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Check Engine - Error 24
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Old 13 Jul 2010, 08:03 AM   #1 (permalink)
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Check Engine - Error 24

Hi!

I have a Subaru Impreza WRX -96 (Japan Import) and resonantly my check engine light turned on when I was driving (normal driving on the highway), when I pulled over the light turned off.

When I got home I checked the error code (thanks a lot for all good information on this forum to do this) and it is showing error code 24, which should be "Idle Control System Malfunction". But the engine is running smooth both idle and when driving.

It would be great if anyone could help me where to start searching for fault and finding the reason for the engine light to turn on. This have happened a few times now and it turns off as soon as I stop the car.

Kind regards,
Stefan
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Old 13 Jul 2010, 08:12 AM   #2 (permalink)
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Re: Check Engine - Error 24

Could be a problem with the Idle air control valve. Usually a problem with the IACV would cause a rough idle though. Gasket could be on it's way out and you could try giving it a good clean and see if that helps. Heres a link if you do give it a go;

Cleaning And Reattaching The IACV (Idle Air Control Valve) - NASIOC

If the car is running fine, you could try resetting the ECU and see if the fault code returns.
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Last edited by rikimaru; 13 Jul 2010 at 08:19 AM.
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Old 13 Jul 2010, 08:19 AM   #3 (permalink)
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Re: Check Engine - Error 24

thank you rikimaru, I will check this after work today.
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Old 13 Jul 2010, 08:43 AM   #4 (permalink)
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Re: Check Engine - Error 24

Hi the IACV may be on its way out, the ECU requires a voltage for it to recognise the signals 0.50v to 5v approx, if ur IACV is starting to fail ur ecu may be getting various voltages that it doesnt like while your driving, maybe this is ur hidden fault so to speak.
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