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  • Injector Feedback Values Mystery

    I have read elsewhere on this site the merits of acquiring Techstream for the purpose on real-time engine diagnosis. In relation to Injector Feedback Values both cold and warm states, whilst interesting the values quoted in examples are meaningless to me. I have read elsewhere that, in terms of these values that Toyota allows for a maximum of 3.0 whilst Denso recommends a maximum of 2.0. In addition examples on this site show both negative and positive values in the range -1.0 through 3.2, and I'm sure other ranges are typical. Can anyone throw light on what these values are a measure of and if the 2.0 and 3.0 maximums quoted here range from -2.0 to 2.0 and -3.0 to 3.0 for the purpose of compliance assessment? Cheers, Gerundivus.

  • #2
    Originally posted by Gerundivus View Post
    I have read elsewhere on this site the merits of acquiring Techstream for the purpose on real-time engine diagnosis. In relation to Injector Feedback Values both cold and warm states, whilst interesting the values quoted in examples are meaningless to me. I have read elsewhere that, in terms of these values that Toyota allows for a maximum of 3.0 whilst Denso recommends a maximum of 2.0. In addition examples on this site show both negative and positive values in the range -1.0 through 3.2, and I'm sure other ranges are typical. Can anyone throw light on what these values are a measure of and if the 2.0 and 3.0 maximums quoted here range from -2.0 to 2.0 and -3.0 to 3.0 for the purpose of compliance assessment? Cheers, Gerundivus.
    Not sure where you get DENSO having different spec to Toyota, that b incorrect.

    + or - 3 is the limit.
    This work is a specialist area, there a lot More to it than individual feedbacks.
    I don't like 2's, because they stay good for such a long time & good is best, 2 is very average.
    Specs are only for hot, so it will take a seasoned professional that has diagnosed hundreds to know what cold specs are ok. Cold many of the readings will be out. It depends how fast they come back.

    Only use new injectors.

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    • #3
      Hi ####,

      What specifically does the +-3 equate to? Is this a percentage, ratio or something else and how and what is it measuring? Sorry for the questions but kinda insterested.

      Thanks
      Doug
      2018 150 Series Crystal Pearl Prado VX 2.8l. 2 inch King springs and Bilstein shocks, Airtek TJM snorkel.

      Comment


      • #4
        according to the diagnostic manual, units for the feedback values are mm3, so volume of fuel. The description is

        quote
        Value of injector fuel injection volume compensates for differences in combustion condition of the cylinders.
        - Positive values indicate control which corrects combustion degradation
        - Negative values indicate control which corrects excessive combustion pressure
        - If problem exists, revised injection volume may deviate from -3.0 mm and 3.0 mm range
        /quote

        Comment


        • #5
          Originally posted by Anth120playdo View Post
          I don't like 2's, because they stay good for such a long time & good is best, 2 is very average.

          .
          Thanks for feedback ####. Sorry but don't understand your dislike of 2's for staying good when good is best? The Toyota Denso variation was picked up from another forum (member claim) - his source not quoted/validated. Cheers Gerundivus.

          Comment


          • #6
            Thanks for feedback Brodad I now have clearer understanding of the data - it would seem that values outside the -3.0 and 3.0 range are cause for suspicion and referral to mechanic. I have seen a Feedback Values table that included "mm3" column but hadn't realised at the time this metric realtes to volume. V.helpful, thank you. Gerundivus.

            Comment


            • #7
              Just on Anths point, i think he is saying that they stay under 2 for a long time, and when they get above 2 then its cause for concern as there's every chance they will jump above 3 at short notice. This then put the engine at risk of damage.

              Comment


              • #8
                Originally posted by Brodad View Post
                Just on Anths point, i think he is saying that they stay under 2 for a long time, and when they get above 2 then its cause for concern as there's every chance they will jump above 3 at short notice. This then put the engine at risk of damage.
                Good work, correct.

                Comment


                • #9
                  Originally posted by Gerundivus View Post
                  Thanks for feedback Brodad I now have clearer understanding of the data - it would seem that values outside the -3.0 and 3.0 range are cause for suspicion and referral to mechanic. I have seen a Feedback Values table that included "mm3" column but hadn't realised at the time this metric realtes to volume. V.helpful, thank you. Gerundivus.
                  Outside of + or -3 is time to replace them

                  Comment


                  • #10
                    Thanks for further feedback ####, understood. Cheers Gerundivus.

                    Comment

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