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P0401 solution

Discussion in '80-Series Tech' started by Gumby, Dec 12, 2003.

  1. Gumby

    Gumby Supamod Staff Member s-Moderator

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    I spent the day at a seminar for auto shop teachers today. One of the sessions was on monitor actuation for all manufacturers. Of course, all I was interested in was the Toyota content, specifically the EGR monitor on the LCs.

    This is what it takes for the PCM to look at the EGR info, also known as the ERG monitor Drive Trace for all models 96-2002

    Pre-Conditioning Requirements
    MIL must be off
    Altitude is below 7801 feet (2400 m)
    IAT (Intake Air Temp) must be above 13*F (-10*C)
    1996-2000 LC/LX 450 Engine Coolant Temp must be below 104*F (40* c)

    Driving Procedure
    Drive vehicle at a steady speed between 43 and 56 mph for three to five minutes
    Do not exceed 30% throttle opening
    maintain smooth throttle inputs
    Stop the vehicle and idle the engine for 3-5 minutes
    Rinse and repeat

    The monitor will store a pending code the first time it fails. The second time it will light the MIL

    So all you have to do to never have a P0401 is to never drive between 43 and 56 longer than 3 minutes below 30% throttle opening. No problem.

    All hail Gumby, solver of the impossible.
     
  2. Junk

    Junk

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  3. Junk

    Junk

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    :flipoff2:Surprised you just didn't say to unplug the light. :flipoff2:
     
  4. landtoy80

    landtoy80

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    Or buy a 94 or older 80
     
  5. Beowulf

    Beowulf

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    Or move to Santa Fe, NM. I believe they're at 8,000'+
    -B-
     
  6. landtoy80

    landtoy80

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    [quote author=Beowulf link=board=2;threadid=8737;start=msg75280#msg75280 date=1071294788]
    Or move to Santa Fe, NM. I believe they're at 8,000'+
    -B-

    [/quote]
    I like that idea beter. It was -8f out yesterday morning :doh:
    Do they grow creanberries down there?
     
  7. DanKunz

    DanKunz SILVER Star

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    91 never had this problem....


    3FE POWA!
     
  8. Beowulf

    Beowulf

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    Kurt,
    I just checked their web site and it says they are at 7,000' so that could be a problem.

    They call themselves "The City Different" so they probably grow lots of weird things. I've never heard of creanberries but if they're grown anywhere in the state of New Mexico then they probably grow them in Santa Fe. You and Shirley McClain should get along real well. :D

    -B-
     
  9. landtoy80

    landtoy80

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    Even without cranberries, I will still move to NM as I am "weird and different" and would fit right in.
     
  10. semlin

    semlin discouraged user

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    [quote author=DanKunz link=board=2;threadid=8737;start=msg75358#msg75358 date=1071330616]
    91 never had this problem....[/quote]

    not to mention your federalized 93 with no temp sensor to trigger a code! (Can't believe I'm teaming up witht he 3fE's :cheers:)

    All joking aside, a number of historic posts suggest no problem with running with the 401/71 code problem. Scamper's recent post about EGT has me wondering whether the higher EGT might fry your cats.

    No fried cat jokes please.
     
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