Author
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Topic: What is WOT relay
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mustang90LX50 Journeyman Posts: 15 From: Chesapeake, VA USA Registered: Dec 2004
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posted 02-10-2005 01:41 AM
what is WOT relay location in the engine compment
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Moneymaker Administrator Posts: 26513 From: Lyons, IL, USA Registered: May 99
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posted 02-10-2005 06:20 PM
TPS on the throttle body. TPS = throttle positioning sensor.------------------ 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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Tom G Gearhead Posts: 616 From: Bethlehem, Pa USA Registered: Nov 2001
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posted 02-12-2005 02:25 PM
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. ------------------ 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
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posted 02-12-2005 07:05 PM
WOT=Wide Open ThrottleThe 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. ------------------ '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
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posted 02-14-2005 11:12 PM
whats the orange wire for on the TPS?
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ddenton749 Gearhead Posts: 487 From: Kennett Square, PA, USA Registered: Apr 2004
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posted 02-15-2005 01:51 PM
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
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posted 02-15-2005 02:16 PM
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
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posted 02-15-2005 06:46 PM
So if a car does not have A/C would it still have a WOT relay? I think not. ------------------ 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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