Does techstream let you override fuel trims?

Discussion in 'Gen 2 Prius Technical Discussion' started by Hello1024, Feb 4, 2026 at 11:22 AM.

  1. Hello1024

    Hello1024 Junior Member

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    Can I force rich/lean combustion for testing?

    If so, anyone know what OBD messages to send?
     
    #1 Hello1024, Feb 4, 2026 at 11:22 AM
  2. Tombukt2

    Tombukt2 Senior Member

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    You're going to need an ATS scope or something. you want to play with things . That's tuning . Scopes analyzers etc FNSRI mite be a good place to look. Unless you want to buy the real high quality expensive stuff
     
    #2 Tombukt2, Feb 4, 2026 at 1:02 PM
  3. ChapmanF

    ChapmanF Senior Member

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    For gen 3 at least (and I'd assume for gen 2), Techstream indeed has an active test for driving injector timing to some percent extra rich or extra lean. There are some troubleshooting procedures in the repair manual that instruct you to do that.

    Other scan tools that license the test info from Toyota should have that test too, but under agreement not to disclose the exact OBD messages involved.
     
    #3 ChapmanF, Feb 4, 2026 at 3:42 PM
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