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Idle Ctrl System Malfunction DTC Code - what is this? 850 1997

posted by  LisaS on  Thu Dec 22 08:23 CST 2005
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We are trying to smog our 1997 Volvo 850glt Wagon and there is an air code coming up on the OBDII results. It is error P0505 which is "Idle Ctrl System Malfunction". Our Volvo tech is on vacation until after the Holidays. The car is running great. Is this something we can fix ourselves? Thanks!!!








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    Idle Ctrl System Malfunction DTC Code - what is this? 850 1997

    posted by  V70BB on  Thu Dec 22 11:04 CST 2005
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    take the cover off the throttle body, and you should find a valve like item called the IAC (Idle Control Valve). There is an electrical connection on one end, and two hoses attached to it also. Try unplugging the IAC and plugging it back in, and then clear the codes and see if it comes back.

    Alternately, remove the IAC and clean it with throttle body cleaner (cover the electrical portion tight), and a bristle brush like an old firm toothbrush. Once you've done that, reinstall, clear code, and see if it returns.

    Could be a faulty IAC that may not respond to either of these suggestions, in which case you will be looking at approx $160 US for a replacement plus any applicable labor, if you don't plan on doing it yourself.

    BB
    --
    1998 V 70 BASE







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