle body.
TPS = throttle positioning sensor.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
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Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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Tom G
Gearhead

Posts: 616
From: Bethlehem, Pa USA
Registered: Nov 2001

posted 02-12-2005 02:25 PM     Click Here to See the Profile for Tom G   Click Here to Email Tom G     Edit/Delete Message   Reply w/Quote
TPS voltage key on engine off

This should help.
The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small file to achieve the desired reading.

The spec range for Key On is from .88 to 1.0 volt; shoot for the .97 to .99 volt. With the engine running, the voltage should be no higher than 1.05 volts.

Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer.

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67 Mustang F/B 302 GT-40X FMS engine RPM Air Gap 650 BG CLAW Edelbrock 100 shot N2O Crane 1.7 rollers ceramic coated headers T5, cable clutch Flows X Pipe 3.89 9". Clearwater Aqua GT Clone Vintage40 series 16X8 225 front 255/50 rear drag radials 13.25 @ 103mph 88 GT 5 spd new project 77k original miles Red and Silver

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ddenton749
Gearhead

Posts: 487
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 02-12-2005 07:05 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
WOT=Wide Open Throttle

The TPS signals the EEC that you are asking for full power from the engine. In turn the EEC goes to look up tables for power instead of fuel economy to set the fuel injector time and ignition timing. The WOT relay turns off the AC compressor while you have your foot to the floor.

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'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

[This message has been edited by ddenton749 (edited 02-12-2005).]

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Russ3747
Journeyman

Posts: 52
From: Raleigh, NC
Registered: Jan 2004

posted 02-14-2005 11:12 PM     Click Here to See the Profile for Russ3747   Click Here to Email Russ3747     Edit/Delete Message   Reply w/Quote
whats the orange wire for on the TPS?

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ddenton749
Gearhead

Posts: 487
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 02-15-2005 01:51 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
First, I have to say this again: I highly recommend a book called, "How to Understand, Service and Modify Ford Fuel Injection & Electronic Engine Control" by Charles O. Probst, SAE. ISBN 0-8376-0301-3, paparback, $34.95, available at Amazon. It's an awesome explanation and reference for the Ford EEC-IV systems.

There are three wires on the TPS, although I don't know their colors. One is VREF which should be approximately 5 volts. The second is the TP Signal (to the computer) and the voltage should be somewhere between 0.6 (closed throttle) and 4.5 volts (open throttle). The third wire is the Signal Return. It's a common wire back to the computer that all the VREF sensors connect to. (TPS, ECT, MAP, EVP)

Unplug the TPS and probes between the VREF and SIG RET. The voltage should be between 4-6 volts. If not it's a fault in the VREF circuit.

Reconnect the plug. Turn the key off and wait 10 seconds.

Check the voltage between the TP SIG and SIG RET by pushing your voltmeter test probes through the back of the plug while it is connected and KOEO (key on engine off). You can also push a safety pin through the wire insulation as stated above. The voltage should be between 0-5 volts without any breaks throughout the range. If not, it's a bad TPS.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

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ddenton749
Gearhead

Posts: 487
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 02-15-2005 02:16 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
Sorry...I can't get this to work. I'll try to email it to you.


TPS Vehicle Harness Connector


***
* *
****************** *
* *
* - - - *
* *
********************

SIG TP
RET SIG VREF

Rectangular Plug


*
*
**********
* *
* SR TPSIG *
* *
* *
* VREF *
* *
* *
* *
***
*
*
Round Plug

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

[This message has been edited by ddenton749 (edited 02-15-2005).]

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Moneymaker
Administrator

Posts: 26513
From: Lyons, IL, USA
Registered: May 99

posted 02-15-2005 06:46 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
So if a car does not have A/C would it still have a WOT relay?
I think not.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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