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mdm545

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Posts posted by mdm545

    Bad Throttle Position Sensor???

    in Fourth Generation Legacy (2005 - 2009)

    Posted

    My 2005 legacygt TPS sensor was having issues. I could be on the highway (cuise control) and the car would go into limp home mode and throw a CEL. Or, I would be in city traffic, the rpms would surge, eventually throwing a CEL and go into limp home mode. These events only occurred in cold weather months.

     

    Solution: I cleaned both the accelerator pedal sensor and throttle body sensor with electrical contact cleaner. I think the brand was CNC, purchased via Homeboy Depot. I then noticed that the TMIC had light oil residue throughout, as well as a small accumulation/puddle in front of the throttle body. So I removed and cleaned the TMIC and Throttle body with throttle body cleaner. Not sure which one of these solved the issue, most likely the sensor contacts being cleaned. But the issue has not returned for a few months now.

     

     

     

    Summary:

    • Engine rpms surge, check engine light, limp home mode
    • clean accelator pedal/throttle body sensor contacts with electrical contact cleaner
    • (if oil residue in TMIC/throttlr body butterfly valve) clean with throttle body cleaner

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