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ECU/ECM not communicating w/ OBDII testers

Discussion in 'Technical Chat' started by Armchair, Jan 30, 2010.

  1. Jan 30, 2010 at 1:22 PM
    #1
    Armchair

    Armchair [OP] New Member

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    Tacoma V6
    2001 V6 Double Cab
    My ECU is not communicating when plugging into a OBDII scanner. It worked in 2004 at the emissions test station. Then in 2006 the emissions test station at 2 different locations could not read the ECU. I wiggled around that year and in 2008 the emissions could not read it again. I borrowed a ODBII scanner and could not communicate as well. I took it to a mechanic in 2008, and was suggested to replace the ECM, but never have. I found a diagram of the plug, but have not attempted to troubleshoot yet.
    [​IMG]
    http://www.markofshame.com/fsm/03_Tacoma/Repair_Manual/03tacoma/di/eg5vzfe/preche.pdf

    I just had the timing belt replaced at 126,000 miles and they still could not read it. The truck is running well.

    Any common causes for not communicating?
     
  2. Jan 31, 2010 at 3:50 PM
    #2
    kevhogaz

    kevhogaz Low Speed, High Drag

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    Queen Creek, Arizona
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    SR5 PreRunner
    3" lift front & rear, Air Raid Intake System
    I see that problem on Euro-trash cars all the time, but never on a Toyota. I'd pull the connector down, and check for loose/broken wires within the housing.
     
  3. Mar 6, 2014 at 4:59 PM
    #3
    Crowe

    Crowe New Member

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    01 Tacoma Scharged URD 7th inj kit, shift kit
    3"body lift cd 2 12" subs 2ndgen TRD charger URD 7th injector kit
    i have same problem didiu fix it
     
  4. Mar 6, 2014 at 5:04 PM
    #4
    Evenflow

    Evenflow Well-Known Member

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    San Diego, CA
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    Yes
    There is an OBD fuse in the truck in a Gen2 it is under the hood, when the fuse is blown the port has no power and the port powers the scanner. Just replace the fuse and you are go to go... Just happened to me a few months ago too.

    I did read that the power wire to the port can get broken which is also an easy fix if it still doesn't work after checking fuse simply #16 behind the plug and re run 12v power to it yourself.
     
  5. Mar 6, 2014 at 5:55 PM
    #5
    gearcruncher

    gearcruncher Well-Known Member

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