Question about 2004 Ford Taurus

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How do I test idle air control to see if it is working

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I just replaced the idle air control on my 2004 Ford Taurus, and when I started the car, the engine is racing to almost 3000 RPM's what can I do? I unhooked the battery to see if the computer would reset, but nothing so I put the old one back on for now.

Posted on Jun 21, 2011

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By the throttle butterfly their is a steeper motor or a valve of some description but i think this vehicle has the standard one fitted and this has four wirs running to the plug ,two wires are earth and two are the feeds ,so to increase idle current is applied to one pair of wires and to lower ide current is applied to other two wires ,its a 12v feed which you should read as the idles goes up and the same on the other pair of wires when idle goes down the power runs a 12v DC motor which screws in or out ,you could run a bit of twin flex from battery and touch it to the connections to check its operation

Posted on Mar 18, 2011

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My 2000 new beetle dies when I turn the a/c on


I recommend you test the idle air control valve. See procedure below. If this is not the problem, please read additional possibilities at the link below.


Operation


The Idle Air Control (IAC) valve controls the amount of air that bypasses the throttle valve, which controls the engine idle speed. The IAC valve consists of windings, an armature, a return spring, and a rotary slide. The engine control module (ECM) pulses the voltage to the winding, the opposing forces on the armature by the return spring cause it to maintain a fixed position, adjusting the amount of bypass air to maintain the correct idle speed.

Removal & Installation


Turn the ignition switch to the OFF position.
Disconnect the idle air control valve harness electrical connector.
Using a suitable tool, remove idle air control valve.
Installation is in reverse order of removal.

Testing


Checking Idle Air Control Valve (IAC) Triggering
Check IAC valve is electrically OK.
Slide up boot on the IAC valve connector.
0900c152801c00a1-nx20irngy4ugyvyt2uth3oj4-3-0.gif

Fig. IAC Connector
Use scan tool 'Output Diagnostic Test Mode' function 03 to trigger the IAC valve - N71.Connect VAG 1527B voltage tester, or equivalent, between terminal 1 and engine ground (GND). Voltage tester must flash.Connect VAG 1527B voltage tester, or equivalent, between terminal 2 and battery positive voltage (B+). Voltage tester must light up.If specified results are not obtained:Connect VAG 1598/19 test box, or equivalent, to ECM harness connector.Check the wiring between harness and connector terminal 1 (in engine compartment) to test box socket D11 . Then check the wiring between harness connector terminal 2 and test box socketD9 using wiring diagram. Repair as necessary.If the wiring is okay, but triggering still does not occur, replace the ECM.If the triggering signal and the wiring are okay and the valve does not react, replace the IAC valve. Checking Mechanical Function
Remove the idle air control (IAC) valve.Visually check the surface of the rotary slide (arrow) for signs of wear.



0900c152801c00a2-nx20irngy4ugyvyt2uth3oj4-3-4.gif
Fig. Showing the IAC Valve

WARNING
Do NOT check for ease of movement by prying on the rotary slide with a screwdriver or other tools that could cause scratching or other damage.

Reconnect the IAC valve, while still removed, to the harness connector.Use scan tool 'Output Diagnostic Test Mode' function 03 to trigger IAC valve - N71.Check whether rotary slide moves freely from stop to stop.If there are signs of scoring, or if the rotary slide does not move freely in both directions, replace the IAC valve.If the IAC valve does not respond (not triggered) during the Output Diagnostic Test Mode, check triggering. Resistance Test
Remove the idle air control valve harness connector.Use a suitable Digital Multimeter (DMM) to measure the resistance between the 2 terminals of the idle air control valve.The correct measurement should be 7-11 ohms. If not, replace the idle air control valve.
NOTE
At room temperature, the resistance value will be lower. The resistance value will be higher if the Idle Air Control (IAC) valve is measured at under-hood operating temperatures.

Reconnect the idle air control valve harness connector.The idle air control valve should hum and vibrate slightly when the ignition is turned 'ON'. If not, the ECM or harness may be defective.

Do It Yourself Diagnosis and Repair

Aug 03, 2017 | Cars & Trucks

1 Answer

Code p0506 on a 03 grandmarquis battery light comes on and stalls.


Does yours have electronic throttle control ?
P0506 - Idle Air Control System RPM Lower Than Expected (Electronic Throttle Control [ETC] Vehicles) The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.
  • Air intake restriction
  • Exhaust restriction
  • Engine mechanical fault
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air or vacuum leaks and damage. If no concerns are present, clear the DTC and retest. P0506 - Idle Air Control System RPM Lower Than Expected (All Others) The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.
  • IAC circuit shorted to PWR
  • VPWR to IAC solenoid open
  • IAC circuit open
  • Damaged IAC valve
  • Damaged PCM
  • Air inlet is plugged
The IAC solenoid resistance is from 6 to 13 ohms. Monitor IAC PID duty cycle and/or voltage.

Jun 21, 2015 | Cars & Trucks

1 Answer

MY 85 928 won't hold an idle. I thought it was the air idle control valve but found the car had a Bosch 'Air Slide' instead. This was bench tested and is working......is there also an air idle control...


Not sure, but have you checked ALL of your vacuum lines for cracks/leaks - most likely cause is an air leak in vacuum lines or fuel inlet.

Mar 27, 2014 | 1985 Porsche 928

1 Answer

1992 oldsmobile 88 royale. Two issues here that I haven't been able to nail down. The first is my heater only comes out of the defrost vents and floor vents, but I have checked all of the vacuum lines...


Check to make sure your idle air control valve is working and the passage thru the throttle body is clear. Instructions for testing are at the link below. Repair Guides Electronic Engine Controls Idle Air Control Valve AutoZone... if the iac is good, you might want to test the map sensor.
For the vents, are you saying all of the vacuum actuators are working? The mode switch simply transfers vacuum to the different door actuators. If all doors are working, the problem must be the control valve in the panel. Autozone.com also has the procedure for removing the panel at
Repair Guides Heating And Air Conditioning Control Cables AutoZone com

Jul 16, 2017 | Cars & Trucks

1 Answer

How do I change idle speed on a 1989 S-15 Jimmy w/4.3


computer controls engine idle thru a idle air control valve, air control valve could be dirty or bad, recomend to clean valve and clean throttle body bore with cleaner and see if idle inproves

Sep 03, 2012 | 1989 GMC S-15 Jimmy

1 Answer

High idle after engine is warm. nothing is sticking with linkage.1992 chev k1500 5.7


Make sure the idle screw was not turnned causeing tps sensor to read over the spec limit, the next then is to make sure the idle air control valve is working , a bad valve will cause this problem and last is the stepper motor that controls the idle. some of these around this year used steeper idle control motors instead of idle air control valves and in turn the stepper motor is bad it will hold the throtle plate open to much causing the tps reading to be wrong triggering the engine light to come on. the steeper motor will be boltted to side of the throtlebody and theres a small arm to the throtle linkage. i will enclose a stepper motor picture and an idle air valve to show you, but this sounds like the tps is out of range due to this. the last thing is to make sure there are no vacuum leaks, spray crab cleaner around throtlebody base gasket and also the intake mounting gasket and see if the idle changes is so theres a vac leak in that area. good day. okay just did a little research and this truck does have a idle air control valve, the picture is encolsed and is screwed into throtlebody, check that and for vacuum leaks, make sure tps is good sometime it will test good when testing and go bad when it wants, you could have a bad tps and idle air control valve also.11_27_2011_9_27_54_pm.jpg

Nov 24, 2011 | 1992 Chevrolet K1500

1 Answer

When i turn on the ac the idle goes low and the the car vibrates. When i turn off the ac the car stop vibrating.



Operation

The Idle Air Control (IAC) valve controls the amount of air that bypasses the throttle valve, which controls the engine idle speed. The IAC valve consists of windings, an armature, a return spring, and a rotary slide. The engine control module (ECM) pulses the voltage to the winding, the opposing forces on the armature by the return spring cause it to maintain a fixed position, adjusting the amount of bypass air to maintain the correct idle speed.


Removal & Installation

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the idle air control valve harness electrical connector.
  3. Using a suitable tool, remove idle air control valve.
  4. Installation is in reverse order of removal.


Testing

Checking Idle Air Control Valve (IAC) Triggering

  1. Check IAC valve is electrically OK.
  2. Slide up boot on the IAC valve connector.



0900c152801c00a1.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. IAC Connector

  1. Use scan tool 'Output Diagnostic Test Mode' function 03 to trigger the IAC valve - N71.
  2. Connect VAG 1527B voltage tester, or equivalent, between terminal 1 and engine ground (GND). Voltage tester must flash.
  3. Connect VAG 1527B voltage tester, or equivalent, between terminal 2 and battery positive voltage (B+). Voltage tester must light up.
  4. If specified results are not obtained:
    1. Connect VAG 1598/19 test box, or equivalent, to ECM harness connector.
    2. Check the wiring between harness and connector terminal 1 (in engine compartment) to test box socket D11 . Then check the wiring between harness connector terminal 2 and test box socket D9 using wiring diagram. Repair as necessary.
    3. If the wiring is okay, but triggering still does not occur, replace the ECM.
    4. If the triggering signal and the wiring are okay and the valve does not react, replace the IAC valve.


Checking Mechanical Function
  1. Remove the idle air control (IAC) valve.
  2. Visually check the surface of the rotary slide (arrow) for signs of wear.



0900c152801c00a2.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Showing the IAC Valve

WARNING Do NOT check for ease of movement by prying on the rotary slide with a screwdriver or other tools that could cause scratching or other damage.

  1. Reconnect the IAC valve, while still removed, to the harness connector.
  2. Use scan tool 'Output Diagnostic Test Mode' function 03 to trigger IAC valve - N71.
  3. Check whether rotary slide moves freely from stop to stop.
  4. If there are signs of scoring, or if the rotary slide does not move freely in both directions, replace the IAC valve.
  5. If the IAC valve does not respond (not triggered) during the Output Diagnostic Test Mode, check triggering.

Resistance Test
  1. Remove the idle air control valve harness connector.
  2. Use a suitable Digital Multimeter (DMM) to measure the resistance between the 2 terminals of the idle air control valve.
  3. The correct measurement should be 7-11 ohms. If not, replace the idle air control valve.


NOTE At room temperature, the resistance value will be lower. The resistance value will be higher if the Idle Air Control (IAC) valve is measured at under-hood operating temperatures.
  1. Reconnect the idle air control valve harness connector.
  2. The idle air control valve should hum and vibrate slightly when the ignition is turned 'ON'. If not, the ECM or harness may be defective.

Testing with VAG1551:
  1. Remove the idle air control valve harness connector.
  2. Connect the VAG 15278 LED tester to terminals 1 and 2 of the harness connector using the jumpers from VW 1594 adaptor kit.
  3. Turn ignition ON, perform steps from output DTM (Diagnostic Test Mode) to activate the IAC valve (N71) LED tester must blink.
  4. If tester does not blink, check wiring using VAG 1598 pin out box, electrical checks, step 26. Repair as necessary.
  5. If wiring is okay, replace the ECM.
  6. If LED tester blinks but the IAC valve does not operate, replace the IAC valve.

Feb 15, 2011 | 2000 Volkswagen Jetta TDI

2 Answers

My taurus will not crank unless i pour gas into the air intake then it shuts off 2 seconds later the fuel pump is working what could my problem be


Possibly an your IAC (Idle Air Control valve) This is my opinion take it at face value.

There are slight differences between the 3.0 liter and 3.8 liter.

http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?categoryDisplayName=Engine+Management&fromType=parts&fromString=search&parentId=59-0&currentPage=1&filterByKeyWord=idle+air+control+valve&isSearchByPartNumber=false&navValue=15900207&categoryNValue=15999999&fromWhere=&itemId=207-0&displayName=Idle+Air+Control+Valve&searchText=idle+air+control+valve&_requestid=1189218

Feb 17, 2010 | 1992 Ford Taurus

3 Answers

93 Buick Skylark is idling really high. New computer was installed, new throttle control sensor, and idle air sensor. It is still idling too high. Throttle control was cleaned and it is still idling high....


Idling high in the skylark could be something to do with throttle control, or idle air control valve, other possibilities could be a vacuum leak or mass air flow sensor, it could also be a faulty system recently replaced. When you vehicle idles high it means it is getting more fuel than its suppose to in the fuel/air mixture, most times to much fuel in the mixture is caused by a leak or malfunction in the air delivery not allowing the appropriate amount of air in.

Aug 28, 2009 | 1993 Buick Skylark

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