1997 F350 with all the symptoms of the Idle Validation Switch intermittent, and now completely quit. I got a new assembly no change to symptoms. The old one works in another truck, as well as the new one. When intermittent the IVS causes the symptoms, could the wires be loose at the other end from the IVS? Does anybody have a diagram or know where the other end is?

thanks

 

****** http-equiv="Content-Type" content="text/html; charset=utf-8">****** name="ProgId" content="Word.Document">****** name="Generator" content="Microsoft Word 10">****** name="Originator" content="Microsoft Word 10"><link rel="File-List" href="file:///C:%5CDOCUME%7E1%5CLINDAC%7E1%5CLOCALS%7E1%5CTemp%5 Cmsohtml1%5C01%5Cclip_filelist.xml"><link rel="Edit-Time-Data" href="file:///C:%5CDOCUME%7E1%5CLINDAC%7E1%5CLOCALS%7E1%5CTemp%5 Cmsohtml1%5C01%5Cclip_editdata.mso"><!--[if !mso]> <style> v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style> <![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><style> <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0in; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;} div.Section1 {page:Section1;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} </style> <![endif]--> Crap, the schematic didn't copy. PM me your E-mail address and I'll get it to you Pronto.

Rog







AP/IVS Pedal Position Sensor/Idle Validation Switch





Signal Functions

The Accelerator Pedal Position Sensor (AP) is a potentiometer type sensor which, when supplied with a 5 volt reference signal from the Powertrain Control Module (PCM), provides a linear analog voltage signal that indicates the driver's demand for power.

The Idle Validation Switch (IVS) is a 0/12 volt switch that provides the PCM with a redundant signal to verify when the pedal is in the idle position.

Fuel Quantity and Timing Control

The AP signal is used in calculating desired fuel quantity and injector timing.

Injection Control Pressure

Accelerator pedal position is one of the controlling variables in the calculation of desired injection control pressure.

Fault Detection/Management

Any detected malfunction of the AP or IVS sensor circuit will illuminate the CHECK ENGINE lamp.

An AP signal that is detected out of range high or low by the PCM will cause the engine to ignore the AP signal and will only allow the engine to operate at low idle only.

If a disagreement in the state if IVS and AP if detected by the PCM and the PCM can not discern if it is an AP or IVS fault or if it is and AP fault, the engine will be allowed to operate at low idle only.





Connector Checks to Ground (B-) (Check with Sensor Connector Disconnected and Ignition Key Off, All Accessories Off) Test Points Spec. Comments
1 to Grd. < 5 ohms Resistance to Grd. (B-) check w/key off, > than 5 ohms harness is open. -AP sig. Grd.
2 to Grd. >1000 ohms Resistance less than 1000 ohms indicates a short to ground. -AP signal
3 to Grd. >1000 ohms Resistance less than 1000 ohms indicates a short to ground. -AP VRef
A to Grd. >1000 ohms Resistance less than 1000 ohms indicates a short to ground. -IVS signal



Connector Voltage Checks (Check with Sensor Connector Disconnected and Ignition Key On) Test Points Spec. Comments
1 to Grd. 0 - .25 volts Signal ground no voltage expected.
2 to Grd. 0 - .25 volts If greater than .25 volts signal circuit is shorted to Vref or battery. -AP signal
3 to Grd. 5 ± .5 volts VRef check key on, if VRef not present check open/short to Grd #91 to B, see VRef circuit.
A to Grd. 0-.25 volts If greater than .25 volts signal circuit ground wire is shorted to Vref or battery.
B to Grd. 12 ± 1.5 volts <10.5v check for poor connection, 0 v check for open/short to Grd circuit or blown fuse.



Harness Resistance Checks (Check with breakout box installed on engine harness only) Test Points Spec. Comments
#91 to 1 < 5 ohms Resistance from 104 pin connector to harness connector - Signal Ground
#89 to 2 < 5 ohms Resistance from 104 pin connector to harness connector - AP Signal
#90 to 3 < 5 ohms Resistance from 104 pin connector to harness connector - VRef
#5 to A < 5 ohms Resistance from 104 pin connector to harness connector - IVS Signal
V IGN. to B < 5 ohms Resistance from V IGN, power to harness connector



Operational Voltage Checks (Check with breakout box installed key "ON") Position AP Test Points (+) #89 to (-) #91 IVS Test Points (+) #5 to (-) #91 Comments
Voltage
Low Idle .37 to 1.4 V < .25 volts Minimum IVS transition point .2 volts above base idle voltage.
High Idle 3 to 4.5 V 12 ± 1.5 volts Maximum IVS transition point @ 1.6v of AP signal



Diagnostic Trouble Code Descriptions
0122 AP signal was less than 0.37 volts for more than 0.5 seconds*
0123 AP signal was greater than 4.56 volts for more than 0.5seconds*
0221 AP and IVS disagree
0220 PCM did not receive IVS transition


* IF FAULT CODE IS SET, ENGINE OPERATION WILL DEFAULT TO RUN AT LOW IDLE SPEED ONLY
<o> </o>
<table class="MsoNormalTable" style="width: 100%;" width="100%" border="0" cellpadding="0" cellspacing="6"> <tbody><tr style=""> <td style="padding: 0in; width: 11.74%;" width="11%" nowrap="nowrap"> <o> </o>
</td> <td style="padding: 0in; width: 61.88%;" width="61%">
</td> <td style="padding: 0in;" valign="top" nowrap="nowrap"> <o> </o>
</td> </tr> </tbody></table> <o> </o>
<table class="MsoNormalTable" style="width: 100%;" width="100%" border="0" cellpadding="0"> <tbody><tr style=""> <td style="padding: 0.75pt;" valign="top"> <!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" oreferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> <v:stroke joinstyle="miter"/> <v:formulas> <v:f eqn="if lineDrawn pixelLineWidth 0"/> <v:f eqn="sum @0 1 0"/> <v:f eqn="sum 0 0 @1"/> <v:f eqn="prod @2 1 2"/> <v:f eqn="prod @3 21600 pixelWidth"/> <v:f eqn="prod @3 21600 pixelHeight"/> <v:f eqn="sum @0 0 1"/> <v:f eqn="prod @6 1 2"/> <v:f eqn="prod @7 21600 pixelWidth"/> <v:f eqn="sum @8 21600 0"/> <v:f eqn="prod @7 21600 pixelHeight"/> <v:f eqn="sum @10 21600 0"/> </v:formulas> <vath o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> <o:lock v:ext="edit" aspectratio="t"/> </v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" alt="" style='width:390pt; height:173.25pt'> <v:imagedata src="file:///C:\DOCUME~1\LINDAC~1\LOCALS~1\Temp\msohtml1\01\cli p_image001.gif" o:href="https://www.ford-trucks.com/user_gallery/sizeimage.php?photoid=190583&.jpg="/> </v:shape><![endif]--><!--[if !vml]-->[IMG]file:///C:/DOCUME%7E1/LINDAC%7E1/LOCALS%7E1/Temp/msohtml1/01/clip_image001.gif[/IMG]<!--[endif]-->
</td> </tr> </tbody></table> <o> </o>

 

went through the test, the ign source voltage that should be 12 +- is verry erattic hence the erratic operation of the pedal, now we are chasing down the loose connection, reps to you kawa excellent product thanks for the help

 

You are quite welcome, Just glad to help.

Rog