Question about 2002 Toyota ECHO

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How can I to change or regulate the RPMs in my toyota echo 2001. After a clean in the iac valve the RPMs of engine were changed in idle acceleration I hear that the engine is more accelerate that before of the clean in the iac valve. Can you help me please?.

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Idle is controlled through the on board computer and is not adjustable, however after u cleaned the system you need to disconnect the battery for 5 minutes and then let the system relearn the idle speed, this takes about 30 miles of driving a combination of city and highway.

Posted on May 07, 2009

  • danila gheorghe Mar 17, 2011

    I have the same problem and a Renault Clio in 2004 and is Siemens VDO

  • danila gheorghe Mar 17, 2011

    I have the same problem and a Renault Clio in 2004 and is Siemens VDO

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1 Answer

Where is the air control sensor in a 2001 oldsmobile silhouette?


It's called IAC - idle air control valve > Did the RPM'S stay at 2000 or drop back down ? The PCM engine computer controls IAC valve according to engine load . Put it in gear , turn on electrical loads , headlamps , A/C etc... an the RPM raise's up so engine will not stall . More then likely the throttle plate needs to be cleaned , they get gummed up an stick at higher idle . Quick Tip Throttle Cleaning EricTheCarGuy If the IAC valve were gummed up the idle would be low or erratic . On some engines a vacuum leak will cause high idle . Videos on youtube checking for vacuum leaks .

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After cleaning the throttle body it looks to be stuck and RPM remain above 2000 when idling. Engine accelerates and decelerates going back to idling at about or above 2000 RPM.


When you cleaned the throttle body, did you remove the Idle Air Control valve/motor (IAC)? A dirty or defective IAC can be the result of your problems. The IOAC regulates your vehicles idling under various condictions. Try cleaning it first then replace if needed.

Please remeber to rate this solution. Thanks!

Feb 05, 2011 | 2002 Toyota Tacoma

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The car stops immediately after i turn on the AC


The problem might be with the Idle Air Control valve. This component is mounted on the throttle body and as its name implies it contols the engine idle speed anytime the accelerator is released.

One thing to try is to have the IAC valve removed and with a throttle body cleaner, clean the IAC valve and the idle air bleed port on the throttle body. If doing this shows no improvement with the idle, then the IAC valve may require replacement.

Jan 01, 2011 | 1998 Toyota Camry

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1990 4Runner, 3.0 L engine, won't hold idle, wants to stall, no power. Replaced Mass air flow valve sensor, replaced fuel pump, distributor cap and rotor, plugs. It has good fuel flow but only runs well...


Have you looked at your idle air control valve What is it? This is an electrically driven valve that allows additional control over the throttle at idle Where is it located? The IAC is located on or adjacent to the throttle body and consists of a small device held on by two bolts with an electrical connector.
How does it work? When the throttle is closed the throttle plate closes off any air from the intake manifold. In order to stop the engine from stalling due to lack of air the IAC opens a small valve allowing air to pass from the air ducting to the intake manifold. Often the IAC components consist of an air inlet port in the inside wall of the throttle body, immediately in front of the throttle plate, with a similar exit port behind the throttle plate. Connecting the two ports is a motor driven valve. When the valve is opened air effectively by-passes the closed throttle plate to maintain the engine at idle. The IAC also augments the throttle when additional power demands are put on the engine such as steering.


Symptoms of faulty IAC

  • Poor starting: If the IAC fails to open or the inlet/exit ports are clogged shut with carbon the engine may start and then promptly stall. The engine can be kept running by pressing the accelerator. However any additional demand on the engine such as power steering or putting the car into drive (automatic) will cause the engine to stumble badly and often stall.
  • Engine cut out: Even with the engine warmed when the vehicle is stationary such as at a red light the putting of the transmission into of 'drive' to pull away before the accelerator is pressed can cause the engine to stall. (Note this differs from the TPS fault which causes engine stall due to the accelerator being pressed too quickly)

How to check? Physically remove the IAC but keep the electrical connection to it. Temporarily block off the now open ports on the throttle, turn the engine on and examine the IAC valve action in response to additional loads (power steering inputs etc). The valve should open and close according to demand.

How to fix? If the motor of the IAC has failed then replace the IAC. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IAC look blocked again clean them out thoroughly.

Jun 03, 2010 | 1990 Toyota 4Runner

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1994 honda civic 1.5 16v stalling after pressing accelerator from idle


Another place to look is your IAC, or Idle air control valve. It is bolted to the back of the intake manifold, and can be removed and cleaned. It is usually the cause of most Honda Idle problems.

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2000 sienna stalls, loses power and engine sounds muffled when I accelerate. idles at only 500 rpm at stop sign and runs rough


After about 100K + miles the idle air control valve (IAC) begins to collect carbon deposits that interfere with the movement of the spring-loaded valve. You will not be able to clean this without removal and dissembly of the IAC body. Use an emory cloth or fine sandpaper to remove the build up around the valve. This should free it up to rotate without binding. This is a temporary fix, of course, and will either require cleaning again or replacement of the valve. Getting to the IAC requires removal of most of the intake upto, but not including, the intake manifold. Total time is approximately 3-4 hours, but worth it. Good luck, and I hope this helps.

Jun 25, 2009 | 2001 Toyota Sienna

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