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Emissions "Cat Not Ready"

Discussion in '1st Gen. Tacomas (1995-2004)' started by blacktruck317, Oct 21, 2020.

  1. Oct 21, 2020 at 9:31 AM
    #1
    blacktruck317

    blacktruck317 [OP] Member

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    Joe
    Fairfield County,Connecticut
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    2004 doublecab
    Tuff Country 3" lift
    Need some help please. Have 2004 Double Cab 220,000 miles. Recently changed out battery and now can't seem to clear my "Cat not Ready". I have no check engine light, just seems cant get it from INC to the OK state. Try numerous starts and stop at 50 miles per hour and its been about 1000 miles and still not ready. I even followed the instructions on Toyota Tech Bulletin (EG003-02) for Readiness drive Patterns. Any suggestions? Very Frustrating
     
  2. Oct 21, 2020 at 9:33 AM
    #2
    T-yoda

    T-yoda Well-Known Member

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    Eastern pa
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    Don’t have any hints BUT cat monitor on your truck will take forever to set.... I try to let the truck idle for about 10 minutes then I would take it for a highway ride and keep it under 60mph ... maybe 15 miles one way and then back.... don’t know what else to tell you on this one
     
  3. Oct 21, 2020 at 9:37 AM
    #3
    T-yoda

    T-yoda Well-Known Member

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    Oh and that’s from a cold start....
     
  4. Oct 21, 2020 at 9:40 AM
    #4
    eon_blue

    eon_blue Unknown Member

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    Sometimes 100 miles isn't enough, I would jump on the highway for a bit like suggested above.
     
  5. Oct 21, 2020 at 1:24 PM
    #5
    Glamisman

    Glamisman Well-Known Member

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    many of the emmissions related drive cycles require that the fuel tank be between 1/4 and 3/4 full. In addition lots of them have to run the tests twice, it is referred to a 2 trip tests. It sounds like you have a OBDII scanner. If so see if it has Mode 6. Mode 6 is where all the data lives but the problem is with the consumer grade scanners mode 6 is usually in hexidecimal and and the PID's (individual test data) have to be researched. I have a large downhill grade on my test route and the cat monitor usually completes after a long closed throttle down hill run.
     
    Pickeledpigsfeet likes this.
  6. Oct 21, 2020 at 8:01 PM
    #6
    Diemaster

    Diemaster Active Member

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    T-yoda likes this.
  7. Oct 21, 2020 at 8:23 PM
    #7
    beez

    beez Well-Known Member

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    I had this same problem last year on my truck. I had used a bt obd sensor and cleared all the codes in the ecu.

    This caused a CEL and a "cat not ready" code.

    After first shop I took it too told me that I needed to drive around to reset the ecu, which didn't work, the second shop I took it too knew a trick to run it on a set of rollers in the right way, but I ended up needing new cats.
     
  8. Oct 23, 2020 at 12:42 AM
    #8
    Wyoming09

    Wyoming09 Well-Known Member

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    New Tripoli Pa
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    Super Springs
    For some reason the Cat test takes the longest to cycle .

    Like the OP I tried all the standard test cycles it just would not complete.

    It took close to 2500 miles to finally cycle so I could get a emission sticker .
     

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