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Toyota Tundra No Start with No ECM Communication

Discussion in 'Tech Help' started by Lewis, Aug 9, 2017.

  1. Lewis

    Lewis Moderator Staff Member

    If you run across a 2008 Toyota Tundra (3UR-FE) and have a no start, no ECM communication condition and there is no "Check Engine Light" bulb illuminated during the function check, disconnect the secondary air valves.These have a tendency to short the 5 volt reference line and stop all ECM communication.
  2. Greg Turner

    Greg Turner Guest

    2007 Tundra 4.7 air injection check valve was the cause of no communication with scanner, no start. Thanks

    Lewis likes this.
  3. Lewis

    Lewis Moderator Staff Member

    That's why we're here Greg. Thanks for working on Toyota's.
  4. Jorge

    Jorge New Member

    Thank you so much
    Was having same issue
  5. Ulises

    Ulises New Member

    Having the same issue, only my 4 low light is blinking. Any ideas?
  6. Abhor

    Abhor New Member

    Having same issue. Truck died at a stop light as I took my foot off the break to drive away and the 4LO light started blinking. Engine turns over but won't start. No check engine light at all, even in the "ON" test position. Can not connect to ECU, even Toyota can't connect. It has been at the Toyota dealer for two week now and they still don't know what the issue is. They had a new ECU ready to install but they tech decided to test it first and it did not work either.
  7. Mark O

    Mark O Guest

    Having the same issue with my 2012 tundra. Any luck with the dealer resolving that issue.
  8. Abhor

    Abhor New Member

    No luck!!! Has been at the dealer this entire time. They are thinking they will need to replace the engine wiring harness.
  9. nap

    nap Guest

    Can we go ahead and diagnose the truck?
  10. Sherwin

    Sherwin Guest

    Is there a way to correct this without replacing the valve?
  11. Johann

    Johann Guest

    I replaced the secondary air valve and no problems for two months, yesterday my truck stalled while driving.
    The tech said he could not communicate with the ecc, so I assume I have the problem with the 5 volt reference, but since it is a new secondary valve, do yo think it is a defective valve ?

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