Question about 1995 Nissan Maxima

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Idle air control valve needs replacing

The check engine light has been on my car for months. When I had it checked it was the idle air control valve. I need some detailed help on how to fix it!!!

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  • Anonymous Mar 26, 2014

    check engine light pops on car starts running a little rough slow got codes read at auto zone po507 430 420 300 they say 1 code may have triggered the rest any help



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If it is the IAC then buy one. once you know exactly what it looks like then it should be easy to see it connected to your throttle body. Look at the new one to find out where potential bolt holes are and now you know where they are on the car as well. If the check engine light is still on after you replace it try disconnecting your battery cables for a few minutes and it should reset your computer and turn the light off.

Posted on Jan 05, 2009

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Does my 2002 Chevy Impala have an idle speed control screw that I can raise my idle speed with

Well then you have a problem with the IAC - idle air control valve , air fuel mixture , mass air flow sensor , vacuum leak or some other problem with electronic fuel injection , OBD 2 ,emissions etc... There is an idle speed , minimal setting .Adjusting this will throw off the computer system , check engine light will come on an you won't be able get it to go out ! The PCM - engine computer controls the idle speed through the use of the IAC - motor or valve . Idle Air Control Valve You need to have it fix properly ! Check engine light on ?

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What is an IAC Valve

Google is your friend in such questions.

  • Idle air control actuator - Wikipedia, the free encyclopedia An idle air control actuator or idle air control valve (IAC actuator/valve) ... Idle air control actuator; MAP sensor; Mass flow sensor; Oxygen sensor; Starter motor;
  • how to tell if your iac valve is going bad - YouTube
    • BY TIMMY102345
    • 6 MIN
    2009-09-07 · Video embedded · how to tell if your iac valve is going bad timmy102345. ... #372 Better repair method Toyota Camry Idle Air Control Valve - ...
  • 4 Ways to Check an Idle Air Control Valve - wikiHow
    2015-12-11 · How to Check an Idle Air Control Valve. ... Again, an idle air control valve can have an issue or fault without triggering a check engine light. 2.

  • There are also videos in this link. How to check and fix.

  • What is an IAC Valve Bing video

    May 12, 2016 | 1992 Toyota Paseo

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    Iscv 33

    There is a digital stepper motor installed in the idle air control valve and it is operated by the ecm after taking all the outputs from various sensors.
    Check engine light error code 33. The idle air control valve circuit open or shorted to ground. There could be three possibilities which can trigger this code and the check engine light comes on.
    1. Check the wiring harness for open circuit or short to ground. Check the idle speed control valve connector for looseness,corrosion of poor contacts. Jiggle the harness at various places to find any damaged wire.
    2. Idle speed control valve defective. (replace. Merely replacing the electronic part of the valve can also solve the problem)
    3. ECM defective. (replace)

    Dec 12, 2013 | 1999 Toyota Corolla

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    My 1998 Jeep Cherokee Sport 6 cyl. acts like it wants to stall. I recently had a thermostat sensor replaced and that seemed to fix the problem. However two months later, the problem has returned. A

    I'm assuming you mean a coolant temp sensor. The sensor tells the computer what the coolant temp is.
    Normally when a sensor fails the check engine light comes on to warn the driver. Normally but not always.
    One thing that could affect both problems you describe is the idle air control valve. If the valve fails or sticks, the engine can stall or have a high idle speed. The computer controls idle speed by how much air is allowed into the throttle body.
    The throttle body could also be very dirty.

    Sep 16, 2012 | 1998 Jeep Cherokee

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    The idle is sticking on park

    High idle speed is usually caused by a sticking idle air control valve or a vac leak. The computer controls idle speed by how much air is allowed into the intake manifold.
    is the check engine light on ?

    Aug 26, 2012 | 1997 Chevrolet Tahoe

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    Lean idle air control valve

    Idle Air Control valves are not "LEAN" or "RICH". They can either control the idle speed correctly or they cannot. What kind of problem are you experiencing?

    Aug 30, 2011 | 2005 Chevrolet Equinox

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    2000 Mercury Mountaineer 5.0L engine. idle speed speeds up and slows down. Idles too fast.

    dirty or bad idle air control valve i would at worst the egr valve but most likely the idle air control valve which controls the air and idle from the throttle body try taking it out and cleaning the tip as well as in the throttle body where the control valve goes in if that dosent work replace it and the check engine light does not have to be on for it to be bad.good luck to you.

    10 year ford tech here.

    Aug 26, 2011 | 2000 Mercury Mountaineer

    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.


    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.


    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

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    2003 Subaru Outback check engine light stays on

    You may have to take it to a shop and have them connect their OBD tool to the computer and clear the deep memory. If you have a code left in the deep memory it can reapear like that. Good luck. Please rate me so I know how I'm doing. Thanks.

    Dec 30, 2008 | 2003 Subaru Outback

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